December 2022 - ffmpeg-user - lists.ffmpeg.org

Getting Unknown encoder 'libopencore-amrwb'
by Govind Rathi 15 Dec '22

15 Dec '22

Hi, I have installed the ffmpeg and configured as below - configuration: --enable-gpl --enable-version3 --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo_amrwbenc --disable-static --enable-shared I am saving the AMR-WB RTP jackets to a raw file from Wireshark. Then trying to convert the raw file to amr file using ffmpeg. Command used and its result - > ffmpeg -f amrwb -i 1111.raw -c:a libopencore-amrwb output_file.amr ffmpeg version N-109417-g5a46647f00 Copyright (c) 2000-2022 the FFmpeg developers built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04) configuration: --enable-gpl --enable-version3 --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo_amrwbenc --disable-static --enable-shared libavutil 57. 43.100 / 57. 43.100 libavcodec 59. 55.100 / 59. 55.100 libavformat 59. 34.102 / 59. 34.102 libavdevice 59. 8.101 / 59. 8.101 libavfilter 8. 52.100 / 8. 52.100 libswscale 6. 8.112 / 6. 8.112 libswresample 4. 9.100 / 4. 9.100 libpostproc 56. 7.100 / 56. 7.100 [amrwb @ 0x55790a5aa880] Encountered a bad or corrupted frame [amrwb @ 0x55790a5a1440] Estimating duration from bitrate, this may be inaccurate Input #0, amrwb, from '1111.raw': Duration: 00:03:11.66, bitrate: 8 kb/s Stream #0:0: Audio: amr_wb, 16000 Hz, mono, fltp, 8 kb/s Unknown encoder 'libopencore-amrwb' Can you please help me with the proper command or any other solution to fix the error? -- Regards, Mr. Govind K. Rathi <https://in.linkedin.com/in/rathigovind> *+91 940 429 5128*

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Converting audio to mono to mp4 output
by Alexandr Němec 15 Dec '22

15 Dec '22

Hi all, doing ffmpeg -i input.avi -c:v h264 -g 30 -bf 0 -c:a aac -ac 1 test.mp4 should produce a single audio channel in the output file. Dumping the resulting mp4 file (see the important part below) I can see that channel_count is still 2. What am I misundestanding here? Thank you. Alex ..... [mp4a] size=8+102 data_reference_index = 1 channel_count = 2 sample_size = 16 sample_rate = 44100 [esds] size=12+42 [ESDescriptor] size=5+37 es_id = 2 stream_priority = 0 [DecoderConfig] size=5+23 stream_type = 5 object_type = 64 up_stream = 0 buffer_size = 0 max_bitrate = 69830 avg_bitrate = 69830 DecoderSpecificInfo = 12 08 56 e5 00

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Stream to Azure Media Services smooth streaming format samples
by Jean P 15 Dec '22

15 Dec '22

Hi, After many hours of research I still could not find a working sample of streaming to Azure Media Services in Smooth Streaming format a multi-track audio. Here are the 2 use cases which I am looking for samples, booth to stream to Azure Media Services in Smooth Streaming format. Scenario 1: 1. Grab Desktop 2. Audio 1 (from sound card A) 3. Audio 2 (from sound card B) Scenario 2: 1. Audio 1 (from sound card A) 2. Audio 2 (from sound card B) (no video) Would someone be so kind and provide me a working sample? Really appreciated. Cheers Jean

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SSA/ASS subtitles supported colorspaces | incorrect colors
by N ONE 13 Dec '22

13 Dec '22

Hello, I'm trying to figure out if FFmpeg or the underlying subtitle rendering library supports BT.709 color space for hardcoding subtitles. I've posted the question with extensive details (with example files on Google Drive) on superuser: https://superuser.com/questions/1757284/ffmpeg-incorrect-colourspace-with-h… According to this answer (https://superuser.com/a/1757297/867738) it is deduced that FFmpeg uses BT.601 as standard for subtitles. This would explain the issues when videos with subtitles tuned for BT.709 are rendered with incorrect colors. The workaround to scale the color matrices works but is really bad on performance. Is this an issue related to FFmpeg which incorrectly determines the colorspace used for rendering the subtitles? Or is this something that has never been implemented? Regards, YTZ

