Hi Jean-Michel, Am Donnerstag, den 18.12.2014, 17:55 +0100 schrieb Jean-Michel Hautbois: > 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 :) ? Sorry, forgot to put all of you on Cc: for the "[media] coda: fix encoder rate control parameter masks" patch. The coda driver is in drivers/media/platform/coda, register definitions in coda_regs.h. The CODA_RATECONTROL_BITRATE_MASK is 0x7f, but it should be 0x7fff. 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
