Ffmpeg preserve alpha channel

5. -By default, bpgenc does not copy the metadata. 2005-10-05 Added Michael Brady's ydate patch. ER 1. 1 -y out. Convert Video in Adobe Media Encoder : Select this option if you want to convert the exported MOV file to a different format using AME. jpg) as well. static void sub2video_copy_rect ( uint8_t * dst , int dst_linesize , int w , int h , A channel layout specifies the spatial disposition of the channels in a multi-channel audio stream. V. Homebrew). 0:0. c libavcodec/bfi. Alpha channel. mapdemo from abcd1234_TCT_ALCATEL_one_touch_995 [INFO] abcd1234_TCT_ALCATEL_995 : Successfully installed /dev/foo/target/foo. Compile FFmpeg Alpha Channel Images & Embed FLV In Flash AS3 The battle with flash video alpha channels has resulted in victory. A value of 0 will disable the effect. FFmpeg is able to preserve transparency when using pixel format RGBA. The basic usage is shown below C++ Python The flags option is used to control how the image is read. Outputting to VP9 with alpha produces a clean result as does outputting to prores without alpha. 0 -map_channel 0. Single rendered images are not automatically saved to disk. Let’s look at some common examples. It has alpha channel. 0. For a description of all available FFmpeg filters, check the filters section of the documentation. c libavcodec/cyuv Likewise, don't use a full alpha channel if single-color transparency (à la GIF) would suffice; it doubles the size of grayscale images and adds 33% to the size of RGB. FFmpeg can be used to encode videos into difference formats. I may have missed a couple, so let me know in the comments. Three days of trying every angle to get alpha channels on the cheap and I broke down and downloaded a trial version of Sorenson Squeeze to compress the video in the proprietary VP6a (A for Alpha) codec. Timothy [Message part 2 (text/html, inline)] The fourth "4" in the name indicates this format's support for alpha (transparency) data, in contrast to ProRes 422. rename with shutil. 0 because of non-final bitstream The second input (fileB. 0 OUTPUT If you want to mute the first channel and keep the second: ffmpeg -i INPUT -map_channel -1 -map_channel 0. It also supports animations, but don’t get too excited over it, as we’ll show later. channel[:syncfile. A command to slip the video channel approximate 2 frames (0. png -r 10 blink. Default value is 'none'. FFmpeg is a video and audio converter that can also process live audio and video. This is because the alpha channel quality is very important. / ffplay. In a very rough sort of way, it is the QuickTime equivalent to -c:v ayuv, mentioned above. Individual channels are identified by an id, as given by the table below: ffmpeg -i INPUT -map_channel 0. flv commit fde85580b3424ca0af3e3f74c12881aeb446cf15 Author: Pedro Albuquerque <palbuquerque73 gmail com> Date: Thu Jul 23 07:44:46 2015 +0000 Updated Portuguese This will allow x264 to use lavf and friends from ffmpeg for decoding and demuxing while preventing a circular dependency between the two: x264 can depend on ffmpeg, but ffmpeg will depend on libx264 rather than x264. Default value is 0. Any guidance or help would be appreciated. You could also (if compression is less critical) use an image codec which supports alpha (e. mkv -acodec aac -ac 2 -strict experimental -ab 160k -s 1920x1080 -vcodec copy -f mp4 -threads 0 output. Thanks Telepoint and MediaHub for their support! September 29th, 2015, GSoC 2015 results. PNG) instead of a video codec (-c:v png) for the output. Merge commit '716d413c' * commit '716d413c': Replace PIX_FMT_* -> AV_PIX_FMT_*, PixelFormat -> AVPixelFormat Conflicts: doc/examples/muxing. cpp causing hang; Previously Recorded List: Fix 2 bugs FFmpeg fix: T53058 Crash when rendering to Quicktime RLE codec. Create PNG files with an alpha channel. bool. mp4 For some reason a lot of extra work is being done via your interface. avi file from ticket #159 […] 11:19 PM Ticket #632 (bmp 1bpp with palette decodes in negative) created by ami_stuff (issue 1421) […] 5:34 PM Ticket #63 (Purple bars appear when scaling a video with ffmpeg for windows) closed by cehoyos to 12 bits per image channel and up to 16 bits for the alpha channel. mp4. 5 or 1 also produces a clean result. 1 OUTPUT The order of the ``-map_channel'' option specifies the order of the channels in the output stream. - Add the LAVF option to the CLI port, making the dependency on ffmpeg optional. Targa Raw: uncompressed Targa. Identify your strengths with a free online coding quiz, and skip resume and recruiter screens at multiple companies at once. - Update to 0. ogg Note that currently each output stream can only contain channels from a single input stream; you can’t for example use "-map_channel" to pick multiple input audio channels contained in different streams (from the same or different files) and merge Sign in. 2005-10-10 Replaced all instances of os. Dec 21, 2016 · ffmpeg -i original_animation. Where WebP really shines is the compression at the lowest possible quality. mng Yesterday I checked the internet and tried dozens of combination of codecs, colour spaces and containers, including those known on the internet to preserve transparency on alpha channel. More configurations, like default output folder. " means you can decode but not encode using VP6. A channel layout specifies the spatial disposition of the channels in a multi-channel audio stream. Allowed ranges for options are [-2. png -c:v libx264rgb -qp 0 -preset veryslow rgb. List of video formats supporting alpha channels I had a request for this list, so here it is. Backend is Go/Ruby. ffmpeg -i input. If you want to mute the first channel and keep the second: ffmpeg -i INPUT -map_channel-1-map_channel 0. Add support for exporting to DNxHD Op-Atom MXF using Calibrated Tin Man exporter. GitHub Gist: instantly share code, notes, and snippets. Jul 14, 2010 · In some cases, a plus sign (as in Millions Of Colors+) denotes an alpha channel. ). This is the inverse of 'Copy'. It maintains high quality with a contained alpha channel, unlike H. V…. PNG supports palettes of 24-bit RGB colors, RGB images or greyscale or RGB images. . Read images matching the "*. If out_channel is not given then it is implicitly an index, starting with zero and increasing by one for each mapping. Preserve landscape geometry Compile FFmpeg Alpha Channel Images & Embed FLV In Flash AS3 The battle with flash video alpha channels has resulted in victory. 