#10606: ffplay ignores relative audio delay tag
-------------------------------------+----------------------------------
Reporter: Ulf Zibis | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: ffplay
Version: unspecified | Resolution:
Keywords: audio | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+----------------------------------
Description changed by Ulf Zibis:
Old description:
> Summary of the bug:
> How to reproduce:
> {{{
> $ ffmpeg -ss 27.83 -t 2:06:32.44 -i Ton_fr.mkv -c:a copy Ton_fr_cut.mkv
> ffmpeg version 5.1.1-1ubuntu2.1 Copyright (c) 2000-2022 the FFmpeg
> developers
> built with gcc 12 (Ubuntu 12.2.0-3ubuntu1)
> configuration: --prefix=/usr --extra-version=1ubuntu2.1
> --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
> --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
> --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
> --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
> --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite
> --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
> libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-
> libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
> --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist
> --enable-librubberband --enable-libshine --enable-libsnappy --enable-
> libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-
> libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab
> --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265
> --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq
> --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-
> opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-
> pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394
> --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
> --enable-libx264 --enable-libplacebo --enable-shared
> 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
> Input #0, matroska,webm, from 'Ton_fr.mkv':
> Metadata:
> ENCODER : Lavf59.27.100
> Duration: 02:14:57.56, start: 0.000000, bitrate: 2853 kb/s
> Stream #0:0: Video: h264 (High 4:4:4 Predictive), gbrp(pc,
> gbr/unknown/unknown, progressive), 210x110 [SAR 1:1 DAR 21:11], 25 fps,
> 25 tbr, 1k tbn
> Metadata:
> DURATION : 02:14:57,480000000
> Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp
> Metadata:
> DURATION : 02:14:57,557000000
> Stream mapping:
> Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
> Stream #0:1 -> #0:1 (copy)
> Press [q] to stop, [?] for help
> [libx264 @ 0x5647083b6ac0] using SAR=1/1
> [libx264 @ 0x5647083b6ac0] using cpu capabilities: MMX2 SSE2Fast SSSE3
> SSE4.1 Cache64
> [libx264 @ 0x5647083b6ac0] profile High 4:4:4 Predictive, level 1.1,
> 4:4:4, 8-bit
> [libx264 @ 0x5647083b6ac0] 264 - core 164 r3095 baee400 - H.264/MPEG-4
> AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html -
> options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7
> psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
> 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=3
> lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0
> bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
> b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25
> scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0
> qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
> Output #0, matroska, to 'Ton_fr_cut.mkv':
> Metadata:
> encoder : Lavf59.27.100
> Stream #0:0: Video: h264 (H264 / 0x34363248), yuv444p(tv, progressive),
> 210x110 [SAR 1:1 DAR 21:11], q=2-31, 25 fps, 1k tbn
> Metadata:
> DURATION : 02:14:57,480000000
> 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: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz,
> stereo, fltp
> Metadata:
> DURATION : 02:14:57,557000000
> frame=189811 fps=367 q=-1.0 Lsize= 208409kB time=02:06:32.45 bitrate=
> 224.9kbits/s speed=14.7x
> video:54887kB audio:149809kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 1.814429%
> [libx264 @ 0x5647083b6ac0] frame I:1641 Avg QP:20.10 size: 4034
> [libx264 @ 0x5647083b6ac0] frame P:84383 Avg QP:23.19 size: 462
> [libx264 @ 0x5647083b6ac0] frame B:103787 Avg QP:24.76 size: 102
> [libx264 @ 0x5647083b6ac0] consecutive B-frames: 20.9% 14.7% 11.5% 52.9%
> [libx264 @ 0x5647083b6ac0] mb I I16..4: 6.7% 50.8% 42.5%
> [libx264 @ 0x5647083b6ac0] mb P I16..4: 0.4% 1.3% 0.6% P16..4: 20.3%
> 12.3% 8.4% 0.0% 0.0% skip:56.7%
> [libx264 @ 0x5647083b6ac0] mb B I16..4: 0.1% 0.2% 0.1% B16..8: 17.2%
> 3.2% 0.9% direct: 1.0% skip:77.4% L0:38.4% L1:50.2% BI:11.4%
> [libx264 @ 0x5647083b6ac0] 8x8 transform intra:54.4% inter:56.3%
> [libx264 @ 0x5647083b6ac0] coded y,u,v intra: 63.6% 34.5% 31.5% inter:
> 9.2% 1.8% 1.4%
> [libx264 @ 0x5647083b6ac0] i16 v,h,dc,p: 52% 28% 8% 12%
> [libx264 @ 0x5647083b6ac0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 21% 22% 4%
> 5% 5% 6% 6% 7%
> [libx264 @ 0x5647083b6ac0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 21% 14% 5%
> 6% 7% 6% 6% 6%
> [libx264 @ 0x5647083b6ac0] Weighted P-Frames: Y:4.8% UV:1.4%
> [libx264 @ 0x5647083b6ac0] ref P L0: 66.9% 13.8% 12.2% 6.7% 0.5%
> [libx264 @ 0x5647083b6ac0] ref B L0: 88.1% 8.4% 3.5%
> [libx264 @ 0x5647083b6ac0] ref B L1: 97.1% 2.9%
> [libx264 @ 0x5647083b6ac0] kb/s:59.22
> }}}
> `ffplay` outputs the audio at the beginning of the video with ~7 sec.
