[FFmpeg-trac] #8464(undetermined:new): `outpoint` directive of `concat` demuxer may be off by 1 frame

FFmpeg trac at avcodec.org
Wed Jan 8 01:43:24 EET 2020


#8464: `outpoint` directive of `concat` demuxer may be off by 1 frame
-------------------------------------+-------------------------------------
             Reporter:  gdgsdg123    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 X.txt:
 {{{
 file 'merge.avi'
 inpoint 87.05
 outpoint 88.116667
 }}}
 [[BR]]
 {{{
 ffmpeg -y -f concat -safe 0 -i "X.txt" -c copy "temp.avi"
 }}}
 {{{
 ffmpeg version git-2020-01-02-81172b5 Copyright (c) 2000-2020 the FFmpeg
 developers
   built with gcc 9.2.1 (GCC) 20191125
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
 libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
 --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
 libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx
 --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc
 --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 --enable-amf
   libavutil      56. 38.100 / 56. 38.100
   libavcodec     58. 65.102 / 58. 65.102
   libavformat    58. 35.101 / 58. 35.101
   libavdevice    58.  9.102 / 58.  9.102
   libavfilter     7. 70.101 /  7. 70.101
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 [avi @ 00000000003ca900] decoding for stream 0 failed
 Input #0, concat, from 'X.txt':
   Duration: 00:00:01.07, bitrate: 0 kb/s
     Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248),
 gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, 377584 kb/s, 60
 fps, 30 tbr, 60 tbn, 120 tbc
 Output #0, avi, to 'temp.avi':
   Metadata:
     ISFT            : Lavf58.35.101
     Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248),
 gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, q=2-31, 377584
 kb/s, 60 fps, 30 tbr, 60 tbn, 60 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 [avi @ 00000000003cf100] Timestamps are unset in a packet for stream 0.
 This is deprecated and will stop working in the future. Fix your code to
 set the timestamps properly
 frame=   33 fps=0.0 q=-1.0 Lsize=   96767kB time=00:00:01.08
 bitrate=731740.7kbits/s speed=8.74x
 video:96760kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.007367%
 }}}
 The frame at `outpoint` is included, while according to the
 [http://ffmpeg.org/ffmpeg-formats.html#concat documentation] it
 shouldn't... And the behavior is inconsistent with different timestamp
 values.
 [[BR]]
 [[BR]]
 {{{
 ffmpeg -ss 87.05 -to 88.116667 -i "merge.avi" -an -c copy "to.avi"
 }}}
 {{{
 ffmpeg version git-2020-01-02-81172b5 Copyright (c) 2000-2020 the FFmpeg
 developers
   built with gcc 9.2.1 (GCC) 20191125
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
 libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
 --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
 libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx
 --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc
 --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 --enable-amf
   libavutil      56. 38.100 / 56. 38.100
   libavcodec     58. 65.102 / 58. 65.102
   libavformat    58. 35.101 / 58. 35.101
   libavdevice    58.  9.102 / 58.  9.102
   libavfilter     7. 70.101 /  7. 70.101
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 [avi @ 00000000006504c0] decoding for stream 0 failed
 Input #0, avi, from 'merge.avi':
   Metadata:
     encoder         : Lavf58.29.100
   Duration: 00:05:24.67, start: 0.000000, bitrate: 377573 kb/s
     Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248),
 gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, 377584 kb/s, 60
 fps, 30 tbr, 60 tbn, 120 tbc
 Output #0, avi, to 'to.avi':
   Metadata:
     ISFT            : Lavf58.35.101
     Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248),
 gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, q=2-31, 377584
 kb/s, 60 fps, 30 tbr, 60 tbn, 60 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 [avi @ 000000000315c900] Timestamps are unset in a packet for stream 0.
 This is deprecated and will stop working in the future. Fix your code to
 set the timestamps properly
 frame=   32 fps=0.0 q=-1.0 Lsize=   93969kB time=00:00:01.05
 bitrate=733139.1kbits/s speed=9.13x
 video:93962kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.007536%
 }}}
 This approach seemed to produce a reliable output with various `-to`
 values tried. (not intensively tested)
 [[BR]]
 [[BR]]
 [[BR]]
 [[BR]]
 For obvious reason I'm not gonna upload the "merge.avi"... But I believe
 the problem can be reproduced with different input and timestamp values.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8464>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


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