Hi Pawel, On 12/11/14 15:42, Nicolas Dufresne wrote: > Le jeudi 11 décembre 2014 à 11:00 -0200, Fabio Estevam a écrit : >> Hi, >> >> I am running Gstreamer 1.4.4 with on a imx6q-sabresd board and I am >> able to decode a video through the coda driver. >> >> The pipeline I use is: >> gst-launch-1.0 filesrc >> location=/home/H264_test1_Talkinghead_mp4_480x360.mp4 ! qtdemux ! >> h264parse ! v4l2video1dec ! videoconvert ! fbdevsink > > This is a known issue. The handling of EOS and draining is ill defined > in V4L2 specification. We should be clarifying this soon. Currently > GStreamer implements what was originally done in Exynos MFC driver. This > consist of sending empty buffer to the V4L2 Output (the input), until we > get an empty buffer (bytesused = 0) on the V4L2 Capture (output). > > The CODA driver uses the new method to initiate the drain, which is to > send V4L2_DEC_CMD_STOP, this was not implemented by any driver when GST > v4l2 support was added. This is the right thing to do. This is tracked > at (contribution welcome of course): > > https://bugzilla.gnome.org/show_bug.cgi?id=733864 > > Finally, CODA indicate that all buffer has been sent through an event, > V4L2_EVENT_EOS. This event was designed for another use case, it should > in fact be sent when the decoder is done with the encoded buffers, > rather then when the last decoded buffer has been queued. When correctly > implemented, this event cannot be used to figure-out when the last > decoded buffer has been dequeued. > > During last workshop, it has been proposed to introduce a flag on the > last decoded buffer, _LAST. This flag could also be put on an empty Are you planning to work on this? That was my assumption, but it's probably a good idea to check in case we are waiting for one another :-) Regards, Hans > buffer to accommodate driver like MFC that only know it's EOS after the > last buffer has been delivered. This all need to be SPECed and > implemented. If you need to get that to run now, the easiest might be to > hack CODA to mimic MFC behavior. Implement DEC_CMD_STOP in GStreamer > shall not be very hard though, it simply need someone to do it. > > cheers, > Nicolas > > -- > 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 > -- 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
