Re: [PD] lowering gem camera capture CPU overhead

2007-03-18 Thread Anders Friberg
Hi Ico, I've run into exactly the same problem. Most probably it is the decoding of the firewire signal that eats the cpu cycles. The dv format (same as firewire) is compressed into a 29 Mbits/sec stream (see e.g. http://www.adamwilt.com/DV-FAQ-tech.html#DVformats) that needs to be unpacked

[PD] lowering gem camera capture CPU overhead

2007-03-17 Thread Ivica Ico Bukvic
Hi all, I've been trying to shave off precious cycles off the FW camera input capture. The problem is that vanilla capture of a FW camera feed (NTSC) already introduces 50+% of CPU overhead on an AMD64 3000+. I have experimented with lowered gem frame value, but anything below 20 seems to