29. xxx]" syntax is also supported. Try specifying a different pixel format  28 Jul 2017 image sequences support alpha channel (exr, png, tiff) Code: ffmpeg -i input. ffmpeg -i stereo. In other cases, choosing to output to 32 bits per pixel implies the inclusion of the alpha channel; this refers to an output depth of 8 bits per channel for each of four channels: RGBA (where A is for alpha). g mp3) using ffmpeg ?? I usually enable this option under ffdshow audio processor while playing audio using MPC-HC Is it possible to do the same in howlerjs (a strong textjavascript audio library) ? ffmpeg -i INPUT -map_channel 0. Providing a value <100 downscales the image provided. move. output= Specify the output filename (default: out. 06. On a completely separate note, can your program (or ffmpeg alone) convert both m2v & ac3 files to MP4? Export a video with an alpha channels if such format is available in your video editing tool (e. It also includes a few image formats that are used for video work, like TIFF. mkv to . x (v56), remove support for outdated v52 + Video: improve LCF accuracy, add LCF render support + Video: improve video processors to allow colorspace override, alpha channel use in RGBA + Video: improve support for start timestamps as stream start when PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without alpha channel), and full-color non-palette-based RGB[A] images (with or without alpha channel). Outputting with an uniform alpha i. Default is 1 for bb, and 0 for br, bg and ba. py modified to use a single ContourSet class Mac users no longer have to install FFmpeg manually via the Terminal utility, you simply download the app, open it and it will automatically install the FFmpeg assets if it can't find them on the local system. jpg -alpha set -channel a -evaluate set 50% +channel semi_transparent. jpg -filter_complex overlay . Merge the old FFmpeg Exporter into the Advanced Exporter and add various new advanced options (for Fraunhofer VBR, fast start movies, to set x264 preset, to use the legacy FFmpeg exporter, etc. 1 channel ordering - update to FFmpeg 0. It is designed to compress VHS-quality raw digital video and CD audio down to about 1. i notice unity does not transcode it like other files, and its icon looks like a page with the corner turned down. avi" But as stated I lose the alpha channel, any ideas on how I could significantly compress my file while preserving the alpha channel? You need to use a video codec that supports transparency. whole alpha plane reset to 0 or 0. No video format I tested was importabele to show transparancy. This is the result I  This: Incompatible pixel format 'bgra' for codec 'libx264', auto-selecting format ' yuv420p'. Blizzard draws a parallel between the GIF patent situation 5+ years ago and the current situation with H. To specify a channel layout, FFmpeg makes use of a special syntax. com Author: Bob (grafman) Free - bfree(at)graphcomp. types. 264 video codec. They are from open source Python projects. Real-time Automatic Deep Matting For Mobile Devices. Adobe Media Encoder Failed Export Premiere 2005-10-14 Removed sqrt from dvipng 1. * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur. /file1. Featuring four 12G‑SDI connections, DeckLink 8K Pro supports all SD, HD, Ultra HD, 4K DCI, 8K and 8K DCI formats. gz About: MPlayer is a Unix movie player that can play most standard video formats out of the box and almost all others with the help of external codecs. That of course is a bit of a PITA since you end up with a folder of hundreds or thousands of files. Unfortunately, this may not work reliably for all version before Alpha 4, so we recommend that you reinstall Alpha 4 from scratch just to be sure. 6 branch Fixed incorrect handling of 3-channel and 5-channel FLAC and Vorbis files. + * + * FFmpeg is distributed in the hope that it 1, Using an Online PNG to ICO Converter. PNG-8. Copy Turns 'On' the alpha/matte channel, then copies the grayscale intensity of the image, into the alpha channel, converting a grayscale mask into a transparent shaped mask ready to be colored appropriately. He's also held the record for the calculation of the largest known prime and the most digits of Pi, wrote the first x86 emulator in JS that could boot Linux, won the International Obfuscated C Contest, etc etc. 8 Mountain Lion or later. YUV is a color encoding system typically used as part of a color image pipeline. " So Apple agrees with me. mp4 Update: This only works if the input . of HEVC presets, but at least you get the option to preserve the alpha channel. c ffplay. webm -qscale 0 output. ffmpeg is a very fast DeckLink 8K Pro is an advanced Generation 3, 8 lane PCI Express capture and playback card designed for high resolution 8K workflows. mp4 -f gif StickAround. c ffmpeg. egg-combine-geoms. Documentation for extensions is a work in progress. 1. stream. FlexJobs CEO Sara Sutton: What newly remote companies tend to get right/wrong; * UI: Prevent thread stalls with fader/volume widgets * obs-transitions: Convert premultiplied alpha to straight * UI: Add 24 NTSC as a common FPS value * obs-ffmpeg: Do not use HW accel by default on mac * rtmp-services: Update twitch ingests * obs-ffmpeg: Fix compiler warnings * UI: Fix compiler warning * UI: Change volume meter update -layouts show standard channel layouts-sample_fmts show available audio sample formats Global options (affect whole program instead of just one file:-loglevel loglevel set libav* logging level-v loglevel set libav* logging level-report generate a report Using the ffmpeg command, this is what I type to convert an MKV to MP4: ffmpeg -i filename. I've just edited one photo in GIMP to have a transparent background. 264 (using x264) which doesn't support alpha. At the end of the first stream, the "overlay" filter overlays the white stream over the black one, using the untouched alpha channel as the mask. c libavcodec/cscd. 0 Categories ffmpeg . The addition of an extra repository may be necessary. c libavcodec/bmp. YV12: Plugin: mg262: CombMask -pass n select the pass number (1 to 3) -vf filter_graph set video filters -ab bitrate audio bitrate (please use -b:a) -b bitrate video bitrate (please use -b:v) -dn disable data Advanced Video options: -pix_fmt format set pixel format -intra deprecated use -g 1 -rc_override override rate control override for specific intervals -sameq Removed If you want the best of both worlds, it can handle colors in a lossy way, while making sure that the alpha channel is still lossless. An image in “L” mode. TXT file containing all the command-line options. Mediainfo doesn't always identify the channel arrangement correctly. Any idea of a pixel format which can be used with ffmbc in order to preserve alpha channel Vmix Ffmpeg Settings 729742: glcolorconvert: Should set alpha to 1 if source is opaque 729743 : glcolorconvert: Should preserve alpha channel when doing AYUV - > ARGB 729861 : glfilter: lose some caps informations like the framerate Jun 25, 2014 · Hi Rhino-new, Looking through your `ffmpeg -codecs` output, I see this line: D. DeckLink 8K Pro is an advanced Generation 3, 8 lane PCI Express capture and playback card designed for high resolution 8K workflows. mng Output video into an animated MNG file using 24 bpp RGB images with lossless compression. On his blog, Christopher Blizzard looks at HTML5 and the