imx6 / mainline linux / basic problems

[Ian Molton]

On 05/02/15 11:18, Carlos Rafael Giani wrote:
>
> OK, this indeed is slow. What if you try this pipeline?
> gst-launch-1.0 filesrc
> location=/home/H264_test1_Talkinghead_mp4_480x360.mp4 ! qtdemux !
> h264parse ! v4l2video1dec ! fakesink
>
> Upon terminating, gst-launch prints how long the pipeline was
> running. Compare this with the duration of the video. What results do
> you get?

I don't - the Debian package has a bug and never exits.

That said, the VPU interrupt rate looks to be well over the framerate,
and it does nominally 1int per frame.

I don't think the VPU is the issue.

Further benchmarks:

------
gst-launch-1.0 filesrc location= /home/ian/Downloads/big_buck_bunny_1080p_h264.mov ! qtdemux ! h264parse ! queue ! v4l2video5dec ! fakesink sync=false

Bus:
   Read: 425.43 MB/s /  Write: 304.08 MB/s  Utilization: 10%
CPU: ~4%

------
gst-launch-1.0 filesrc location= /home/ian/Downloads/big_buck_bunny_1080p_h264.mov ! qtdemux ! h264parse ! queue ! v4l2video5dec ! videoconvert ! fakesink sync=false

Bus:
   Read: 400.48 MB/s /  Write: 285.61 MB/s  Utilization: 10%
CPU: ~4%

------
gst-launch-1.0 filesrc location= /home/ian/Downloads/big_buck_bunny_1080p_h264.mov ! qtdemux ! h264parse ! queue ! v4l2video5dec ! videoconvert ! fbdevsink sync=false

Bus:
   Read: 325.07 MB/s /  Write: 18.91 MB/s  Utilisation: 5%
CPU: ~25% (1 core @ 99%)

*VPU interrupt rate is about 1/25th the above tests too, about 2FPS.


I think the videoconvert plugin is a no-op when connected to a fakesink. Would explain the lack of change in performance.

looks like videoconvert has abysmal performance on an ARM for some reason.

I'm attempting to compile gstreamer-plugins-good to get a better look at this.

-Ian