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Re: [FFmpeg-user] Trouble selecting a pixel format/colorspace while trying to encode a video using ffmpeg and HW accelerated vaapi or qsv interfaces
by caetano＠vision.ime.usp.br 11 Dec '22

11 Dec '22

The second link in my last message is wrong, the correct one with the summary of the media features for Intel GPUs is: https://github.com/intel/media-driver/blob/master/docs/media_features.md On Sun, 11 Dec 2022 at 18:44, <caetano(a)vision.ime.usp.br> wrote: > My question is not related to post-processing or color-space > transformation. It is about how to hardware encode using a pixel format > that provides high color accuracy for screen capture, differently from what > NV12 is capable of offering. > > Regarding hardware encoding support, accordingly to this: > > https://github.com/intel/media-driver/blob/master/README.md > > Hardware support has been added since Ice Lake (2019, 10th generation) to > HEVC and VP9 codecs for 4:4:4 chroma for both 8 and 10 bits modes and also > for both encoding and decoding. > > This other page gives more details: > > https://github.com/intel/media-driver/blob/master/README.md > > Accordingly to the above link , the following 4:4:4 formats are supported > for hardware decoding when using HEVC or VP9: AYUV (8 bits) and Y410 (10 > bits) and the following 4:4:4 formats are supported for hardware encoding > when using HEVC or VP9: AYUV and RGB (8 bits) and Y410 (10 bits). > > I've found out that gstreamer in my system (ubuntu version 1.20.1) is > able to perform 4:4:4 10 bits encoding when using the Y410 format and the > following command (ffprobe for the generated file reports pixel format > as yuv444p10le): > > ==== > gst-launch-1.0 ximagesrc display-name=:0.0 show-pointer=false > use-damage=false num-buffers=2400 ! video/x-raw,framerate=20/1 ! > videoconvert ! video/x-raw,format=RGBx ! vaapipostproc ! > video/x-raw,format=Y410 ! vaapih265enc rate-control=cqp quality-level=1 > quality-factor=18 ! video/x-h265 ! h265parse ! matroskamux ! filesink > location=desktop.mkv > ==== > > and hardware decoding of the above generated file can be achieved with the > following command: > > ==== > gst-play-1.0 desktop.mkv > ==== > > Unfortunately, gstreamer version I have has no support for the AYUV pixel > format with hardware acceleration, therefore I could not test 8 bits > hardware encoding and decoding, but at least for 10 bits it is working > properly and colors looks just great. > > =========================== > > I believe it would be great to add support in ffmpeg for hardware encoding > and decoding for at least the following 4:4:4 pixel formats: AYUV, RGB > and Y410 as this is available in Intel hardware since 2019. > > > > On Sat, 10 Dec 2022 at 17:00, Carl Eugen Hoyos <ceffmpeg(a)gmail.com> wrote: > > > I wanted to write "no hardware encoders support full chroma" and > > "no hardware encoders support RGB" - Wenbin's answer seems > > to indicate that I was wrong but in any case the qsv code in FFmpeg > > currently neither allows full-chroma encoding nor RGB encoding. > > > > I don't know if mxf (the library used for qsv encoding) support > > full-chroma and RGB. > > > > No idea how your question could be related to post-processing > > or colour-space transformation.

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Re: [FFmpeg-user] Trouble selecting a pixel format/colorspace while trying to encode a video using ffmpeg and HW accelerated vaapi or qsv interfaces
by Carl Eugen Hoyos 11 Dec '22

11 Dec '22

Am Do., 8. Dez. 2022 um 20:32 Uhr schrieb <caetano(a)vision.ime.usp.br>: > Stream #0:0: Video: hevc (Rext), gbrp Completely unrelated: Do all your video players play above file? > ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -v verbose > -f x11grab -draw_mouse 0 -framerate 20 -probesize 42M > -video_size 1920x1200 -thread_queue_size 1000 -vcodec rawvideo > -i ":0.0" -an -vf 'hwupload=extra_hw_frames=64,scale_qsv=format=bgra' > -c:v hevc_qsv -preset veryslow -global_quality 17 -look_ahead 1 > -y /tmp/output.mkv (-vcodec rawvideo looks wrong) When asking for support on this mailing list, always provide the command line you tested together with the complete, uncut console output. > As you can see, in the first example, libx265 SW encoder based, the output > is generated with the "gbrp" colorspace while in the second example, > hevc_qsv HW encoder based, the output is generated with the "yuvj420p" > pixel format. I wanted to write "no hardware encoders support full chroma" and "no hardware encoders support RGB" - Wenbin's answer seems to indicate that I was wrong but in any case the qsv code in FFmpeg currently neither allows full-chroma encoding nor RGB encoding. I don't know if mxf (the library used for qsv encoding) support full-chroma and RGB. No idea how your question could be related to post-processing or colour-space transformation. Carl Eugen

