[linux-dvb] Re: VDR 0.80pre8

[Ralph Metzler <rjkm@convergence.de>]

Jan Panteltje writes:
 > >  > 3. Audio "chopped" during replay
 > > 
 > > These will be fixed in the next version.
 > > Some channels really seem to have a big offset between audio and
 > > video and if the video buffer is too small, the audio for the video
 > > data at the buffer exit sometimes has not arrived yet -> audio underflow.
 > > This works fine during normal TV watching since the
 > > hardware/firmware ROM can use the overflow buffer in DRAM.
 > > During playback I cannot (don't know how to) do this and thus need 
 > > more of the original video buffer space.
 > But is it not possible to do some re-arranging of the audio / video,
 > by using a linked list (odf sorts) and then sending back from a different
 > place in the list, so the audio / video is shifted relative to each other?
 > My first test show this is possible, but i have not tested any further,
 > as everything work so perfectly recording av_pes with driver 0.7.1 and
 > plaing back with 0.0.4 .

Just for the audio underflow problem such re-arranging could be
enough. It is probably a lot less overhead than a complete re-muxing.

 
 > It is professional quality really, after more the 15 tapes produced that
 > way I have not had ONE complaint about audio / video sync.
 > And there are NO picture jitters either.
 > Maybe you need to step back and ask: What was so good about 0.0.4?

It had less strict syncing which I am using now too. There should be
no jitters in the current driver's playback. 
Also, 0.4.0 did not always start in sync. This is actually better in
the newer drivers, because I do the stricter kind of syncing (the one
with the jitters, but they normally take a while to show up) during
the first few seconds of playback and then switch to the other mode.


Ralph



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