[FFmpeg-trac] #1979(FFmpeg:new): Automatically set -fflags +genpts

[FFmpeg]

#1979: Automatically set -fflags +genpts
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:  FFmpeg
               Priority:  wish       |               Keywords:
                Version:  git-       |  av_interleaved_write_frame
  master                             |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 Several tickets were opened by users who saw one of the following error
 messages when trying to remux: "first pts value must set" or "Can't write
 packet with unknown timestamp"
 With the sample from ticket #1553:
 {{{
 $ ffmpeg -i Ts\ cannot\ be\ muxed\ to\ mkv.ts -vcodec copy -an out.mkv
 ffmpeg version N-47291-g0b14c19 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Nov 29 2012 21:54:38 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52.  9.102 / 52.  9.102
   libavcodec     54. 77.100 / 54. 77.100
   libavformat    54. 40.100 / 54. 40.100
   libavdevice    54.  3.100 / 54.  3.100
   libavfilter     3. 23.104 /  3. 23.104
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.101 /  0. 17.101
   libpostproc    52.  2.100 / 52.  2.100
 [mpegts @ 0x326b240] PES packet size mismatch
 [mpegts @ 0x326b240] Could not find codec parameters for stream 2 (Audio:
 ac3 ([129][0][0][0] / 0x0081), 0 channels, s16): unspecified sample rate
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 [NULL @ 0x3270380] start time is not set in estimate_timings_from_pts
 [mpegts @ 0x326b240] PES packet size mismatch
 Input #0, mpegts, from 'Ts cannot be muxed to mkv.ts':
   Duration: 00:00:01.79, start: 58016.615744, bitrate: 9158 kb/s
   Program 1
     Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
 yuv420p, 1440x1080 [SAR 4:3 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn,
 59.94 tbc
     Stream #0:1[0x34]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
 stereo, s16, 384 kb/s
     Stream #0:2[0x35]: Audio: ac3 ([129][0][0][0] / 0x0081), 0 channels,
 s16
 Output #0, matroska, to 'out.mkv':
   Metadata:
     encoder         : Lavf54.40.100
     Stream #0:0: Video: mpeg2video ([2][0][0][0] / 0x0002), yuv420p,
 1440x1080 [SAR 4:3 DAR 16:9], q=2-31, 29.97 fps, 1k tbn, 90k tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 [matroska @ 0x3272ec0] Can't write packet with unknown timestamp
 av_interleaved_write_frame(): Invalid argument
 }}}
 Adding -fflags +genpts fixes the problem, maybe this should be added
 automatically if necessary:
 {{{
 $ ffmpeg -fflags +genpts -i Ts\ cannot\ be\ muxed\ to\ mkv.ts -vcodec copy
 -an out.mkv
 ffmpeg version N-47291-g0b14c19 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Nov 29 2012 21:54:38 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52.  9.102 / 52.  9.102
   libavcodec     54. 77.100 / 54. 77.100
   libavformat    54. 40.100 / 54. 40.100
   libavdevice    54.  3.100 / 54.  3.100
   libavfilter     3. 23.104 /  3. 23.104
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.101 /  0. 17.101
   libpostproc    52.  2.100 / 52.  2.100
 [mpegts @ 0x195b340] PES packet size mismatch
 [mpegts @ 0x195b340] Could not find codec parameters for stream 2 (Audio:
 ac3 ([129][0][0][0] / 0x0081), 0 channels, s16): unspecified sample rate
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 [NULL @ 0x1960540] start time is not set in estimate_timings_from_pts
 [mpegts @ 0x195b340] PES packet size mismatch
 Input #0, mpegts, from 'Ts cannot be muxed to mkv.ts':
   Duration: 00:00:01.79, start: 58016.615744, bitrate: 9158 kb/s
   Program 1
     Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
 yuv420p, 1440x1080 [SAR 4:3 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn,
 59.94 tbc
     Stream #0:1[0x34]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
 stereo, s16, 384 kb/s
     Stream #0:2[0x35]: Audio: ac3 ([129][0][0][0] / 0x0081), 0 channels,
 s16
 Output #0, matroska, to 'out.mkv':
   Metadata:
     encoder         : Lavf54.40.100
     Stream #0:0: Video: mpeg2video ([2][0][0][0] / 0x0002), yuv420p,
 1440x1080 [SAR 4:3 DAR 16:9], q=2-31, 29.97 fps, 1k tbn, 90k tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 frame=   33 fps=0.0 q=-1.0 Lsize=    1440kB time=00:00:00.96
 bitrate=12189.4kbits/s
 video:1439kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 0.068458%
 }}}
 See also ticket #1415, #1552 and #1553.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1979>
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