m2v: wrong duration

[cbsrobot]

When converting any file to a m2v and checking the resulting file, the duration is not correctly calculated. mplayer shows also wrong duration. Quicktime and Mediainfo show the correct duration.

example:
ffmpeg -i fate/aletrek-rle.mov -target pal-dvd -f mpeg2video -an aletrek-rle.m2v
[...]
Duration: 00:00:03.33

ffprobe aletrek-rle.m2v
[...]
Duration: 00:00:00.76

mediainfo aletrek-rle.m2v
[...]
Duration : 3s 400ms

mplayer -vo null -ao null -frames 0 -identify aletrek-rle.m2v
[...]
ID_LENGTH=0.77

[cehoyos]

Please post your ffmpeg command line and complete, uncut console output.

[cbsrobot]

$ ffmpeg -i aletrek-rle.mov -target pal-dvd -f mpeg2video -an aletrek-rle.m2v
ffmpeg version N-35336-g18abf46, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec  1 2011 22:40:41 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libvpx --enable-libmp3lame --enable-libfreetype --enable-libopenjpeg --prefix=/usr/local
  libavutil    51. 29. 1 / 51. 29. 1
  libavcodec   53. 39. 1 / 53. 39. 1
  libavformat  53. 24. 0 / 53. 24. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 50. 0 /  2. 50. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0

Seems stream 0 codec frame rate differs from container frame rate: 600.00 (600/1) -> 10.00 (10/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'aletrek-rle.mov':
  Metadata:
    creation_time   : 2002-10-18 17:15:11
  Duration: 00:00:03.33, start: 0.000000, bitrate: 567 kb/s
    Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 160x120, 564 kb/s, 10.20 fps, 10 tbr, 600 tbn, 600 tbc
    Metadata:
      creation_time   : 2002-10-18 17:15:11
      handler_name    : ?Apple Alias Data Handler
File 'aletrek-rle.m2v' already exists. Overwrite ? [y/N] y
w:160 h:120 pixfmt:rgb24 tb:1/1000000 sar:0/1 sws_param:
[scale @ 0x101813fa0] w:160 h:120 fmt:rgb24 -> w:720 h:576 fmt:yuv420p flags:0x4
Output #0, mpeg2video, to 'aletrek-rle.m2v':
  Metadata:
    creation_time   : 2002-10-18 17:15:11
    encoder         : Lavf53.24.0
    Stream #0:0(eng): Video: mpeg2video, yuv420p, 720x576, q=2-31, 6000 kb/s, 90k tbn, 25 tbc
    Metadata:
      creation_time   : 2002-10-18 17:15:11
      handler_name    : ?Apple Alias Data Handler
Stream mapping:
  Stream #0:0 -> #0:0 (qtrle -> mpeg2video)
Press [q] to stop, [?] for help
[mpeg2video @ 0x10204ce00] rc buffer underflow
frame=   85 fps=  0 q=2.0 Lsize=     841kB time=00:00:03.36 bitrate=2051.1kbits/s dup=51 drop=0    
video:841kB audio:0kB global headers:0kB muxing overhead 0.000000%

ffprobe aletrek-rle.m2v 
ffprobe version N-35336-g18abf46, Copyright (c) 2007-2011 the FFmpeg developers
  built on Dec  1 2011 22:40:41 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libvpx --enable-libmp3lame --enable-libfreetype --enable-libopenjpeg --prefix=/usr/local
  libavutil    51. 29. 1 / 51. 29. 1
  libavcodec   53. 39. 1 / 53. 39. 1
  libavformat  53. 24. 0 / 53. 24. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 50. 0 /  2. 50. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
[mpegvideo @ 0x10200f200] Estimating duration from bitrate, this may be inaccurate
Input #0, mpegvideo, from 'aletrek-rle.m2v':
  Duration: 00:00:00.76, bitrate: 8999 kb/s
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 1:1 DAR 5:4], 9000 kb/s, 25 fps, 25 tbr, 1200k tbn, 50 tbc

$ ffprobe aletrek-rle.mov 
ffprobe version N-35336-g18abf46, Copyright (c) 2007-2011 the FFmpeg developers
  built on Dec  1 2011 22:40:41 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libvpx --enable-libmp3lame --enable-libfreetype --enable-libopenjpeg --prefix=/usr/local
  libavutil    51. 29. 1 / 51. 29. 1
  libavcodec   53. 39. 1 / 53. 39. 1
  libavformat  53. 24. 0 / 53. 24. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 50. 0 /  2. 50. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'aletrek-rle.mov':
  Metadata:
    creation_time   : 2002-10-18 17:15:11
  Duration: 00:00:03.33, start: 0.000000, bitrate: 567 kb/s
    Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 160x120, 564 kb/s, 10.20 fps, 10 tbr, 600 tbn, 600 tbc
    Metadata:
      creation_time   : 2002-10-18 17:15:11
      handler_name    : ?Apple Alias Data Handler

[cehoyos]

The output shows "Duration: N/A" now.

$ ffmpeg -i aletrek-rle.m2v
ffmpeg version N-46390-g94f2245 Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov  3 2012 16:53:18 with gcc 4.7 (SUSE Linux)
  configuration: --cc='cc -m32'
  libavutil      52.  3.100 / 52.  3.100
  libavcodec     54. 71.100 / 54. 71.100
  libavformat    54. 35.100 / 54. 35.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 21.106 /  3. 21.106
  libswscale      2.  1.102 /  2.  1.102
  libswresample   0. 16.100 /  0. 16.100
[mpegvideo @ 0x9177500] Estimating duration from bitrate, this may be inaccurate
Input #0, mpegvideo, from 'aletrek-rle.m2v':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 1:1 DAR 5:4], 25 fps, 25 tbr, 1200k tbn, 50 tbc
At least one output file must be specified