Hi, I am no using double buffering. I have used a sample code from videodog I believe that to use double buffering I should set the modules.conf parameter add options bttv gbuffers=2 fieldnr=2. Am I wrong ? Please, do you have any sample code showing how I can use double buffer properly ? You said I should get at least 27,28 fps. What computer configuration did you get this ? Thanks a lot, Best regards, André Luiz R. Moutinho Computer Engineer, COMPSIS - Computadores e Sistemas Ind. e Com. Ltda moutinho@xxxxxxxxxxxxxxxxx, moutinho@xxxxxxxxxx Voice: +55 12 394-13966 Fax: +55 12 322-0888 > ----- Mensagem original ----- > De: Gleicon S. Moraes [SMTP:gleicon@xxxxxxxxxx] > Enviada em: terça-feira, 29 de janeiro de 2002 16:25 > Para: video4linux-list@xxxxxxxxxx > Assunto: Re: capture speed improvement > > 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 > gleicon@xxxxxxxxxxxx > gleicon@xxxxxxxxxx > http://planeta.terra.com.br/informatica/gleicon > > ----- Original Message ----- > From: "André Luiz Ribeiro Moutinho" <andre.moutinho@xxxxxxxxxxxxxxxxx> > To: <video4linux-list@xxxxxxxxxx> > Cc: "Mauricio Micoski" <mauricio.micoski@xxxxxxxxxxxxxxxxx>; "Marcelo > Ferreira Vinhas" <marcelo.vinhas@xxxxxxxxxxxxxxxxx> > Sent: Tuesday, January 29, 2002 6:17 PM > Subject: 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, > > > > André Luiz R. Moutinho > > Computer Engineer, COMPSIS - Computadores e Sistemas Ind. e Com. Ltda > > moutinho@xxxxxxxxxxxxxxxxx, moutinho@xxxxxxxxxx > > Voice: +55 12 394-13966 Fax: +55 12 322-0888 > > > > > > > > > > > > > > > > _______________________________________________ > > Video4linux-list mailing list > > Video4linux-list@xxxxxxxxxx > > https://listman.redhat.com/mailman/listinfo/video4linux-list > > > > > > _______________________________________________ > Video4linux-list mailing list > Video4linux-list@xxxxxxxxxx > https://listman.redhat.com/mailman/listinfo/video4linux-list