> delay, but from 00:00:23 to end, the sync is correct.
> {{{
> $ ffplay Ton_fr_cut.mkv
> ffplay version 5.1.1-1ubuntu2.1 Copyright (c) 2003-2022 the FFmpeg
> developers
> built with gcc 12 (Ubuntu 12.2.0-3ubuntu1)
> configuration: --prefix=/usr --extra-version=1ubuntu2.1
> --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
> --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
> --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
> --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
> --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite
> --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
> libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-
> libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
> --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist
> --enable-librubberband --enable-libshine --enable-libsnappy --enable-
> libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-
> libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab
> --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265
> --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq
> --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-
> opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-
> pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394
> --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
> --enable-libx264 --enable-libplacebo --enable-shared
> 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
> [matroska,webm @ 0x7fe7d0000c80] Could not find codec parameters for
> stream 0 (Video: h264, none(tv, progressive), 210x110): unspecified pixel
> format
> Consider increasing the value for the 'analyzeduration' (0) and
> 'probesize' (5000000) options
> Input #0, matroska,webm, from 'Ton_fr_cut.mkv':
> Metadata:
> ENCODER : Lavf59.27.100
> Duration: 02:06:40.28, start: 0.000000, bitrate: 224 kb/s
> Stream #0:0: Video: h264, none(tv, progressive), 210x110, SAR 1:1 DAR
> 21:11, 25 fps, 25 tbr, 1k tbn
> Metadata:
> ENCODER : Lavc59.37.100 libx264
> DURATION : 02:06:40.259000000
> Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp
> Metadata:
> DURATION : 02:06:40.277000000
> 62.32 A-V: -0.006 fd= 0 aq= 20KB vq= 2KB sq= 0B f=201/0
> }}}
>
> With the mpv media player as alternative the sync between audio and video
> is correct from the beginning.
>
> The audio delay is confirmed by `mediainfo`:
> {{{
> $ mediainfo Ton_fr_cut.mkv
> [.....]
> Audio
> ID : 2
> Format : AAC LC
> Format/Info : Advanced Audio Codec Low
> Complexity
> Codec ID : A_AAC-2
> Duration : 2 h 6 min
> Channel(s) : 2 channels
> Channel layout : L R
> Sampling rate : 48.0 kHz
> Frame rate : 46.875 FPS (1024 SPF)
> Compression mode : Lossy
> Delay relative to video : -7 s 819 ms
> Default : No
> Forced : No
> }}}
> The input file was created by `simplescreenrecorder` which uses FFmpeg in
> behind. I used the `libx264rgb` encoder with bit rate 0 and options
> "`crf=0,preset=ultrafast`".
New description:
Summary of the bug:
How to reproduce:
{{{
$ ffmpeg -ss 27.83 -t 1:30 -i Ton_fr.mkv -c:a copy Ton_fr_cut.mkv
ffmpeg version 5.1.1-1ubuntu2.1 Copyright (c) 2000-2022 the FFmpeg
developers
built with gcc 12 (Ubuntu 12.2.0-3ubuntu1)
configuration: --prefix=/usr --extra-version=1ubuntu2.1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-
libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
--enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist
--enable-librubberband --enable-libshine --enable-libsnappy --enable-
libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-
libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265
--enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq
--enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
--enable-opengl --enable-sdl2 --disable-sndio --enable-pocketsphinx
--enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm
--enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264
--enable-libplacebo --enable-shared
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
Input #0, matroska,webm, from 'Ton_fr.mkv':
Metadata:
ENCODER : Lavf59.27.100
Duration: 02:14:57.56, start: 0.000000, bitrate: 2853 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Predictive), gbrp(pc,
gbr/unknown/unknown, progressive), 210x110 [SAR 1:1 DAR 21:11], 25 fps, 25
tbr, 1k tbn
Metadata:
DURATION : 02:14:57,480000000
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp
Metadata:
DURATION : 02:14:57,557000000
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264 @ 0x5586cbc62ac0] using SAR=1/1
[libx264 @ 0x5586cbc62ac0] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.1 Cache64
[libx264 @ 0x5586cbc62ac0] profile High 4:4:4 Predictive, level 1.1,
4:4:4, 8-bit
