Re: Cheese Webcam Booth Frame Rates

[Alexey Fisher <bug-track fisher-privat net>]

On Do, 2011-04-28 at 13:15 -0400, Scott O'Nanski wrote:
> I noticed Cheese frames rates drop to 10 frames per second in high
> resolution mode 1280x800 with my Microsoft Live Cam Cinema.
> 
> Is this a bug? Is there some way to work around it?

Assume you use usb 2.0, it mean maximal possible speed is 480 Mbit/s. If
you take in count usb and uvcvideo overhead, and may be the quality of
the cable you may get about 200-300 Mbit/s.
Now calculate what bandwidth you need to capture 1280x800 30fps:
1280 * 800 * 16(for row stream) * 30(fps) = 491 Mbit/s
Even with theoretical bandwidth, it is impossible to capture this
stream.

IMHO it is cheese Bug to suggest this kind resolution for video capture.
It should have two different settings for video and photo. Photo should
use max resolution, video should use best frame rate.
-- 
Regards,
        Alexey