--- Michel Bardiaux <mbardiaux@xxxxxxxxxxx> wrote: > 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. Im interested to know what tools you use for capture, and what format you capture in. I'm after a good way to capture useing a lossless codec for later processing. Steve ===== -- If you listen very carefully you can sometimes hear the dolphins sing pinguellis@xxxxxxxxxxx __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com
