[linux-dvb] Re: full duplex?

[Arpi <arpi@thot.banki.hu>]

Hi,

> some time ago one of the metzlers mentioned something about limitation
> either of the board or the SAA-chip regarding possible bandwidth ...
> which should be too high with sim. record and playback ... just do
> a search on the linux-dvb-archive.
I know, but it should be enough.

> BTW: I read your announcement regard. mplayer with dvb-support ...
> one question: you decode divx, asf, ... and encode this into mpge2?
yes, but to mpeg1.

> Right??? So is it possible to generate mpge2-input for the dvbs from
> any uncompressed-image-source and what processor power is needed???
it works with YV12 input. currently it has high cpu load, because some
part of the mpeg frame encoder is unoptimized. i'm working on it...

btw in the future i'll try to add faster divx/mpeg4/h263->mpeg2
transcoder. it can save many cpu, as doing DCT & MC by hardware, only
decodes, translate and re-encode huffman stuff.
But it has a big problem: unrestricetd MV, which is used in mpeg4 variants.
I think the DVB card's decoder doesn't support it, but it can be emulated:
allocate 64 pixel wider/higher buffer, and encode (it can be optimized a
lot) the borders by software. The only problem is display: you'll see the
borders which is ugly and flickering... maybe we can restrict displayable
area by driver modification. I don't know is it possible or not.
Oh, and yet another prob: we must know the border pixels, ie. grab the
decoded image from the card... it is a big problem because of the buffering!


A'rpi / Astral & ESP-team

--
mailto:arpi@thot.banki.hu
http://esp-team.scene.hu


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