On Thu, Jul 24, 2008 at 05:30:46PM +0400, Goga777 wrote:
may be you know - does Pentium 4 3 GHz will be enough ?
Even 300MHz are enough. The CPU load is not a load that depends on CPU speed. It depends mainly on the current state of the driver which transfers the video data from the CPU over PCI without using bursts. Autonomous DMA should be possible, but is not yet finished.
do you mean the transfer of compressed (h264 or mpeg2) video data from dvb card to eHD ?
Yes, only the TS (or ES) is transfered. Since the Decypher aborts PCI bursts (I'm not sure if it is just a config setting to circumvent some PCI erratas in the first chip version or really a HW block to "fix" them...), you end up with about 12-15MByte/s transfer rate at most. So a typical 20Mbit/s stream produces about 16% "load" almost independent on the CPU speed.
There are DMA blocks in the chip, but the documentation is a bit ...er... weak....