Toby Jaffey writes: > > On Sat, Mar 02, 2002 at 11:01:26AM +0100, Ralph Metzler wrote: > > Toby Jaffey writes: > > > Do the available DVB cards have voltage controlled 27mhz oscillators for > > > this function or is it managed some other way? > > > That's all controlled by the firmware on the card. > > The driver just selects the PID. > > In the cards with a hardware decoder that makes sense. The decoder would > run at the speed dictated by the 27mhz VCXO. But, in the cheaper cards > which only do a demux then rely on software decoding, how does the > software decoder adjust it's speed accordingly? Is PCR recovery done by > the software decoder? > > Is it just forced to repeat/skip frames to make up for the time > difference? > > Or does the provided software decoder take a clock pulse from the DVB > card's VCXO to run by?
What provided software decoder? There are a couple of MPEG2 decoders for Linux, which have different synching schemes. Most don't handle transport streams yet and you have to use some TS to PS/PES converter. And they don't necessarily need an external clock from the DVB card or even an SCR/PCR to get synching right. Even the DVB hardware doesn't need SCR/PCR information for that. Marcus -- Info: To unsubscribe send a mail to [EMAIL PROTECTED] with "unsubscribe linux-dvb" as subject.
