[MPlayer-users] Get dimensions and duration of raw h.264 video

[Marlon Smith]

On Tue, 2012-02-07 at 23:07 +0100, Reimar Döffinger wrote:

> On Tue, Feb 07, 2012 at 01:43:25PM -0800, Marlon Smith wrote:
> > Thanks for the help.  ffmpeg does determine the correct dimensions, and
> > gives me this:
> > 
> > Seems stream 0 codec frame rate differs from container frame rate: 60.00
> > (60/1) -> 30.00 (60/2)
> > Input #0, h264, from './input.264':
> >   Duration: N/A, bitrate: N/A
> >     Stream #0.0: Video: h264, yuv420p, 800x480 [PAR 533:400 DAR
> > 533:240], 30 fps, 30 tbr, 1200k tbn, 60 tbc
> > 
> > I created this video with mencoder, and it looks like mencoder didn't
> > write the container info properly?  Ideally, I'd like to use mplayer to
> > parse the information, since I want to include it with an application
> > I'm writing.  Is there a way I can get mencoder to properly write this
> > data with the video so that mplayer can read it back?  The video is
> > 800x480, but mplayer shows it as 533x400.  I see those numbers in the
> > output, but I don't understand what PAR and DAR are.
> 
> They are the aspect values, i.e. when a video should be displayed
> in a different format than it was decoded.
> There seems to be a bug (for which I just sent a patch to the
> -dev-eng list) that MPlayer would overwrite and print the
> aspect values instead of the actual video dimension when using
> unusual aspect values.
> One option to avoid it is to make mencoder use one of the
> standard aspect values like 4:3 or 16:9...
> (or compile a MPlayer with the patch I sent applied).
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Thanks Reimar!  I compiled MPlayer with your patch applied and now it
works great!  Now I just need to figure out how to compile MPlayer in
Windows..

Much appreciated.

Marlon