[vdr] Re: DolbyDigital (bitstreamout): Sound later than Pic...

[Mario Schellenberger <schelli@gmx.net>]

Hello Dr. Werner Fink, hello list,

DWF> In other words this delay is _always_ given on the very beginning?

Yes it is. As soon as i switch to Pro 7 the sound hangs behind. I
played with the various options of the plugin but did not manage to
eliminate the audio-gap totally. A pair of pc-speakers connected to
the line out of the soundcards still plays the (non Dolby Digital)
sound in sync with the video, so i could compare the result of the
different options. i think (not sure, maybe is just imagination) the
best option is "delay" set to 6, but its still not totally sync.

DWF> Or does it happen after a few minutes or hours?  In the later case
DWF> the quart on the soundblaster is faster then the normal time used
DWF> by Pro7 (48kHz of the soundblaster != 48kHz of DD from Pro7).
DWF> This cause underruns of the sound buffer and the plugin will compensate
DWF> that (if VariableIO id set to yes) by doubling DD frames (one with
DWF> error bit set).  This works with my A/V receiver.

No, the delay is there from the beginning. Did not yet have the time
to watch Pro7 for longer than 1/2 hour and as far as that i didn't notice a growing
in the delay.

>> is my pc too slow? it is a celeron running at 533 mhz with 256 mb ram.
>> i don't think the speed of the pc is the cause, because if i stop the
>> live-signal and watch the time-shifted signal (pause of 1-5 sec)
>> everything seems to be sync. recordings too seem to be ok, but i
>> didn't yet test a longer recording to check if A/V stays in sync!

DWF> Your pc isn't to slow ;^)

fine :-)


DWF> Try to play with the setup of the plugin. E.g. decrease the Delay
DWF> ... if this doesn't help, set it to max (maybe we see an overrun
DWF> due slow initialization of the soundblaster).

tried every option except for the "memory map" option which caused my
old configuration to hang, everytime i switched it on!

DWF> If your soundblaster supports slave mode (this is the mode where
DWF> the reference clock is taken from the S/P-DIF in) then try to
DWF> enable this with S/P-DIF out from the DVB card connected to the
DWF> S/P-DIF in of the soundblaster.  Then all synch problems are gone.

I don't know about that. i have no idea how to check if the sblive
supports slave mode and how to activate it. if it would be possible i
should try to build a DVB to SBlive connector to check if that would
be the solution for my problem.

Thanks for your reply!
mario

Mario Schellenberger
mailto:schelli@gmx.net



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