If should get at least 27, 28 fps with this card. The read syscall can be slower than a memcpy from a mmap'ed device. Something must be wrong with your code, check out if you are using double buffering properly. Best regards
-- Gleicon S. Moraes [EMAIL PROTECTED] [EMAIL PROTECTED] http://planeta.terra.com.br/informatica/gleicon ----- Original Message ----- From: "Andr� Luiz Ribeiro Moutinho" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: "Mauricio Micoski" <[EMAIL PROTECTED]>; "Marcelo Ferreira Vinhas" <[EMAIL PROTECTED]> Sent: Tuesday, January 29, 2002 6:17 PM Subject: [V4L] capture speed improvement > Hi > > I am developing a capture and video multicast. I have > used the VIDIOCMCAPTURE and VIDIOCSYNC ioctls to read > 1 frame from the grabber (struct video_mmap.frame = 0) > > I could accomplish this but the maximum frame rate is 15. > I would like to know how I can improve the video frame rate. > I need a higher frame rate and the CPU usage is very low. > > What about using the read syscall ? Is it faster than mmap > method ? Is threre a faster method ? Do I have a DMA access > time limit ? > > I am using the PixelView Play TV Pro and running under > a Pentium 300Mhz equivalent machine and linux RH7.1 > kernel 2.4.7. > > Thanks a lot, > > Andr� Luiz R. Moutinho > Computer Engineer, COMPSIS - Computadores e Sistemas Ind. e Com. Ltda > [EMAIL PROTECTED], [EMAIL PROTECTED] > Voice: +55 12 394-13966 Fax: +55 12 322-0888 > > > > > > > > _______________________________________________ > Video4linux-list mailing list > [EMAIL PROTECTED] > https://listman.redhat.com/mailman/listinfo/video4linux-list > _______________________________________________ Video4linux-list mailing list [EMAIL PROTECTED] https://listman.redhat.com/mailman/listinfo/video4linux-list