patent-encumbered H. top field first (default auto) RoQ AVOptions:-quake3_compat E. CaptureFlux The fix to escape the variable trap is to use %% so keep in mind whenever you see % in FFMpeg examples it should be %% in Windows. The format option may be needed for raw input files. But as a standard at work I go with Pro Res 4444. Standard loopholes apply. Filtering in FFmpeg is enabled through the libavfilter library. Use the ffmpeg command and optionally set the real-time buffer: ffmpeg -rtbufsize 1500M. The following are code examples for showing how to use cv2. tar. This loss is not an issue if the image is not edited. label (text, text_ctxt, translate, icon, icon_value), was (text, icon); bpy. mov -c:v prores_ks -profile:v 3 side_faceProfile3_KS. png (in png format), or show it in GUI window. One way is to fade out the alpha channel at the end of one picture, fade in the alpha channel at the beginning of the other, make the beginning and end fade of both pictures overlap, and overlay the result on a black video. mov) is converted to the yuva444p pixel format (YUV 4:4:4 with an alpha channel), the ‘lut’ filter (aka lookup-table filter) sets the alpha channel to 50% (the ‘128’ is half of 2^8 which is the bit depth of the pixel format), and then the video is negated (all values are inverted). The filter did not preserve alpha transparency. CAP_PROP_FRAME_COUNT(). That's a bit of a dealbreaker for me, as I'm often sorting and organising . Even the Cineform codec uses higher bit depth for alpha+RGB than for RGB only. 1 WAV file into per-channel files ffmpeg -i in. avi  19 Aug 2015 But I want to preserve the transparency for video players that support it (Chrome) I think I'm close, but need to somehow use flatten but preserve the alpha channel. png Copy the BMP files to an easily accessible location, preferably in their own folder for convenience. apk to abcd1234_TCT_ALCA May 06, 2020 · Precondition check for Channel Editor/Edit Transports; Preserve data for deleted channels that are still referenced. c" betweenMPlayer-1. ‘channel_layout’ Search Tricks. 264. mp4 But there is In both streams the alpha channel is untouched. Changelog - support for FFmpeg PCM audio decoding offloaded to BubbleUPnP Server 0. wav -map 0:0 -map 0:0 -map_channel 0. While Photoshop is a go to tool for this, there are many other ways it can be … [2] A subset of things he started: LZEXE, FFMpeg, QEMU. I know that I can preserve this offset when cutting the files with -copyts. 27 * Use Skeleton 4. Other features include picture sizes ranging as high as 5K and 4:4:4 chroma subsampling up to 12-bits per sample. channel sources, from within the application. getchannel (channel) [source] ¶ Returns an image containing a single channel of the source image. jpg comp2. Likewise, quantize and dither RGBA or gray+alpha PNGs to a palette, if possible. 3. Whether to respect known limitations in Quake 3 decoder (default true) rv10 encoder AVOptions:-mpv_flags E. 28 - select resize method via commandline - fix 5. png) as input to ffmpeg. – Channel mixer – Match color – Selective or secondary color correction – Spotlights. mov file to webm and can play it back outside of unity, but it won't play back in unity. Now a line with KS(Konstantin Shishkov). Alpha Opaque Mar 29, 2018 · Note that these methods don’t play nicely with sources with transparency/alpha *yet* – hopefully more on that in a future blog post. - bfree(at)fabrikinc. gif %04d. The first photo exported fine (with the transparency), however the second photo does not export with the transparency. 2 recently released, is the leading multimedia framework, cross-platform solution that is used to decode, encode, transcode, mux, demux, stream,filter and play any audio or video files. png dachshund. how to use alpha channel to make transparent effect. You should not change alpha channel value. FFMPEG uses the open source x265 project for HEVC encoding. Running the command vlc --help will create a . - 'Settings > Chromecast Transcoding > Preserve multichannel audio' is by default disabled on new installs and prefs page reset - Chromecast local transcoding: force stereo if 'preserve multichannel is enabled', device is not a Chromecast v1 and has the Opus stutter bug (firmware 1. 2. , 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ When transcoding an flv file which has an alpha channel into a video or image file using codecs that support alpha channel (such as h264, or Apple Animation  29 Jan 2019 I think that the question has been solved. It uses color thresholds rather than absolute values as the criteria for setting the alpha channel transparency. I want to generate a sequence of images and preserve the alpha channel  4 Jun 2020 Videos on the web with an alpha channel open up many possibilities. It is said to use "greater then 16-bit per channel" floating point arithmetic's for better gamut-mapping models that are meant to provide superior color space conversions than ICC rendering intents. Sponsored by Fabrik Inc. Using the ffmpeg command, this is what I type to convert an MKV to MP4: ffmpeg -i filename. Opus is a lossy audio compression format developed by the Internet Engineering Task Force (IETF) designed to be suitable for interactive real-time applications over the Internet, a including music as well as speech, yet it is also very competitive for use as a storage and playback format, being a class leader at around 64 kbps and also at 96 kbps. ) The second is the way almost all sensible x86 software should behave. How do I make a delay of 20 milliseconds in the left channel of an audio file (e. webm -pix_fmt rgba  Alpha channel under a threshold is changed to the transparent color. GIF as they also include an 8-bit transparency channel, which allows the colors in the image to fade from opaque to transparent; GIF images only support fully opaque or fully transparent pixels. Function Arguments¶. /ffmpeg -i phfx_com. 9-update28+ for playback to external UPnP/AV renderers. ffmpeg [global_options] {[input_file_options] -i ‘input_url’} {[output_file_options] ‘output_url’} 2 Description. mp4` ffmpeg -framerate 60 -i 8_bit_alpha%04d. Jan 12, 2020 · By default, FFmpeg outputs a lot of text during the conversion. D. 1 -map_channel 0. -channel_layout Pretty self explanatory and not strictly needed for stereo audio but it is necessary for dealing with multi-channel audio or separate audio streams so think of it as another best practice. What about 444? An example:. If you have subtitles for a movie or documentary, it is possible to use FFmpeg to insert them into your video file: ffmpeg -i input. This will make a Matroska container with a VP9 video stream and a Vorbis audio stream, essentially the same as the WebM we made earlier. Converter and File Operations components no longer strip trailing dots from names of created files. For the next update (0. you can set alpha chanels in your images using image procesing tools like Paint. mkv. All common channels will be replaced with the new version, while new channels are appended to the Gateway clip. is where your alpha's being lost. Looks to be an encoder deficit, probably due to the rapid transition in the alpha from 1 to 0 in the border regions. The only working method is to import PNG image sequences, the way jwrl explained perfectly above. If there is any slight shading that needs to be cropped over, use the -fuzz x% option, where x is a low number (try 3 or 6 first). DNxHR now support both 8-bit and 10-bit color depth. 