[FFmpeg-trac] #3903(ffmpeg:new): Cutting video file with invalid start time does not warn and produces invalid file

FFmpeg trac at avcodec.org
Wed Aug 27 22:23:26 CEST 2014


#3903: Cutting video file with invalid start time does not warn and produces
invalid file
--------------------------------------+----------------------------------
             Reporter:  ahthovaikied  |                    Owner:
                 Type:  enhancement   |                   Status:  new
             Priority:  normal        |                Component:  ffmpeg
              Version:  git-master    |               Resolution:
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
--------------------------------------+----------------------------------

Comment (by ahthovaikied):

 {{{
 $ curl -s
 http://www.auby.no/files/video_tests/h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv
 > ref.mkv
 $ ffmpeg -i ref.mkv -ss 10:00:00 -t 00:00:10 -map 0 -c:v copy -c:a copy -f
 matroska out.mkv
 ffmpeg version N-65928-g7997d78 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Aug 27 2014 20:45:49 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
   configuration: --enable-gpl --enable-version3 --enable-nonfree
 --disable-runtime-cpudetect --disable-ffserver --disable-ffplay --disable-
 encoders --disable-decoders --disable-filters --disable-debug --cpu=corei7
   libavutil      54.  7.100 / 54.  7.100
   libavcodec     56.  0.101 / 56.  0.101
   libavformat    56.  3.100 / 56.  3.100
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  0.103 /  5.  0.103
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 [matroska,webm @ 0xe7fca0] Could not find codec parameters for stream 2
 (Audio: mp3, 48000 Hz, 2 channels, 160 kb/s): unspecified frame size
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 Guessed Channel Layout for  Input Stream #0.1 : stereo
 Guessed Channel Layout for  Input Stream #0.2 : stereo
 Input #0, matroska,webm, from 'ref.mkv':
   Metadata:
     title           : Harry Potter 4[Eng-Hindi]Dual.Audio BRRIP
 720p-=[champ_is_here]=-
     encoder         : libebml v1.0.0 + libmatroska v1.0.0
     creation_time   : 2011-01-07 07:42:53
   Duration: 00:00:57.61, start: 0.000000, bitrate: 613 kb/s
     Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x528 [SAR 1:1 DAR
 80:33], 25 fps, 25 tbr, 1k tbn, 47.95 tbc
     Metadata:
       title           : -=[champ_is_here]=-
     Stream #0:1(eng): Audio: aac, 48000 Hz, 2 channels
     Metadata:
       title           : -=[champ_is_here]=-
     Stream #0:2(hin): Audio: mp3, 48000 Hz, 2 channels, 160 kb/s
     Metadata:
       title           : -=[champ_is_here]=-
 Output #0, matroska, to 'out.mkv':
   Metadata:
     title           : Harry Potter 4[Eng-Hindi]Dual.Audio BRRIP
 720p-=[champ_is_here]=-
     encoder         : Lavf56.3.100
     Stream #0:0(eng): Video: h264 (H264 / 0x34363248), yuv420p, 1280x528
 [SAR 1:1 DAR 80:33], q=2-31, 25 fps, 1k tbn, 1k tbc
     Metadata:
       title           : -=[champ_is_here]=-
     Stream #0:1(eng): Audio: aac ([255][0][0][0] / 0x00FF), 48000 Hz,
 stereo
     Metadata:
       title           : -=[champ_is_here]=-
     Stream #0:2(hin): Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo,
 160 kb/s
     Metadata:
       title           : -=[champ_is_here]=-
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
   Stream #0:2 -> #0:2 (copy)
 Press [q] to stop, [?] for help
 frame=    0 fps=0.0 q=-1.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A
 video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

 Just for information, FFprobe output:
 {{{
 $ ffprobe out.mkv
 ffprobe version n2.3.3 Copyright (c) 2007-2014 the FFmpeg developers
   built on Aug 19 2014 21:00:06 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
   configuration: --enable-gpl --enable-version3 --enable-nonfree
 --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis
 --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-
 libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-
 libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-
 libvpx --enable-libx264 --enable-libxvid --disable-debug --extra-libs=-ldl
 --cpu=corei7
   libavutil      52. 92.100 / 52. 92.100
   libavcodec     55. 69.100 / 55. 69.100
   libavformat    55. 48.100 / 55. 48.100
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.100 /  4. 11.100
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 [matroska,webm @ 0x18e5080] Unknown entry 0x81
 [matroska,webm @ 0x18e5080] Read error at pos. 175 (0xaf)
 [matroska,webm @ 0x18e5080] Unknown entry 0x82
     Last message repeated 1 times
 Truncating packet of size 16777216 to 880
 out.mkv: End of file
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3903#comment:2>
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