[mythtv] Re:Transcoding pvr-250 files

Russ Southern russ.southern at cox.net
Fri Aug 29 16:41:05 EDT 2003

On Fri, Aug 29, 2003 at 09:10:56AM -0500, Geoffrey Hausheer wrote:
> On Fri, 29 Aug 2003 00:21:23 -0400, "Vinton Coffman
> vintonc-at-redzone.com |mythtv/1.0-Allow|" <661whj4npx0t at sneakemail.com>
> said:
> > I swapped in the new fix.  The total time is still wrong.  I transcoded 
> > another 1 hour show and the total time is 21:32.  I've been timing this 
> > show for a while and 20 minutes of real time translates into ~9 
> > minutes.  Sorry for the lack of precision.  If you need more accuracy I 
> > can retime the whole show tomorrow.
> Hmm.  I really can't explain this without sitting in front of my TV for a
> while.  The patch I sent should have fixed it as far as I can tell.
> Oh well, the patch is right (even if it doesn't fix the problem), and
> it's in CVS now.  I'll take a look at this sometime next week, I guess.

Could this be related to mplayer's seek/time calc issue?  mplayer assumes
CBR when calculating times/offsets (X bytes per frame), but MPEG is VBR. 
My experimentation showed almost exactly the skew Vinton is reporting (just
less than 1/2).  

Does myth now try to calculate show length based on some number of bytes per
frame or keyframe?

Just a thought...

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