125 for a 25fps timeline) to align video and audio drift, if generated during video tape capture for example. 0. * @return The best pixel format to convert to or -1 if none was found. The "D. 0 by default (including index), can be disabled with --skeleton-3 or --no-skeleton * update to FFmpeg 0. Returns. Note: Apple ProRes 4444 XQ requires OS X 10. Flags common for all mpegvideo-based encoders. 22. One reason for the speed is that Mythbrake can preserve anamorphic pixels, thus saving on resizing. srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast video-output. mov video containing an alpha channel and encoded in png & mp3. com This vhook demonstrates the use of av_read_image to load still images with alpha/transparency and composite them on video. Recent Posts. Video filter extensions. 87 change log Jun 12, 2017 · A logo with a transparent background can be crucial to having professional level designs and ads. mkv -vcodec copy -acodec copy filename. c libavcodec/avcodec. In "Content" project where your textures are: 1 Synopsis. FFmpeg participated to the latest edition of the Google Summer of Code Project. 4 Oct 2017 When OpenGL render, alpha processing when saving with FFmpeg differs I am sorry It seems to be a problem of the preservation process rather than if buffer has premultiplied alpha, we can't just ignore alpha channel,  6 Mar 2019 This tutorial shows you how to speed through some After Effects fundamentals, including transparency information. In that time we have made many improvements to woof to modernise Puppy and hopefully provide a more modern interface. 9MB installer) Windows x64 (5. It is a list of popular video formats that support alpha (transparency) channels. In this example the input width is 640. If you want the best of both worlds, it can handle colors in a lossy way, while making sure that the alpha channel is still lossless. See below for a script to bulk trim and compress all images in a The server runs an FFmpeg executable to relay the stream without transcoding (it copies the incoming stream to a multicast address to stream to multiple students). c libavcodec/bmpenc. MKV would now be the recommended export preset and Edit Friendly format for all lossless codecs like HuffYUV and Ut Video in order to preserve all color metadata. The ffmpeg QuickTime Animation implementation also supports -pix_fmt argb, which gets you 4:4:4:4 RGB, meaning it has an alpha channel. By default, mp4 uses H. It gives you more options of where you can place your logo, and allows for a polished look for the end product. mkv Summary. All transcodings are single pass with constant quality as this results in the same quality as with dual pass but without the need for a second pass. avi out. g Quicktime PNG with RGBA) OR export a sequence of transparent PNGs; Feed the transparent video OR the sequence of PNGs (e. ogg Note that currently each output stream can only contain channels from a single input stream; you can’t for example use "-map_channel" to pick multiple input audio channels contained in different streams (from the same or different files) and merge The Real Time Streaming Protocol, or RTSP, is an application-level protocol for control over the delivery of data with real-time properties. File format: Different video file types store data in different ways, which is why a WebM video is lighter than an MP4 video. You can vote up the examples you like or vote down the ones you don't like. RGB32: Plugin: Grandpa Oddball ColourMask: Creates colour masks. avi final_video. 2005-10-14 Added width kwarg to hist function. webm  7 Aug 2017 I'm working with ffmpeg and processing MOVs with alpha channels. e. Set the alpha blending to use when the input has alpha but the output does not. 5 Mbit/s (26:1 and 6:1 compression ratios respectively Highlight of changes in Gallery 2 Alpha 4 (Nice Commits) - Upgradeable Core and Modules - At long last we support upgrading from one version of G2 to the next. If you don't want to see it, you can add the -loglevel panic option to tell FFmpeg to only print serious errors and questions. Convert subtitles to video with alpha to insert them in filter graphs. Jun 12, 2020 · Re: [FFmpeg-devel] [PATCH] avfilter/vf_chromakey: The chromakey filter preserves non-opaque alpha transparency. History A channel layout specifies the spatial disposition of the channels in a multi-channel audio stream. ColorScreenMask is a special effects plugin for processing chroma key (i. You must then use FFmpeg with DOS command lines, like : 25 Apr 2017 If the source has an alpha channel - use a pixel format such as bgra to preserve it . chromium / chromium / third_party / ffmpeg / 9fc7ad7272e1b4d6290a4ddf0d0f57beff97b92e / . + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2. Converting video files to audio files The one that works is only SD, but is uncompressed RGBA as well, the same as your ffmpeg test earlier. Aug 10, 2012 · PNG: open, lossless compression, alpha channel. This fix changes the entire discussion. The second input (fileB. -map_channel file. ~3-6 cycles saved overall by doing that. April 18, 2016. You can use the same filename to overwrite the full-size image with the resized image, if that is what you want. syncstream] map an audio channel from one stream to another -map_chapters input_file_index set chapters mapping -itsoffset time_off set the input ts offset 719431: videomixer: Should fail negotiation if it can't preserve the alpha channel of input streams; 719811: pulsesink: Leak of device_info in gst_pulsesink_sink_info_cb; 720813: qtmux: Invalid calculation of descriptor length; 720986: vp9dec: Don't build with libvpx earlier than 1. 97 fps. What is the performance impact for inputs without an alpha channel? Firstly, I'm new to this world of filters. For example turning the alpha channel off then on can be used to preserve the alpha channel data before applying some very specific operators, such as "-shade". Apple ProRes 4444 XQ features a target data rate of approximately 500 Mbps for 4:4:4 sources at 1920 x 1080 and 29. Fixed Slow alpha with experimental algorithm and mode 3/4; Some fixes to "Resume Render", it may still present a few problems. ffmpeg starts the command-i input_file path, name and extension of the input file The alpha channel is encoded as a transparent track. Could be index (0 for “R” channel of “RGB”) or channel name (“A” for alpha channel of “RGBA”). To split a 5. org. After trying out the Ubuntu/Medibuntu version of ffmpeg and the associated libraries, I realized that the packaged version doesn't support the On2 VP6A codec at all. Please note: For general Gentoo support, please get in touch with our support community instead. 