Hi Philipp, 2014-12-18 17:52 GMT+01:00 Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>: > 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. Where can we find the register definitions ? In order to look at it before asking you :) ? Thanks, JM -- 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
