[linux-dvb] Re: PCM syncing

[Andreas Schultz <aschultz@warp10.net>]

Hi,

Ralph Metzler wrote:

> Hi,
> 
> I added a crude syncing mechanism for PCM playback to the firmware.
> First tests playing back a DVD with PCM sound are promising.
> Previously sync was often lost when freezing and continuing 
> the playback. Now it always stays in sync.
> 
> To take advantage of this in DVD playback you will have to insert
> the PTS of the initial AC3 PES into the PCM PES. 
> The total PES length still must not exceed 2048 bytes and it seems
> that the actual PCM payload (after PES header and PCM header)
> has to be word aligned to the PES start for the AV7110 to correctly
> swallow it. So, add padding to the PES header if necessary.


Ahhhrrrrggggghhhh, now i have to dig through tons of vdr-devel-xxxxx 
directories to find the PTS insert stuff again :-))).
I played with it and throwed it away because it messed up the output.

Anyway, many thanks for this.

One more question, either i got the wrong PTS or video packet PTS are 
not same as audio packet PTS for AC3. Is that OK, or do they have to be 
syncron?

Andreas

> 
> Ralph
> 
> 
> 





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