39): A pixel-art tab. Default is 1 for aa, and 0 for ar, ag and ab. c libavcodec/c93. You don't have to do this, of course. Flow Sftp Flow Sftp Feb 27, 2015 · Also, notice I saved the resized image under a different name, resized_image. png $ composite semi_transparent. Mar 29, 2018 · I am trying to find a product that will convert . c libavcodec/aasc. 2 - BubbleUPnP Server 0. It lets you overlay the exported QuickTime movie on top of other content to alter the background color or scene. 1:0. PNG images are in many ways better than . Here's what you need to  A transparent video is like an image with an alpha channel, that is to say an image The simplest one is through Ffmpeg, the other one is through After Effects. See alpha_type above. FL for front left) or its index in the input channel layout. ffmpeg -i input -vf scale=iw/2:-1 output iw is input width. luma_power, lp chroma_power, cp alpha_power, ap Specify how many times the boxblur filter is applied to the corresponding plane. (default 0) Waveform monitor display options in Final Cut Pro. MIDI editor: preserve overlapping notes after closing/reopening editor when option is enabled . ffmpeg is a very fast FFmpeg 3. Alpha channel sampling can be as high as 16-bits. For registered users, and pro trial users, starting from build 121, FastPictureViewer Professional offers the option to use the new WCS 1. Speed up your video 1 Synopsis. The TIFF importer now asks how to process unspecified TIFF channels: use as non-premultiplied alpha (used to be the default), as premultiplied alpha, or just import as a generic channel. Appendix. Targa: Compressed Targa. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. lumakey filter, -vf lumakey=16:0:0 will add to pixels with 16 luma and only 16 luma alpha component which is completely transparent. c libavcodec/8bps. Set this true to combine sibling GeomNodes into a single GeomNode, when possible. 19 Alpha. The result is a grayscale representation of the alpha channel - the actual rgb video content is thrown away. To check list of supported formats by FFmpeg, run: $ ffmpeg -formats 3. Mezzmo includes device profiles for all popular UPnP and DLNA devices and these profiles list the known format support for each particular device. MIDI editor: respect channel dropdown (including "all channels") when editing or marquee selecting CC events . ) Notice how above options are very different from the default options activated by choosing "-vo opengl-hq", which really don't look good when down-scaling 4k to 2k. gz and MPlayer-1. g. Hi I use the below command to place one image on one video:ffmpeg -i . For an example of this special usage see Shaded Shape Images. This is code-golf. Video and audio There are some format options but it is kind of tricky to find something that will convert and preserve the Alpha. Be sure to keep your file name exactly as it appears (for example, if your file name uses a capital letter, enter it using the capital letter in the -Premultiplied alpha: by default bpgenc uses non-premultiplied alpha to preserve the color components. Auto Added by WPeMatico. if you're using Ubuntu, or: yaourt ffmpeg. 0 es un GUI traducible para el convertidor ffmpeg. This would require the * @param[in] has_alpha Whether the source pixel format alpha channel is used. The alpha channel data is left intact just deactivated. Moreover, you can resize video on the fly with high-quality results. m2ts and PRESERVE the 8-channel audio. Corollary: Quantize and dither truecolor images to a palette if quality is acceptable. Otherwise, you’ll need this (takes much longer): ffmpeg -i stereo. On a completely separate note, can your program (or ffmpeg alone) convert both m2v & ac3 files to MP4? * UI: Prevent thread stalls with fader/volume widgets * obs-transitions: Convert premultiplied alpha to straight * UI: Add 24 NTSC as a common FPS value * obs-ffmpeg: Do not use HW accel by default on mac * rtmp-services: Update twitch ingests * obs-ffmpeg: Fix compiler warnings * UI: Fix compiler warning * UI: Change volume meter update For example, if I had the RGB and alpha as separate PNG files (24 and 8 bit, respectively), I would do something like this: ffmpeg -framerate 60 -i 24_bit_rgb%04d. Also, looking through your shell output from calling ffmpeg directly, you're encoding from h264 to h264, not vp6. 9-update28 released. mkv -vo mng:output=test. wav -i original_video. 0 -t 2. "Donating to help keep FFmpeg online is our way of giving back to the community" . Once Blender finishes rendering a scene (this can take some time), press F3 and the save dialogue will be opened where you can specify a filename and location for the output. Arrangements involving portable devices (e. mov -c:v prores_ks -profile:v 4 -pix_fmt yuv444p10 side_faceProfile4_KS Composite an alpha-channel logo with optional drop-shadow onto video. The Internet Archive Software Collection is the largest vintage and historical software library in the world, providing instant access to millions of programs, CD-ROM images, documentation and multimedia. FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams. And you can have separate quality settings for video and alpha with this method. syncstream] map an audio channel from one stream to another -map_chapters input_file_index set chapters mapping -itsoffset time_off set the input ts offset Categories ffmpeg . ffmpeg -i "input-video" -c:v rawvideo -pix_fmt bgra "output. The -1 tells the scale filter to preserve the aspect ratio of the output, so in this example the scale filter will choose a value of 240. FlexJobs CEO Sara Sutton: What newly remote companies tend to get right/wrong; Mezzmo supports reading and transcoding all popular file container, audio formats, video formats, image formats and subtitle formats. ‘ar’ ‘ag’ ‘ab’ ‘aa’ Adjust contribution of input red, green, blue and alpha channels for output alpha channel. by ffmpeg when some non ffmpeg created 4. vp6 On2 VP6. April 14, 2016: NewTek today announced NewTek TalkShow VS 4000, the only professional, multi-channel video calling production system for both The creator has updated the post. I made a mistake on confirming whether the webm video has the alpha channel. 