Thansk a lot now I can grab up to 25 ~30 fps ...
Do you have a method to display the grabbed frame on screen with 25 fps ??
Thanks Again
At 10:46 09/07/2003 +0200, vous avez écrit:
James REGIS wrote:
hi,I am make program to capture from v4l device, when I use 640x480, it
can't do 12.5 frame per second,this speed is common, with 320x240, it
also do 12.5 fps,it's too slow, why? I compare with the fbtv in console
mode, 640x480 it can do 12.5 fps, the same as mine, but with resolution
320x240,it can do 24~25 fps, the source code of fbtv is fairly complex
and now I have no much time to read it. can anyone give me a sugguest to
improve the capture speed! I attache my code for ref .thanks!
Many cards are slower as soon as you dont use the standard size 704x576
and/or the preferred pixel format (usually YUV420P) I have no problems
grabbing 25fps at this size and format *provided* the code uses the
multi-buffer, interleaved capture as described in the "Programming-FAQ"
that comes with the xawtv distro. *Then* I do the scaling, cropping, etc
by software.
HaND,
--
Michel Bardiaux
Peaktime Belgium S.A. Bd. du Souverain, 191 B-1160 Bruxelles
Tel : +32 2 790.29.41
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