[MPlayer-users] Re: help wanted: using mencoder to make NTSC DVD from transport stream

D Richard Felker III dalias at aerifal.cx
Mon Mar 7 07:09:20 CET 2005

On Sun, Mar 06, 2005 at 07:16:22PM +0100, Nico Sabbi wrote:
> Nico Sabbi wrote:
> >Aaron Peterson wrote:
> >
> >>I was using -oac mp3lame -lameopts br=96 before, and the original
> >>audio was reported by mplayer as divx2 audio if I remember
> >>correctly...
> >>
> >> 
> >>
> >
> >aaaargh, this means VBR mp3, that can't work in mpegs generated by 
> >mencoder (yet).
> >you needed :cbr  in -lameopts
> btw this lead me to investigate more deeply:
> in case of -oac toolame mencoder.c always AvgBytesPerSecond to 192 kb/s,
> that is obviously plain wrong; this leads the muxer to calculate the 
> wrong pts
> for the reason above and also because the number of samples_per_frame
> for sample_rates < 32000 is 576 instead of 1152.

This should be fixed..

> Rich, is there any reason why that 192 shouldn't be corrected?

It should be corrected. However your muxer shouldn't use
AvgBytesPerSecond. Instead it should parse individual frames to know
exact durations/pts.


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