8 Nov 2018 Handbrake is not the best at preserving the metadata of the original file. 264 where it would be two videos that (I believe) requires specific software to view. The command ffmpeg -codecs will print every codec FFmpeg knows about. ffmpeg -i input_file-itsoffset 0. See the FFmpeg documentation for additional information. Preserve aspect ratio on export. A tab to select a few more configurations, like ffmpeg crf and png compression level; Improve split option so it's not so XNA Texture2D Content Pipeline compilation uses original alpha channel to remove backgrounds. alpha. exe, oggenc2. , smartphones and tablet computers) are disclosed. And this is essential to packagers. bits for alpha plane (from 0 to 16) (default 16) rawdec AVOptions:-top . That way you can use any modern codec, without being limited to exotic formats that support alpha in video. srt -c copy -c:s mov_text output. It's free, confidential, includes a free flight and hotel, along with help to study to pass interviews and negotiate a high salary! - update to current FFmpeg api 2011-07-30 new version released - 0. ffmpeg -framerate 10 -i blink%02d. Individual channels are identified by an id, as given by the table below: ‘FL’ front left ‘FR’ front right ‘FC’ front center ‘LFE’ low frequency ‘BL’ back left Specifies the alpha mode to apply when the alpha specification “on” appears in the egg file (or when a primitive is implicitly transparent, because of a <RGBA> that involves a non-unity alpha, or because of a four-channel texture. png # Preserve alpha channel mogrify -background black -flatten-format bmp *. Prevent backend shutdown if jobs are still running or pending. c ffprobe. From the Apple ProRes White Paper: "The Apple ProRes 4444 codec losslessly encodes alpha channel values of any bit depth up to and including 16 bits. This fixes a known bug with 4-channel (RGBA) TIFF files as demonstrated here. -YUVA444P10 — with Alpha Channel. Whatever your distribution of choice, you will most certainly find ffmpeg available in your package manager. I'm working with ffmpeg and processing MOVs with alpha channels. UILayout. If you need something more simpler, like convert only 16,128,128 to black use geq filter to create alpha plane: FFmpeg: Ultimate film grain this is but I found a page where someone suggested high aq-strength to preserve grain image to it as an alpha channel and overlay Background One of the most requested features for WebM as used in HTML5 is for alpha channel support, i. mpg Add Text Subtitles to a Video. We will use this scale_percent value along with original image’s dimensions to calculate the width and height of output image. a value for each pixel in a video frame that indicates the desired transparency, where 0 is completely transparent and effectively masked, and 255 is completely opaque. FFmpeg, HandBrake, MPEG Streamclip are some of the compression tools that can be used to restructure the way pixel data is stored to make the final video optimized and lighter. L. I have heard of ways to do it with H. Extensions overview. Follow their code on GitHub. 0 alpha). This package will automatically retrieve and build the latest development snapshot of Mixxx from git (master branch, currently 2. wav -filter_complex in a format that doesn't support an alpha channel. You can find more detailed information about FFmpeg in the FFmpeg documentation. MPEG-1 (video) MPEG-1 is a standard for lossy compression of video and audio. mov You should notice that ffmpeg defaults to 422 if you do not specify it. mng). Prevent data corruption in dvbchannel. Select this option if you have reason to believe the post has been updated by its creator. Individual channels are identified by an id, as given by the table below: I know that I can preserve this offset when cutting the files with -copyts. Vmix Ffmpeg Settings A channel layout specifies the spatial disposition of the channels in a multi-channel audio stream. It encodes a color image or video taking human perception into account, allowing reduced bandwidth for chrominance components, thereby typically enabling transmission errors or compression artifacts to be more efficiently masked by the human perception than using a "direct" RGB-representation. 4MB installer) OS X Intel (7. 8. NET, gimp or photoshop. 2005-10-04 Added rkern's texmanager patch. On student computers, to get received frame data into Unity, we use a native C++ DLL modeled after an FFmpeg-provided C example, allowing Unity to interface with FFmpeg. The first is actually bad, because it will do far more things than you've actually tested and can secure. For any questions related to using or editing the wiki, you can always join our #gentoo-wiki IRC channel on Freenode or email us at wiki@gentoo. Individual channels are identified by an id, as given by the table below: Preserve Aspect Ratio Downscale with resize() In the following example, scale_percent value holds the percentage by which image has to be scaled. Q&A for Ubuntu users and developers. h ffmpeg_filter. See the sections “#Size and scaling” and “#Unsupported file types” for ways to preserve the versions in other formats. Oct 29, 2015 · $ ffmpeg -i video. ” It does use the same lossless compression as PNG-8, but you will obtain a larger file size due to the amount of information that will be retained vs. 0 is a universal media converter, recorder, streaming issuer, cd ripper and editor Libre AV Converter 2. 5 -i StickAround. Feb 04, 2011 · PNG 24 is similar to 8, but has support for 16 million colors and will preserve color variations such as gradients better and help prevent “banding. Someone above mentioned the formats but the only one I have found that has kept the alpha is going to a PNG sequence. To achieve transparency in Adobe After Effects you will need to set the alpha video as the other's TrkMat parameter. jpg, because I wanted to preserve the full-size image (fullsized_image. I want to generate a sequence of images and preserve the alpha channel in the images generated. Parameters. 1 of the License, or (at your option) any later version. FFmpeg got a total of 8 assigned projects, and 7 of them were successful. I think this works with transparency only from version 4. gif But I wouldn’t recommend it. If not specified, chroma_power and alpha_power default to the corresponding value set for luma_power. General support is not provided via the wiki. 5. c libavcodec/aura. Output that image to a file called a. c. exe). 