Em Tuesday 15 January 2008 18:56:35 Laurent Pinchart escreveu: > Hi Herton, > > On Tuesday 15 January 2008, Herton Ronaldo Krzesinski wrote: > > Hi Laurent, thanks for the commit and advice. We played with the webcam > > again (sorry for delay) and we found out that it isn't really reporting the > > FID bit, but only end of frame marker (EOF). This is strange indeed, as > > from what I understand from UVC spec FID is required while EOF is optional. > > The bmFramingInfo field in the probe&commit control can be used by the device > to report if it supports FID and/or EOF. However, for known frame-based > formats, the field must be ignored. Just out of curiosity, could you print > the field's value when reading the probe and commit controls ?
It's always 0x00, falls at else in size check inside uvc_get_video_ctrl: uvc_get_video_ctrl: size != 34, bmFramingInfo = 0x00 > > > I reworked the quirk that Claudio made against revision 166 from svn, but > > now using the EOF to sync the stream (the previous quirk was ok, but on > > laggy communication, like using to transmit a video stream over internet > > etc., the frames would overlap etc. resulting in many display issues): > > Your patch could drop the last payload of each frame. Could you please try > the > attached patch ? It works, but gives a different behaviour: for example, I simulate lag in luvcview placing a sleep(1) at the start of uvcGrab function, with this patch it captures only some frames at start and stops, with the patch I posted I receive continous snapshots. > > Best regards, > > Laurent Pinchart > -- []'s Herton _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
