Thanks for the couple of suggestions.
I briefly drifted into Ubuntu land and came across a couple of tools that use OGG natively.
It is not a perfect solution but I can use Istanbul (a GNOME screen full screen recorder) to record the visual element as a theora file. Then use any OGG capable program to record the audio. Finally using oggzmerge to merge the two OGG files into another OGG file that combines the audio & video.
If anyone else is interested the two tools can be found at the links below:-
http://live.gnome.org/Istanbul
http://annodex.net/software/liboggz/
Thanks again
Lee
-----Original Message----- From: Bryan J. Smith [mailto:thebs413@earthlink.net] Sent: 27 November 2005 16:01 To: CentOS mailing list Subject: Re: [CentOS] Video Recording
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.