Laurent Pinchart wrote: > [...] > I tested various webcams. One of them didn't include the PTS and SCR fields > in > any packet. All others did.
Since we're on the subject of frame clocks, I tested a Quickcam Ultra Vision and used gettimeofday to stamp each frame as it arrived. It seems that the frames are always sent with a 40ms granularity no matter what the frame rate is, except at 30Hz where each frame is 33ms apart. For instance, if I request 10Hz, instead of having each frame 100ms apart, I get 80ms -> 120ms -> 80ms -> 120ms.... So, the only "constant period" modes are 25Hz and 30Hz. I thought this might be related to powerline filtering, but I tested with every setting (starting with no filter at all) and still saw the same behavior. Is this a limitation of the camera? -- Paulo Marques Software Development Department - Grupo PIE, S.A. Phone: +351 252 290600, Fax: +351 252 290601 Web: www.grupopie.com "Very funny Scotty. Now beam up my clothes." _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
