[CentOS] Video Recording

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 at 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.


-- 
Bryan J. Smith   mailto:b.j.smith at ieee.org
http://thebs413.blogspot.com
------------------------------------------
Some things (or athletes) money can't buy.
For everything else there's "ManningCard."


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