[FFmpeg-trac] #9269(undetermined:new): ffmpeg produces broken files when cutting mp4s
FFmpeg
trac at avcodec.org
Fri May 28 22:50:35 EEST 2021
#9269: ffmpeg produces broken files when cutting mp4s
-------------------------------------+-------------------------------------
Reporter: Artem S. | Type: defect
Tashkinov |
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
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.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9269>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list