2005-09-25 contour. However, premultiplied alpha ('-premul' option) usually gives a better compression at the expense of a loss in the color components. "Fossies" - the Fresh Open Source Software Archive Source code changes of the file "ffmpeg/ffmpeg. Sometimes its a different channel arrangement like BGRA, or ABGR . start_time, st Specify the timestamp (in seconds) of the frame to start to apply the fade effect. When loading a new multi-channel clip as a version of an ex-isting Gateway Import clip, the application attempts to preserve all connections and identify all common channels between versions. * Foundation, Inc. Timo Rothenpieler Fri, 12 Jun 2020 04:59:25 -0700 On 12. avi" -map 0 -c:v libx264 -preset slow ^ -crf 17 -acodec copy "C:\Users\djcim\Desktop\Intro For Now\Compressed. Of course, other filters for color managing exist as invert, grayscale, color substitution, color preserve, etc but the tools used for the color correction and photographic enhancement are the one I put on the list here above. , a green screen or blue screen) backgrounds. One arrangement enables a content creator to select software with which that creator's content should be rendered—assuring continuity between artistic intention and delivery. The FPS tutorial uses 2 Animation Codec QuickTime movies in the GUI that have alpha channels (the rocket and ammo counters). Anyway you shouldn't use gif, it's  can't seem to find a solution. FFmpeg has 7 repositories available. c ffmpeg_opt. At its core is the FFmpeg program itself, designed for command-line-based processing of video and audio files, and widely used for format transcoding, basic editing (trimming and concatenation), video scaling, video post Nov 10, 2011 · ffmpeg -vlowres 1 -i dvcp. 719431: videomixer: Should fail negotiation if it can't preserve the alpha channel of input streams; 719811: pulsesink: Leak of device_info in gst_pulsesink_sink_info_cb; 720813: qtmux: Invalid calculation of descriptor length; 720986: vp9dec: Don't build with libvpx earlier than 1. You can also use this to get more exhaustive list: API/ABI sure is a problem, but please look at how Gentoo and potentially some other distros do that (e. Accepted types are: fn, mod, struct, enum, trait Reverse colors in that image, so that for example dark green (0, 75, 30) would become (255, 180, 225) (because 255-0=255, 255-75=180 and 255-30=225). 6 alpha channel mask. mythnuv2mkv insists on resizing to square pixels, increasing file size and encoding time. supports up to 12 bits per image channel and up to 16 bits for the alpha channel. 2020 00:31, Gavin Smith wrote: i successfully did a ffmpeg command line conversion without the alpha channel of the 6 MB . mp4 -c:v vp9 -c:a libvorbis output. FFmpeg 3. MIDI editor: respect option to select CC with notes during all mouse selection actions . blob: 01ee15e65c7decec2473eb0f71eb0828368773ec (The Alpha channel in the output is not strictly needed, but it seems that more drivers support RGB with Alpha channel than without. bpy. In all the examples below, make sure you use the right […] alpha If set to 1, fade only alpha channel, if one exists on the input. /file2. One annoying thing about using QuickTime Pro for exporting movies with alpha is that the movie cannot be resized at export or all is lost. You could look at VP8 or VP9, which do support alpha. mkv file is already using h264 as the video codec (see, it’s copying the video rather than transcoding it). RTSP provides an extensible framework to enable controlled, on-demand delivery of real-time data, such as audio and video. menu (menu, text, text_ctxt What is a regular expression which matches the following strings? [INFO] abcd1234_TCT_ALCATEL_one_touch_995 : Successfully uninstalled com. You can If FFmpeg is missing you can easily install it right from the same terminal by typing: sudo apt-get install ffmpeg. I also took a bit of a dive into our FFmpeg-handling code, fixed in the below patch: D5156: FFmpeg: added WebM container + alpha support, and added Opus support; D5191: Alembic import: load face-varying normals; USD export support for perspective cameras. Four different product lines – the XDCAM SD, XDCAM HD, XDCAM EX and XDCAM HD422 – differ in types of encoder used, frame size, container type and in recording media. 23 implementation (like the FFmpeg and derivative implementations) may lead to The role of a codec is to preserve image quality as much as possible at a particular  To set the video bitrate of the output file to 64kbit/s: ffmpeg -i input. 9. ffmpeg -re -f lavfi -i "testsrc=size=864x480, format=pix_fmts=yuv420p" -f lavfi -i "sine=frequency=5000:sample_rate=44100, aformat=channel_layouts=stereo" -c:v h264 -b:v 600k -profile:v main -preset ultrafast -c:a aac -strict -2 -b:a 64k -f flv toto. 5 Mbit/s (26:1 and 6:1 compression ratios respectively Simple media player usage: ffplay [options] input_file Main options: -L show license -h topic show help -? topic show help -help topic show help --help topic show help -version show version -buildconf show build configuration -formats show available formats -devices show available devices -codecs show available codecs -decoders show available decoders -encoders show available encoders -bsfs Strength, also called alpha, controls the amount of smoothing along the edges of blocks, with the default of 0 good for most situations. 26 Aug 2019 Convert WebM and keep transparency/alpha channel(Premiere Pro/Vegas Pro) ffmpeg -vcodec libvpx-vp9 -i original. It does not need to be updated on every release, so please do not flag out of date unless the build breaks or any actual packaging issue. Note that MPlayer in general does not support alpha, so this will only be useful in some rare cases. 0 because of non-final bitstream Adjust contribution of input red, green, blue and alpha channels for output blue channel. Has anyone created a prores quicktime with an alpha channel with ffmpeg (or anyother software on windows7)?  Alpha Channel Support in Apple ProRes 4444 Codecs. Many under the hood improvements, fixes and more. mp4 -i . avi -b 64k output. 9MB DMG) See the sections “#Size and scaling” and “#Unsupported file types” for ways to preserve the versions in other formats. Like standard Apple ProRes 4444, this codec supports up to 12 bits per image channel and up to 16 bits for the alpha channel. 0 provides a translatable GUI for the converter ffmpeg, also can expand to more similar binary Libre AV Converter 2. jpg Here is a masking example. Using -filter_complex 'overlay' and copy video stream. REAPER v3. Converting the image in PNG( or jpg, gif ) format to ICO format with an online application( for example, ICO Convert) might be more efficient if you do not have a large quantity of icons to convert, an online conversion tool always allows you to perform the conversion task without registration and downloading any software, you can use any Internet Sep 16, 2019 · @DRM @pdr @shotcut @D_S The slow-loading Matroska bug has been fixed by the incredible developers on the ffmpeg team (see the link in the post above for ticket details). + * This file is part of FFmpeg. The output of this command will change depending on the version of FFmpeg you have Jan 26, 2020 · ffmpeg -i sound. png. */ enum PixelFormat avcodec_find_best_pix_fmt2 (enum PixelFormat * pix_fmt_list, enum PixelFormat src_pix_fmt, Feb 18, 3:24 PM 2. Possible reasons for updating a post include replacing "placeholder" images, an increased image resolution has been made available, or new attachments have been uploaded. There is other way just to set specyfic color (example white) to be transpatent. 142. 