> > I'm trying to get video capture from all 4 inputs of a bttv > > card simultanously ( multiplexed). I've been doing this under > > FreeBSD/OpenBSD following way: > > > > switch_input(0) > > capture_frame(0) > > ... > > ... > > ... > > switch_input(3) > > capture_frame(3) > > > > This works ok, although the 25fps dives to 2-3fps with all 4 inputs > > capturing. I've got pthreaded mmaped capture going under Linux and I'm > > wondering how I should go about this input switching problem? > > Is there a better way to archive this under Linux? I'm gonna test this > > method tonight: > > > > This is a hardware problem. not a software one the bttv chip have one reader > for pictures and thats it. The bttv does have 4 inputs for reading but these > input are multiplexed in front of the reader. Sory, but if you wont to > capture all 4 chanels you need 4 cards. > > Anders Gnistrup I'm already demultiplexing the 4 channels to achive 4 video streams per single bttv device. The problems is archieving higher framerates than 2-3fps per stream by improving the sync speed when switching between inputs. I'm not asking for 4 channel 25fps capture.