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ffmpeg command required to convert MPEG TS to HLS with transcoding to aac
by Mahesh Velankar 11 Dec '22

11 Dec '22

I have a transport stream file with following details (given by ffprobe) Input #0, mpegts, from 'f-13324-ccrtpa_before_tc_1669374838.ts': Duration: 00:04:23.44, start: 8879.809433, bitrate: 2373 kb/s Program 3 Stream #0:0[0x31]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 856x480 [SAR 320:321 DAR 16:9], Closed Captions, 30 fps, 29.97 tbr, 90k tbn, 60 tbc Stream #0:1[0x34](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 320 kb/s Stream #0:2[0x35](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s (visual impaired) Stream #0:3[0x36]: Data: klv (KLVA / 0x41564C4B) I want to convert this into HLS playlists and segments. The requirements are as follows There will be two playlists playlist 1 will have a listing of TS segments. Each such segment will have 1. Video stream (Stream #0:0) from the above input (h264) and 2. Audio stream 1 (Stream #0:1) from the above input (ac3 5.1) .... but converted to aac format playlist 2 will have a listing of TS segments. Each such segment will have 1. Video stream (Stream #0:0) from the above input (h264) and 2. Audio stream 2 (Stream #0:2) from the above input (ac3 stereo) .... but converted to aac format In short the output segments will have one video and one audio stream. Since there are two audio streams I need to convert it into two different playlists ... each having video and one of the audio streams ac3 to aac conversion is mandatory, as it has to be played in the browser. How can I achieve this with the ffmpeg command line? Please help or point me to any such recipe if already available. Thanks

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AVCintra100 encoding with horizontal blocking artefacts
by Barnett, Phillip 10 Dec '22

