Hi, I have a Logitech QuickCam 4000 Pro USB and I am trying to use mplayer to play the video. This is the command I use
mplayer -tv width=640:height=480:driver=v4l2 -fps 15 tv:// But when I quit mplayer hangs in the following line, while shutting down the video /* unqueue all remaining buffers */ memset(&buf,0,sizeof(buf)); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; while (!ioctl(priv->video_fd, VIDIOC_DQBUF, &buf)); Which is more or less at line 1111 of stream/tvi_v4l2.c. The problem is that the ioctl call VIDIOC_DQBUF never returns. Reading the doc for VIDIOC_DQBUF http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec/r8849.htm The function should stop if there is no block to unqueue, unless it has been opened with O_NONBLOCK. mplayer DOES NOT use O_NONBLOCK, so the call is allowed to block. The problems are 2 1) I've tried to open with O_NONBLOCK and the ioctl blocks anyway. pwc-v4l.c at line 1120 does not check for O_NONBLOCK. Is this a bug? 2) should mplayer handle the situation in a different way? is there a way to check if there are queued blocks? Andrea _______________________________________________ pwc mailing list pwc@lists.saillard.org http://lists.saillard.org/mailman/listinfo/pwc