Ok, so I've set a workaround in guvcview, it now uses the length filed if bytesused is set to zero. Anyway I think this violates the v4l2 api: http://linuxtv.org/downloads/v4l-dvb-apis/buffer.html bytesused - ..., Drivers must set this field when type refers to an input stream, ... without this value we have no way of knowing the exact frame size for compressed formats. And this was working in uvcvideo up until 3.16, I don't know how many userspace apps rely on this value, but at least guvcview does, and it's currently broken for uvcvideo devices in the latest kernels. Regards, Paulo 2014-09-30 9:50 GMT+01:00 Paulo Assis <pj.assis@xxxxxxxxx>: > I referring to the following bug: > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1362358 > > I've run some tests and after increasing verbosity for uvcvideo, I get: > EOF on empty payload > > this seems consistent with the zero size frames returned by the driver. > After VIDIOC_DQBUF | VIDIOC_QBUF, I get buf.bytesused=0 > > Testing with an eye toy 2 (gspca), everything works fine, so this is > definitly related to uvcvideo. > This happens on all available formats (YUYV and MJPEG) > > Regards, > Paulo -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
