[linux-dvb] Re: bypassing the decoding-chip?

[Carsten Koch <Carsten.Koch@icem.de>]

Boris Schäfer wrote:
....
> is it possible to bypass the decoding-chip on the Siemens-DVB-Cards?
> 
> This feature would be very nice to watch other video formats (like DivX)
> or pictures on the tv through the tv-out of the DVB-cars.

This has been discussed here a while ago.
As far as I remember, the consensus was that the DMA interface
of the DVB-S card is too slow for the card to display uncompressed
images.

So the only way to display arbitrary images using the DVB-S card
is to re-encode the arbitrary images into I-frames and send that
stream of I-frames to the card.

Somebody had a concern that this may not be fast enough on a slow
machine. I believe he is wrong, though, because I ahve heard of 
I-frame only MPEG encoders that take uncompressed video from your 
analog TV card and convert it into I-frame only MPEG in real time 
(25 FPS) on a 400 MHz machine. 

Carsten.


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