[FFmpeg-trac] #9269(undetermined:new): ffmpeg produces broken files when cutting mp4s
FFmpeg
trac at avcodec.org
Fri May 28 23:55:28 EEST 2021
#9269: ffmpeg produces broken files when cutting mp4s
-------------------------------------+-------------------------------------
Reporter: Artem S. | Owner: (none)
Tashkinov |
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Description changed by Artem S. Tashkinov:
Old description:
> Summary of the bug: when fast seeking along with specifying the length,
> ffmpeg produces files with broken PTS timestamps.
>
> How to reproduce:
> {{{
> /tmp/ffmpeg/ffmpeg -ss 00:01:00 -i "source.mp4" -t 10 -c copy
> /tmp/100-10.mp4
> ffmpeg version N-102619-gebedd26eef Copyright (c) 2000-2021 the FFmpeg
> developers
> built with gcc 10 (GCC)
> configuration: --disable-static --enable-nonfree --enable-avfilter
> --disable-shared --enable-static --enable-gpl --enable-postproc --enable-
> pthreads --enable-libspeex --enable-libmp3lame --enable-libx264 --enable-
> libxvid --enable-libopus --enable-libopenjpeg --disable-debug --disable-
> doc --enable-libpulse --extra-cflags='-mtune=generic' --enable-version3
> --enable-libvorbis --enable-libfdk-aac --enable-gnutls --enable-
> libfreetype --enable-libx265 --enable-libdav1d --libdir=/usr/local/lib64
> --enable-lto --enable-pic --prefix=/tmp/ffmpeg
> libavutil 57. 0.100 / 57. 0.100
> libavcodec 59. 1.100 / 59. 1.100
> libavformat 59. 2.101 / 59. 2.101
> libavdevice 59. 0.100 / 59. 0.100
> libavfilter 8. 0.101 / 8. 0.101
> libswscale 6. 0.100 / 6. 0.100
> libswresample 4. 0.100 / 4. 0.100
> libpostproc 56. 0.100 / 56. 0.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'source.mp4':
> Metadata:
> major_brand : mp42
> minor_version : 0
> compatible_brands: isommp42
> Duration: 00:02:30.14, start: 0.000000, bitrate: 17106 kb/s
> Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p,
> 1920x1080, 16995 kb/s, SAR 1:1 DAR 16:9, 29.85 fps, 29.85 tbr, 90k tbn
> (default)
> Metadata:
> handler_name : VideoHandle
> vendor_id : [0][0][0][0]
> Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono,
> fltp, 96 kb/s (default)
> Metadata:
> handler_name : SoundHandle
> vendor_id : [0][0][0][0]
> Output #0, mp4, to '/tmp/100-10.mp4':
> Metadata:
> major_brand : mp42
> minor_version : 0
> compatible_brands: isommp42
> encoder : Lavf59.2.101
> Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p,
> 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 16995 kb/s, 29.85 fps, 29.85 tbr,
> 90k tbn (default)
> Metadata:
> handler_name : VideoHandle
> vendor_id : [0][0][0][0]
> Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono,
> fltp, 96 kb/s (default)
> Metadata:
> handler_name : SoundHandle
> vendor_id : [0][0][0][0]
> Stream mapping:
> Stream #0:0 -> #0:0 (copy)
> Stream #0:1 -> #0:1 (copy)
> Press [q] to stop, [?] for help
> frame= 323 fps=0.0 q=-1.0 Lsize= 22611kB time=00:00:10.01
> bitrate=18499.6kbits/s speed=1.12e+03x
> video:22473kB audio:127kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 0.046347%
> }}}
>
> Tested with ffmpeg-4.4 and the current ffmpeg snapshot.
>
> Also discussed here: https://github.com/mpv-player/mpv/issues/8876
>
> The resulting files produced by ffmpeg:
>
> 4.4 https://drive.google.com/file/d/1hdK51zO0ANLjIX9bC_OVd-
> jBv7_ReLbH/view?usp=sharing
>
> GIT: https://drive.google.com/file/d/1AWnpx3xgf7g-
> oiYLE3HGzlRouXe6Ea4T/view?usp=sharing
>
> Using slow seeking (-i timestamp after the source file) fixes the issue.
New description:
Summary of the bug: when fast seeking along with specifying the length,
ffmpeg produces files with broken PTS timestamps.
How to reproduce:
{{{
/tmp/ffmpeg/ffmpeg -ss 00:01:00 -i "source.mp4" -t 10 -c copy
/tmp/100-10.mp4
ffmpeg version N-102619-gebedd26eef Copyright (c) 2000-2021 the FFmpeg
developers
built with gcc 10 (GCC)
configuration: --disable-static --enable-nonfree --enable-avfilter
--disable-shared --enable-static --enable-gpl --enable-postproc --enable-
pthreads --enable-libspeex --enable-libmp3lame --enable-libx264 --enable-
libxvid --enable-libopus --enable-libopenjpeg --disable-debug --disable-
doc --enable-libpulse --extra-cflags='-mtune=generic' --enable-version3
--enable-libvorbis --enable-libfdk-aac --enable-gnutls --enable-
libfreetype --enable-libx265 --enable-libdav1d --libdir=/usr/local/lib64
--enable-lto --enable-pic --prefix=/tmp/ffmpeg
libavutil 57. 0.100 / 57. 0.100
libavcodec 59. 1.100 / 59. 1.100
libavformat 59. 2.101 / 59. 2.101
libavdevice 59. 0.100 / 59. 0.100
libavfilter 8. 0.101 / 8. 0.101
libswscale 6. 0.100 / 6. 0.100
libswresample 4. 0.100 / 4. 0.100
libpostproc 56. 0.100 / 56. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'source.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
Duration: 00:02:30.14, start: 0.000000, bitrate: 17106 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p,
1920x1080, 16995 kb/s, SAR 1:1 DAR 16:9, 29.85 fps, 29.85 tbr, 90k tbn
(default)
Metadata:
handler_name : VideoHandle
vendor_id : [0][0][0][0]
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono,
fltp, 96 kb/s (default)
Metadata:
handler_name : SoundHandle
vendor_id : [0][0][0][0]
Output #0, mp4, to '/tmp/100-10.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
encoder : Lavf59.2.101
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p,
1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 16995 kb/s, 29.85 fps, 29.85 tbr,
90k tbn (default)
Metadata:
handler_name : VideoHandle
vendor_id : [0][0][0][0]
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono,
fltp, 96 kb/s (default)
Metadata:
handler_name : SoundHandle
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 323 fps=0.0 q=-1.0 Lsize= 22611kB time=00:00:10.01
bitrate=18499.6kbits/s speed=1.12e+03x
video:22473kB audio:127kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.046347%
}}}
Tested with ffmpeg-4.4 and the current ffmpeg snapshot.
Also discussed here: https://github.com/mpv-player/mpv/issues/8876
The resulting files produced by ffmpeg:
4.4 https://drive.google.com/file/d/1hdK51zO0ANLjIX9bC_OVd-
jBv7_ReLbH/view?usp=sharing
GIT: https://drive.google.com/file/d/1AWnpx3xgf7g-
oiYLE3HGzlRouXe6Ea4T/view?usp=sharing
Using slow seeking (-ss timestamp after the source file) fixes the issue.
--
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9269#comment:1>
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