[FFmpeg-user] 'Duration: N/A' for some videos ?

[Shyam Sundar]

Hi All,

I am seeing Duration as N/A for number of videos ...

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$ ./ffprobe.exe C:/Rajiv/pixeltools.atsc.cea608.mpg

ffprobe version 1.2 Copyright (c) 2007-2013 the FFmpeg developers
  built on Mar 28 2013 00:34:08 with gcc 4.8.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-libass --enable-libbluray --enable-libcaca
--enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid
--enable-zlib
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpegvideo @ 000000000226ea00] Estimating duration from bitrate, this may
be inaccurate
Input #0, mpegvideo, from 'C:/Rajiv/pixeltools.atsc.cea608.mpg':
*  Duration: N/A, bitrate: N/A*
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 8:9 DAR
4:3], 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
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It's a valid video of few seconds and plays fine.

Sample - http://files.videohelp.com/u/211860/pixeltools.atsc.cea608.mpg

Any idea ?

Thanks.