On Fri, 2010-01-08 at 14:07 -0500, TJ wrote: > Pete and anybody else out there with go7007 devices, what do you use for > capture?
I used a modified capture.c, based on http://v4l2spec.bytesex.org/v4l2spec/capture.c In the init_device(void) function, use: fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; switch (G_size) { case 0: fmt.fmt.pix.height = 640; fmt.fmt.pix.width = 480; break; case 1: fmt.fmt.pix.height = 320; fmt.fmt.pix.width = 240; break; } switch (type) { case TYPE_MJPEG: printf("MJPEG\n"); fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG; break; case TYPE_MPEG1: case TYPE_MPEG2: case TYPE_MPEG4: fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG; break; } fmt.fmt.pix.field = V4L2_FIELD_ANY; if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) errno_exit ("VIDIOC_S_FMT"); /* Note VIDIOC_S_FMT may change width and height. */ /* Buggy driver paranoia. */ min = fmt.fmt.pix.width * 2; if (fmt.fmt.pix.bytesperline < min) fmt.fmt.pix.bytesperline = min; min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height; if (fmt.fmt.pix.sizeimage < min) fmt.fmt.pix.sizeimage = min; /* optional MPEG parameters */ if( type != TYPE_MJPEG) { struct v4l2_control ctrl; ctrl.id = V4L2_CID_MPEG_VIDEO_ENCODING; switch (type) { case TYPE_MPEG1: ctrl.value = V4L2_MPEG_VIDEO_ENCODING_MPEG_1; break; case TYPE_MPEG2: ctrl.value = V4L2_MPEG_VIDEO_ENCODING_MPEG_2; break; case TYPE_MPEG4: ctrl.value = V4L2_MPEG_VIDEO_ENCODING_MPEG_4_SP; break; } if (0 != xioctl (fd, VIDIOC_S_CTRL, &ctrl)) { printf("could not set video encoding\n"); } ctrl.id = V4L2_CID_MPEG_VIDEO_BITRATE; ctrl.value = G_br; if (0 != xioctl (fd, VIDIOC_S_CTRL, &ctrl)) { printf("could not change bitrate\n"); } } > Without GO7007 ioctls, I was only able to get vlc to capture in MJPEG format. Does VLC try to change video parameters after starting the stream? The driver currently doesn't allow that. I think I've seen xawtv try to do that too. Pete -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
