Hi Andrea, On Thursday 24 September 2009 23:03:17 Andrea Grandi wrote: > Hi, > > 2009/9/24 Laurent Pinchart <[email protected]>: > > Hi Andrea, > > Your log is truncated. Can you set the trace parameter to 127 and capture > > the kernel log again ? > > sorry, this was the right link: http://pastebin.com/m18f4f623 > > I hope this is ok.
Yes it is, thanks. The log shows the Cheese opens the device four times to stream video data. [ 2222.650758] uvcvideo: Trying format 0x56595559 (YUYV): 1280x800. [ 2222.650761] uvcvideo: Using default frame interval 111111.1 us (9.0 fps). ... [ 2224.759563] uvcvideo: Trying format 0x47504a4d (MJPG): 1280x800. [ 2224.759566] uvcvideo: Using default frame interval 33333.3 us (30.0 fps). ... [ 2230.361550] uvcvideo: Trying format 0x47504a4d (MJPG): 1280x800. [ 2230.361553] uvcvideo: Using default frame interval 33333.3 us (30.0 fps). ... [ 2241.682398] uvcvideo: Trying format 0x47504a4d (MJPG): 1280x800. [ 2241.682401] uvcvideo: Using default frame interval 33333.3 us (30.0 fps). The first time it captures a single YUV 1280x800 frame, the next three times it captures several MJPG 1280x800 frames. The third capture run gets quite slow after some time: [ 2232.317576] uvcvideo: uvc_v4l2_ioctl(VIDIOC_QBUF) [ 2232.317586] uvcvideo: Queuing buffer 1. [ 2232.317835] uvcvideo: uvc_v4l2_ioctl(VIDIOC_DQBUF) [ 2232.317840] uvcvideo: Dequeuing buffer 0 (3, 154384 bytes). [ 2232.382032] uvcvideo: uvc_v4l2_ioctl(VIDIOC_QBUF) [ 2232.382041] uvcvideo: Queuing buffer 0. There's a two seconds delay here between the time when buffer 0 is queued and the time the next buffer is dequeued. If the application waits two seconds before calling VIDIOC_DQBUF the driver can't do much about it. [ 2234.067161] uvcvideo: uvc_v4l2_ioctl(VIDIOC_DQBUF) [ 2234.067170] uvcvideo: Dequeuing buffer 1 (3, 157576 bytes). [ 2234.119014] uvcvideo: uvc_v4l2_ioctl(VIDIOC_QBUF) [ 2234.119024] uvcvideo: Queuing buffer 1. [ 2234.561870] uvcvideo: uvc_v4l2_ioctl(VIDIOC_DQBUF) [ 2234.561879] uvcvideo: Dequeuing buffer 0 (3, 161384 bytes). [ 2234.613641] uvcvideo: uvc_v4l2_ioctl(VIDIOC_QBUF) [ 2234.613650] uvcvideo: Queuing buffer 0. [ 2235.859377] uvcvideo: uvc_v4l2_ioctl(VIDIOC_DQBUF) [ 2235.859385] uvcvideo: Dequeuing buffer 1 (3, 159096 bytes). [ 2235.910547] uvcvideo: uvc_v4l2_ioctl(VIDIOC_QBUF) [ 2235.910555] uvcvideo: Queuing buffer 1. [ 2235.910742] uvcvideo: uvc_v4l2_ioctl(VIDIOC_DQBUF) [ 2235.910747] uvcvideo: Dequeuing buffer 0 (3, 146648 bytes). [ 2236.005059] uvcvideo: uvc_v4l2_ioctl(VIDIOC_QBUF) [ 2236.005068] uvcvideo: Queuing buffer 0. I suspect that you're running into different issues with Cheese and Skype. As Skype is closed source, you should probably try to solve the Cheese problem first. I suspect it comes from userspace so you'll have to look there (either in Cheese itself, in gstreamer or in libv4l). strace might help. -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
