Hi Frédéric, Am Donnerstag, den 18.12.2014, 17:44 +0100 schrieb Frédéric Sureau: > Hi > > I am trying to use the coda encoder through Gstreamer on an iMX6-based > board. > > I use the (rebased and slightly modified) gstv4l2h264enc plugin from: > https://github.com/hizukiayaka/gst-plugins-good > > This pipeline works fine: > gst-launch-1.0 -vvv v4l2src device=/dev/video4 ! > "video/x-raw,width=1280,height=720" ! videoconvert ! v4l2video0h264enc ! > h264parse ! mp4mux ! filesink location=test.mp4 > > When encoder has no bitrate param set (default=0), video encoding works > well, but bitrate reaches ~2.5Mbps > > When I try to set the bitrate with whatever value like 100,000 or > 1,000,000, the encoder produces video with bitrate around 480kbps and a > very poor quality. > > Here is the gstreamer pipeline I use with bitrate set: > gst-launch-1.0 -vvv v4l2src device=/dev/video4 ! > "video/x-raw,width=1280,height=720" ! videoconvert ! v4l2video0h264enc > extra-controls="controls,video_bitrate=1000000;" ! h264parse ! mp4mux ! > filesink location=test.mp4 > > The video_bitrate control seems to be correctly passed to the driver by > GStreamer since I can see the VIDIOC_S_CTRL call. > > Any idea ? There is a bug in the register definitions that causes the driver to apply a wrong mask before writing the bitrate to the register. I've got a fix for this in the pipeline, sending it right now. regards Philipp -- 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
