[MPlayer-users] accurate VBR info, and more ... with midentify ?

[Nico Sabbi]

Il Thursday 03 April 2008 22:50:44 Juri Mianovich ha scritto:
> 
> Hello,
> 
> When I run 'midentify' against a VBR clip (mpeg, or
> h.264) I often see either an incorrect number, or a
> "0" in the video bitrate.
> 
> Why is this ?
> 
> I would like to know three things about a particular
> VBR video file:
> 
> - average bitrate
> - peak bitrate
> - low/minimum bitrate
> 
> I realize that midentify does not show me the average
> (not sure what it is showing me, when it shows
> something >0) and I know that I will need to,
> essentially, play the entire clip through in order to
> get the peak/minimum bitrates (and probably to get the
> average as well).
> 
> Is there a command line that will tell my system to
> play the clip as fast as the CPU will allow it,
> without any actual video playback (like midentify) so
> that I can get those three numbers as fast as possible
> ?
> 
> Also, out of curiousity, when midentify shows me a VBR
> birate of >0, what is it showing me, exactly ?
> 
> Finally, a lot of clips are giving me either
> drastically wrong, or "0.00" for the:
> 
> ID_LENGTH
> 
> field in midentify ... is there any mplayer command
> line that will show me an accurate length reading for
> _all_ video clips?
> 
> thanks.
> 

mencoder -ovc copy -oac copy -o /dev/null file.mpg