10 Dec '22

Hi, I'm trying to encode AVC100 in UK (25i) but getting odd blocking artefacts, where the screen is banded in about 10 horizontal rows with random levels of brightness, which change on a sub-second basis, darker or lighter. I'm using the latest release build on a Windows 10 CPU. Any ideas? Screenshot available if I can work out where to post it. (I guess I shouldn't attach it to this email?) Many thanks in advance for any help or guidance on offer. Full uncut command line attached below. Phil C:\Users\zzzzzzzzz>ffmpeg -i C:\Users\zzzzzzzzzzzz\Downloads\testcard\PRIVATE\M4ROOT\CLIP\C6192.MP4 -y -vcodec libx264 -g 1 -pix_fmt yuv422p10le -r 25 -x264-params avcintra-class=100:interlaced=1 -strict unofficial testavcinterlaced3.mxf ffmpeg version 5.1.2-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers built with gcc 12.1.0 (Rev2, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint libavutil 57. 28.100 / 57. 28.100 libavcodec 59. 37.100 / 59. 37.100 libavformat 59. 27.100 / 59. 27.100 libavdevice 59. 7.100 / 59. 7.100 libavfilter 8. 44.100 / 8. 44.100 libswscale 6. 7.100 / 6. 7.100 libswresample 4. 7.100 / 4. 7.100 libpostproc 56. 6.100 / 56. 6.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 000002ab305c6900] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000 [mov,mp4,m4a,3gp,3g2,mj2 @ 000002ab305c6900] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000. Guessed Channel Layout for Input Stream #0.1 : stereo Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\barnettp\Downloads\testcard\PRIVATE\M4ROOT\CLIP\C6192.MP4': Metadata: major_brand : XAVC minor_version : 16785407 compatible_brands: XAVCmp42iso2 creation_time : 2022-11-29T13:30:09.000000Z Duration: 00:00:12.96, start: 0.000000, bitrate: 62225 kb/s Stream #0:0[0x1](und): Video: h264 (High 4:2:2) (avc1 / 0x31637661), yuv422p10le(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 46909 kb/s, 50 fps, 50 tbr, 50k tbn (default) Metadata: creation_time : 2022-11-29T13:30:09.000000Z handler_name : Video Media Handler vendor_id : [0][0][0][0] encoder : AVC Coding Stream #0:1[0x2](und): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s16, 1536 kb/s (default) Metadata: creation_time : 2022-11-29T13:30:09.000000Z handler_name : Sound Media Handler vendor_id : [0][0][0][0] Stream #0:2[0x3](und): Data: none (rtmd / 0x646D7472), 4505 kb/s (default) Metadata: creation_time : 2022-11-29T13:30:09.000000Z handler_name : Timed Metadata Media Handler timecode : 00:25:17:38 Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (pcm_s16be (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help [libx264 @ 000002ab3263e700] using SAR=1/1 [libx264 @ 000002ab3263e700] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @ 000002ab3263e700] profile High 4:2:2 Intra, level 4.1, 4:2:2, 10-bit Output #0, mxf, to 'testavcinterlaced3.mxf': Metadata: major_brand : XAVC minor_version : 16785407 compatible_brands: XAVCmp42iso2 encoder : Lavf59.27.100 Stream #0:0(und): Video: h264, yuv422p10le(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbn (default) Metadata: creation_time : 2022-11-29T13:30:09.000000Z handler_name : Video Media Handler vendor_id : [0][0][0][0] encoder : Lavc59.37.100 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A Stream #0:1(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default) Metadata: creation_time : 2022-11-29T13:30:09.000000Z handler_name : Sound Media Handler vendor_id : [0][0][0][0] encoder : Lavc59.37.100 pcm_s16le frame= 326 fps= 33 q=-1.0 Lsize= 182905kB time=00:00:13.04 bitrate=114904.8kbits/s dup=0 drop=322 speed=1.32x video:181093kB audio:2430kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [libx264 @ 000002ab3263e700] frame I:326 Avg QP:16.76 size:568832 [libx264 @ 000002ab3263e700] mb I I16..4: 0.0% 100.0% 0.0% [libx264 @ 000002ab3263e700] field mbs: intra: 0.0% [libx264 @ 000002ab3263e700] 8x8 transform intra:100.0% [libx264 @ 000002ab3263e700] coded y,uvDC,uvAC intra: 99.9% 100.0% 94.3% [libx264 @ 000002ab3263e700] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 14% 24% 7% 8% 8% 8% 9% 12% [libx264 @ 000002ab3263e700] i8c dc,h,v,p: 53% 13% 19% 15% [libx264 @ 000002ab3263e700] kb/s:113766.41 Phillip Barnett Server Manager [separator] [contact-icons phone] +44 207 430 4474 [contact-icons email] phillip.barnett(a)itn.co.uk [contact-icons location] 200 Gray's Inn Road | London | UK | WC1X 8XZ [bottom-logo] [bottom-logo-line] Independent Television News Limited is registered in England and Wales with company number 548648 and its registered office is at 200 Gray's Inn Road, London WC1X 8XZ. Please Note: Any views or opinions are solely those of the author and do not necessarily represent those of Independent Television News Limited unless specifically stated. This email and any files attached are confidential and intended solely for the use of the individual or entity to which they are addressed. If you have received this email in error, please notify postmaster(a)itn.co.uk Please note that to ensure regulatory compliance and for the protection of our clients and business, we may monitor and read messages sent to and from our systems.

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Extract chapter names to a text file?
by MyCraigs List 10 Dec '22

10 Dec '22

What is the command to extract all of the chapter names from a video and then have them saved in a text file? I only want each chapter name, one name per line, and nothing else. Thanks, Craig Sent from Yahoo Mail on Android

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Re: [FFmpeg-user] Trouble selecting a pixel format/colorspace while trying to encode a video using ffmpeg and HW accelerated vaapi or qsv interfaces
by Chen, Wenbin 09 Dec '22