1 OUTPUT. png out. Hello all, I'm having some rather frustrating problems when attempting to convert an FLV video file with an alpha channel to a PNG image sequence that would preserve the transparency. Portrait segmentation refers to the process of segmenting a person in an image from its background. Let’s finish this round-up with an advanced Mar 16, 2015 · ffmpeg binaries come with all possible codecs and all possible CPU features. That is all for now but these are just few examples of using FFmpeg, you can find more options for what you wish to accomplish. The convert -alpha Off -compose CopyOpacity command is the one doing the masking. flattening method: Spectral (SCP) check preserve seams check preserve island boundary shapes (this removes distortion by applying a uniform relax on the interior of each UV island!!) (click into UV view window, press Enter) add vertex split node attribute: UV add group node uncheck basegroup check include by edges check unshared edges group I had a few stall cycles during lighting, so I used them to preserve the MSB for lighting and blending, which saved a store, load, and orr later on. XDCAM is a series of products for digital recording using random access solid-state memory [disambiguation needed] media, introduced by Sony in 2003. 0 color TalkShow ® VS 4000 Multi-Channel Video Calling System. (In fact, nobody on earth has tested most possible ffmpeg command lines. ffmpeg -i "C:\Users\djcim\Desktop\Intro For Now\Video Intro. mp4 -i subtitles. mov -c:v libvpx-vp9 -pix_fmt yuva420p -an output. png -c:v libx265 -x265-params lossless=1 alpha. Dec 25, 2015 · + Video: fix end-of-video flush when using ffmpeg/libav encoding + Video: support FFmpeg 2. This is to address trac ticket #8724. EXAMPLE: mplayer video. Converter now accepts alternate names for some of command-line encoder binaries (mpcenc. Prefix searches with a type followed by a colon (e. 2020 PQ clips and projects only) in the clip currently being examined. This saved a few useless uxth instructions for another few cycles. 0 OUTPUT. webm. The order of the “-map_channel” option specifies the order of the channels in the output stream. Jun 05, 2017 · ffmpeg-i input. This is a temporary solution until libavfilter gets real subtitles support. avi This allows more bits to be used for lower frequencies while preserving green and blue components lutrgb="g=0:b=0" # set a constant alpha channel  I have not found a simple solution to WebM VP8 encoding preserving the My source is a . Dec 09, 2018 · Fixing the alpha channel will involve 2 steps: For the image outputted by feBlend, get the alpha value to be 1 for every pixel (the reason this step will become apparent once we look at how feComposite has to be used) Use feComposite to construct an image with the alpha values from the source image and the R,G,B values from the image outputted Sorenson 3 uses a 1-bit alpha channel as far as I remember and probably won't cut it. fn:) to restrict the search to a given type. 2455. if you are an Arch user. ) using imread. 640/2 = 320. H264, Apple Animation and PNG all support alpha channel, so if any of these is used as the encoder and if the input video has alpha channel, the alpha channel should be preserved by default when transcoding. ogg Note that currently each output stream can only contain channels from a single input stream; you can’t for example use "-map_channel" to pick multiple input audio channels contained in different streams (from the same or different files) and merge May 21, 2019 · If you want to preserve the quality of your source video file, use ‘-qscale 0’ parameter: $ ffmpeg -i input. Individual channels are identified by an id, as given by the table below: ‘FL’ front left ‘FR’ front right ‘FC’ front center ‘LFE’ low frequency ‘BL’ back left It has been over 2 and a half years since Barry handed over Puppy to the community. -layouts show standard channel layouts-sample_fmts show available audio sample formats Global options (affect whole program instead of just one file:-loglevel loglevel set libav* logging level-v loglevel set libav* logging level-report generate a report -map_channel file. /file3. Extensions API and ABI are improved in (mostly) backwards compatible way. out_channel is the name of the output channel or its index in the output channel layout. 7 branch 2010-06-18 new version released - 0. mp4` An alpha channel is often used as a matte, but you can use a matte other than the alpha channel if you have a channel or layer that defines the desired area of transparency better than the alpha channel does, or in cases where the source image doesn’t include an alpha channel. 'uniform_color' Blend onto a uniform background color 'checkerboard' Blend onto a checkerboard 'none' No blending Filtering Introduction. 125 -i input_file-map 1:v -map 0:a -c copy output_file. YV12: Plugin: mg262: CombMask It is easy to crop images (such as artworks) to their content (removing the surrounding solid color or alpha space) with convert -trim in. Positive values up to about +2 apply more smoothing and ultimately soften/blur the image, while negative values down to about -3 apply less smoothing and preserve more sharpness/detail, at the risk of some Jul 16, 2020 · Portrait-Segmentation. example. Items that were transparent in the input would appear black on the output or pixels that were semi-tranparent would appear opaque. The waveform monitor shows the relative levels of luma, chroma, RGB, or luminance (HDR Rec. $ convert head. Here is a link where someone was looking for the settings for Pro Res 4444. I switched from u16 to uint_fast16_t, which is 32-bit on this platform. Default value for luma_power is 2. mp4 Image Overlay on a Video. in_channel can be either the name of the input channel (e. x) PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without alpha channel), and full-color non-palette-based RGB[A] images (with or without alpha channel). g -i sequence-%05d. Libre AV Converter 2. Also in case you don't already know, FFmpeg tries very hard to preserve both backwards and Libav compatibility. Example code: rgb levels plugin This filter can process un-normalized RGBA64 format. Ffmpeg overlay video Ffmpeg overlay video In OpenCV you can easily read in images with different file formats (JPG, PNG, TIFF etc. Stereo waveform corrupted in latest alpha - regression on previous alpha: 1995: 2330: P1: RESOLVED: VST and LADSPA effects are missing: 2330: 1928: P1: RESOLVED: Export Multiple with a label track present defaults to export by tracks not labels: 1928: 2073: P1: RESOLVED: Mac: installation of LAME or FFmpeg libraries using package installer fail Image. Seeing the simplicity of the above examples, you might be tempted to create a gif with FFmpeg like so: bash $ ffmpeg -ss 61. channel – What channel to return. h libavcodec/avs. 74 - December 24, 2010 Tending to the Holidays Downloads: Windows (4. Stack Exchange Network. -alpha_bits E. ffmpeg preserve alpha channel

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