[vdr] [ANNOUNCE] bitstreamout plugin 0.70 (sound loop through sound card)

Dr. Werner Fink werner at suse.de
Mon Feb 21 14:54:08 CET 2005

On Mon, Feb 21, 2005 at 03:41:40PM +0200, Esa Viitala wrote:
> Dr. Werner Fink wrote:
> >Hi,
> >
> >   just uploaded bitstreamout-0.70 which should works with
> >VDR 1.3.21+.  The URL for download is given in my signature.
> >
> >           Werner
> >
> Thanks! Compiled and installed without problems there, but I'm 
> experiencing a bit of problems with this plugin, the synchronization 
> seems to be off by around 1 second (audio comes too late, so adding 
> delay doesn't help). Also, should this work with mp3 plugin (0.9.11)? 
> When bitstreamout is in use and mp3 playback is started the log gets 
> thousands of bounce buffer overflow messages and no sound.

This sounds like the bitstreamout plugin receives a lot of data.
Maybe the audio data from current use _and_ the pcm data from
the mp3 playback.

> --clip--
> Feb 21 10:24:41 [vdr] BOUNCE BUFFER: Bufferoverlow_
>                 - Last output repeated 4216 times -
> --clip--
> The system where I tried this has Hauppauge DVB-C 2.1 FF and TT budget 
> C, running vdr 1.3.21, old dvb drivers (linux-dvb.2003-11-08) and 
> 2.4.26-gentoo-r9 kernel. Perhaps I should try latest dvb drivers next.

This has nothing todo with the dvb driver. The problem is, that
decoding Mpeg Audio takes a while and this time is lost for
synchronization.  And the HW buffer of the soundcard should
be filled a bit to be able to play soound upto the next data
is received and decoded.  This is the reason why I use for
Mpeg Audio the J2 Jumper of the DVB card to redirect the output
to the internal S/P-DIF input of the sound card to be able to
loop the data through the sound card.


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