[MEncoder-users] ERROR: SCR: warning; what does that mean?

[Nico Sabbi]

Brian Keener wrote:

> I'm re-encoding a huffyuv-encoded file to mpeg2, dvd-compatible video 
> stream.
>
> My command line is:
>
> mencoder tv.avi -of mpeg -oac lavc -ovc lavc -lavcopts 
> vcodec=mpeg2video:vbitrate=8000:keyint=25 -vf 
> hqdn3d,pullup,pp=md,scale=720:480 -noskip -o tvout.mpg
>
> I'm pretty happy with the quality, but I'm still getting lots of 
> errors like
>
> ERROR: SCR: 874360377, APTS: 844830475, DELTA=-0.320 secs
>
> ERROR: SCR: 874469454, APTS: 849649125, DELTA=-0.269 secs
>
> ERROR: SCR: 874578531, APTS: 856877100, DELTA=-0.192 secs
>
> ERROR: SCR: 874687608, APTS: 864105075, DELTA=-0.115 secs
>
> ERROR: SCR: 874796685, APTS: 871333050, DELTA=-0.038 secs
>

these messages mean that  the audio pts is ahead of the "system" (e.g. 
file) timer;
it's one of the most negative thing that can happen in mpeg files, 
because on a standalone
reader (such as dvd) those audio packets will likely be skipped (unless 
the reader
has a minimum of intelligence).
Unfortunately it's not easily fixable, but I have in mind a partial 
rewrite of the muxer,
aimed at solving exactly this problem