On Sat, 2005-11-26 at 23:14 -0800, Ajay Sharma wrote:
> Oh, and the CPU usage is tiny so you can capture several streams with
> multiple PVR-150 cards in a decent desktop box.
Just FYI, it's more than just CPU usage. A "raw" analog NTSC video
stream (I'm assuming NTSC) is over 30MBps. Considering it goes from
card to memory to disk -- possibly all over the same, shared 32-bit @
33MHz PCI bus (133MBps), it saturates much of the PCI bus, so frame loss
is probable.
So having at least an MJPEG compressed stream reduces that far more to a
measly 1-6MBps (depending on compression ratio), and MPEG-2 typically to
under 1MBps. You usually want to capture MJPEG if you are going to edit
the video (especially if you need high quality, individual frames), or
MPEG-2 when you only might recorder/cut it or possibly convert it to a
lower-quality anyway.
--
Bryan J. Smith mailto:b.j.smith@xxxxxxxx
http://thebs413.blogspot.com
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