on Wed Feb 16 15:09:59 PST 2005(Just imagine 16 video streams in a DVR system. 480 frames/sec <== such a high frame rate, gpu's color space conversion enough??)
Plenty. Especialy as this can be easily pipelined.
Thanks for this valuable info. That clears much of my question.
Ie the graphics card can only help with saving bandwith when supporting some short paths to the video memory when doing decompression. It's not possible to help with compression.
yes.
Note that as long as you have a driver, you don't need X to run to access the card.
agree.
No, not needed to. Just get the scheduler to do it's job right. But you'd be i/o limited anyways. Getting out two video uncompressed video streams over PCI is .. well.. quite at the limit.
In one hand one process must do video compression as high frame rate as it can. And that causes lots of disk io. On the other hand, another
process must show original uncompressed video streams in real time.
Take 16 BT878 chips as an example, writing 480 frames(cif size) through
PCI bus is not a problem if you ignore serious FIFO overrun. But coming to flawless real time, the user space process can show each video stream
30 frames/sec in average. flawless?? No. There are other busy processes
and this ocasionally causes some delay. Some time intervals between
some of the two continuous frames would be longer than 1/30 second
or even longer than 1/15 second, but still each video stream 30 frames/sec
in average.
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