[libx264 @ 0x5586cbc62ac0] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options:
cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=3
lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25
scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0
qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'Ton_fr_cut.mkv':
Metadata:
encoder : Lavf59.27.100
Stream #0:0: Video: h264 (H264 / 0x34363248), yuv444p(tv, progressive),
210x110 [SAR 1:1 DAR 21:11], q=2-31, 25 fps, 1k tbn
Metadata:
DURATION : 02:14:57,480000000
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: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz,
stereo, fltp
Metadata:
DURATION : 02:14:57,557000000
frame= 2250 fps=385 q=-1.0 Lsize= 2361kB time=00:01:30.01 bitrate=
214.8kbits/s speed=15.4x
video:654kB audio:1660kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 2.018668%
[libx264 @ 0x5586cbc62ac0] frame I:64 Avg QP:21.90 size: 2203
[libx264 @ 0x5586cbc62ac0] frame P:859 Avg QP:22.24 size: 452
[libx264 @ 0x5586cbc62ac0] frame B:1327 Avg QP:23.85 size: 105
[libx264 @ 0x5586cbc62ac0] consecutive B-frames: 16.6% 10.2% 12.4% 60.8%
[libx264 @ 0x5586cbc62ac0] mb I I16..4: 11.7% 66.7% 21.6%
[libx264 @ 0x5586cbc62ac0] mb P I16..4: 2.7% 4.1% 1.3% P16..4: 17.8%
11.6% 7.0% 0.0% 0.0% skip:55.4%
[libx264 @ 0x5586cbc62ac0] mb B I16..4: 0.1% 0.5% 0.1% B16..8: 17.4%
2.3% 0.5% direct: 1.1% skip:78.1% L0:40.7% L1:51.1% BI: 8.2%
[libx264 @ 0x5586cbc62ac0] 8x8 transform intra:58.8% inter:62.1%
[libx264 @ 0x5586cbc62ac0] coded y,u,v intra: 43.6% 37.8% 36.4% inter:
6.4% 2.3% 1.7%
[libx264 @ 0x5586cbc62ac0] i16 v,h,dc,p: 63% 17% 9% 12%
[libx264 @ 0x5586cbc62ac0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 20% 27% 4%
5% 4% 6% 4% 5%
[libx264 @ 0x5586cbc62ac0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 19% 18% 4%
5% 4% 6% 4% 5%
[libx264 @ 0x5586cbc62ac0] Weighted P-Frames: Y:12.6% UV:3.1%
[libx264 @ 0x5586cbc62ac0] ref P L0: 60.7% 15.1% 15.2% 8.0% 0.9%
[libx264 @ 0x5586cbc62ac0] ref B L0: 84.0% 12.6% 3.4%
[libx264 @ 0x5586cbc62ac0] ref B L1: 95.9% 4.1%
[libx264 @ 0x5586cbc62ac0] kb/s:59.44
}}}
`ffplay` outputs the audio at the beginning of the video with ~7 sec.
delay, but from 00:00:23 to end, the sync is correct.
{{{
$ ffplay Ton_fr_cut.mkv
ffplay version 5.1.1-1ubuntu2.1 Copyright (c) 2003-2022 the FFmpeg
developers
built with gcc 12 (Ubuntu 12.2.0-3ubuntu1)
configuration: --prefix=/usr --extra-version=1ubuntu2.1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-
libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
--enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist
--enable-librubberband --enable-libshine --enable-libsnappy --enable-
libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-
libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265
--enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq
--enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
--enable-opengl --enable-sdl2 --disable-sndio --enable-pocketsphinx
--enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm
--enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264
--enable-libplacebo --enable-shared
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
[matroska,webm @ 0x7fe3d4000c80] Could not find codec parameters for
stream 0 (Video: h264, none(tv, progressive), 210x110): unspecified pixel
format
Consider increasing the value for the 'analyzeduration' (0) and
'probesize' (5000000) options
Input #0, matroska,webm, from 'Ton_fr_cut.mkv':
Metadata:
ENCODER : Lavf59.27.100
Duration: 00:01:37.83, start: 0.000000, bitrate: 197 kb/s
Stream #0:0: Video: h264, none(tv, progressive), 210x110, SAR 1:1 DAR
21:11, 25 fps, 25 tbr, 1k tbn
Metadata:
ENCODER : Lavc59.37.100 libx264
DURATION : 00:01:37.819000000
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp
Metadata:
DURATION : 00:01:37.834000000
37.48 A-V: -0.022 fd= 0 aq= 21KB vq= 3KB sq= 0B f=132/0
}}}
With the mpv media player as alternative the sync between audio and video
is correct from the beginning.
The audio delay is confirmed by `mediainfo`:
{{{
$ mediainfo Ton_fr_cut.mkv
[.....]
Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low
Complexity
Codec ID : A_AAC-2
Duration : 1 min 37 s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Delay relative to video : -7 s 819 ms
Default : No
Forced : No
}}}
I'm too wondering about:
- I used `-t 1:30`, but the result is `1:37`.
- ffmpeg states a duration of `02:14:57` for the output:
The input file was created by `simplescreenrecorder` which uses FFmpeg in
behind. I used the `libx264rgb` encoder with bit rate 0 and options
"`crf=0,preset=ultrafast`".
--
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10606#comment:1>
FFmpeg <https://ffmpeg.org>
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