[MPlayer-dev-eng] Re: Forgotten patches/bugreports/etc

Arpi arpi at thot.banki.hu
Tue Aug 19 15:37:49 CEST 2003


> On Sun, Aug 17, 2003 at 11:15:34PM +0200, Alex Beregszaszi wrote:
> > The demuxer length/position reporting is kinda broken for MPEG and MOV.
> > It's only working for AVI.
> It seems to work for mpeg2 though? At least it seems correct for the
> few svcd format clips I had around. 

argh, this must be in the FAQ already

the mpeg demuxer use sthe nominal bitrate from the file header.
if the nominal bitrate in header is valid, ie. it's the real average
bitrate of teh file, then it will report the right length, and -ss will
work ok. but i have several samples where the value in header is false,
for example the hauppauge mpeg 1/2 capture card puts the peak (max)
rate there, instead of the average rate. also there are real vbr streams
where no average bitrate at all.

as svcd is very constrained cbr stream, i guess this value is correct then.
for random vbr encodes it may be totally false.

A'rpi / Astral & ESP-team

Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu
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