09 Dec '22

> > Output of 'ffmpeg -h filter=vpp_qsv' is bellow > > > > ==== > > Filter vpp_qsv > > Quick Sync Video VPP. > > Inputs: > > #0: default (video) > > Outputs: > > #0: default (video) > > vpp_qsv AVOptions: > > deinterlace <int> ..FV....... deinterlace mode: 0=off, 1=bob, > > 2=advanced (from 0 to 2) (default 0) > > bob 1 ..FV....... Bob deinterlace mode. > > advanced 2 ..FV....... Advanced deinterlace mode. > > denoise <int> ..FV....... denoise level [0, 100] (from 0 > > to 100) (default 0) > > detail <int> ..FV....... enhancement level [0, 100] (from > > 0 to 100) (default 0) > > framerate <rational> ..FV....... output framerate (from 0 to > > DBL_MAX) (default 0/1) > > procamp <int> ..FV....... Enable ProcAmp (from 0 to 1) > > (default 0) > > hue <float> ..FV....... ProcAmp hue (from -180 to 180) > > (default 0) > > saturation <float> ..FV....... ProcAmp saturation (from 0 to > > 10) (default 1) > > contrast <float> ..FV....... ProcAmp contrast (from 0 to 10) > > (default 1) > > brightness <float> ..FV....... ProcAmp brightness (from -100 to > > 100) (default 0) > > transpose <int> ..FV....... set transpose direction (from -1 > > to 6) (default -1) > > cclock_hflip 0 ..FV....... rotate counter-clockwise with > > horizontal flip > > clock 1 ..FV....... rotate clockwise > > cclock 2 ..FV....... rotate counter-clockwise > > clock_hflip 3 ..FV....... rotate clockwise with horizontal > > flip > > reversal 4 ..FV....... rotate by half-turn > > hflip 5 ..FV....... flip horizontally > > vflip 6 ..FV....... flip vertically > > cw <string> ..FV....... set the width crop area > > expression (default "iw") > > ch <string> ..FV....... set the height crop area > > expression (default "ih") > > cx <string> ..FV....... set the x crop area expression > > (default "(in_w-out_w)/2") > > cy <string> ..FV....... set the y crop area expression > > (default "(in_h-out_h)/2") > > w <string> ..FV....... Output video width (default > > "cw") > > width <string> ..FV....... Output video width (default > > "cw") > > h <string> ..FV....... Output video height (default > > "w*ch/cw") > > height <string> ..FV....... Output video height (default > > "w*ch/cw") > > format <string> ..FV....... Output pixel format (default > > "same") > > async_depth <int> ..FV....... Internal parallelization depth, > > the higher the value the higher the latency. (from 0 to INT_MAX) (default 0) > > scale_mode <int> ..FV....... scale mode: 0=auto, 1=low power, > > 2=high quality (from 0 to 2) (default 0) > > ==== > > > > I tried the following command with vpp_qsv filter but pixel > format/colorspace > > of the output is the same: > > > > ==== > > ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -v verbose -f x11grab > > -draw_mouse 0 -framerate 20 -probesize 42M -video_size 1920x1200 > > -thread_queue_size 1000 -vcodec rawvideo -i ":0.0" -an -vf > > 'hwupload=extra_hw_frames=64,vpp_qsv=format=bgra' -c:v hevc_qsv - > preset > > veryslow -global_quality 17 -look_ahead 1 -y /tmp/output.mkv > > ==== > > > > The ffprobe result for the above command is: > > > > ==== > > Input #0, matroska,webm, from '/tmp/output.mkv': > > Metadata: > > ENCODER : Lavf59.27.100 > > Duration: 00:00:04.85, start: 0.000000, bitrate: 50 kb/s > > Stream #0:0: Video: hevc (Main), yuvj420p(pc, gbr/unknown/unknown, > > progressive), 1920x1200 [SAR 1:1 DAR 8:5], 20 fps, 20 tbr, 1k tbn > > Metadata: > > ENCODER : Lavc59.37.100 hevc_qsv > > DURATION : 00:00:04.850000000 > > ==== > > > > On Thu, 8 Dec 2022 at 17:06, Dennis Mungai <dmngaie(a)gmail.com> wrote: In case of RGB input, VPL/MSDK uses 420 chroma format as default for the purpose of backward compatibility. I will send patch to enable 444 encoding for RGB input, then you can get the same output as libx265 SW. Thanks Wenbin > > > > > Hey there, > > > > > > I'd recommend using the vpp_qsv filter instead. > > > > > > Please provide the output of: > > > > > > ffmpeg -h filter=vpp_qsv > > > > > > And I'll generate a command line you can use to test and report back. > > _______________________________________________ > > ffmpeg-user mailing list > > ffmpeg-user(a)ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > ffmpeg-user-request(a)ffmpeg.org with subject "unsubscribe".

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