Raspberry pi hardware accelerated playback

[Matthew Waters]

On 22/03/17 23:35, David Ventura wrote:
> While it does help, it's way, way worse than it should be. Is this
> 'normal'? Is there any way to play back a gstreamer pipeline smoothly
> on a pi? This is 1280x720 at 25. Lowering the source bitrate helps a
> little, but it's not even that high to begin with.

If you actually built gst-omx and gst-plugins-bad correctly, you will
just get smooth playback of 1080p at 30 videos.

Have a look at the caps between omxh264dec and glimagesink if they do
not contain video/x-raw(memory:GLMemory) then the zerocopy path is not
being used.

The other thing to double check is the latency setting (10ms) on
rtpjitterbuffer be be too low for your network.

Cheers
-Matt

> David
>
> On 22 March 2017 at 07:56, Matthew Waters <ystreet00 at gmail.com
> <mailto:ystreet00 at gmail.com>> wrote:
>
>     On 22/03/17 04:15, David Ventura wrote:
>>     Hi. I've been trying to play either a udp h264 stream or a video
>>     file with hardware acceleration.
>>
>>     With this command I get VERY choppy playback, low cpu usage and a
>>     lot of banding:
>>
>>     gst-launch-1.0 -qe udpsrc port=5002 do-timestamp=true ! queue !
>>     application/x-rtp, payload=96 ! rtpjitterbuffer latency=10 !
>>     rtph264depay ! h264parse ! omxh264dec ! glimagesink
>
>     Adding a small queue after the decoder at least would decouple
>     video decoding from actual rendering which probably helps here.
>
>     As you have low CPU usage I assume you built gst-omx and
>     gst-plugins-bad correctly for zerocopy decoding which is good :)
>
>     Cheers
>     -Matt
>
>>     adding
>>
>>     enable-last-sample=false qos=false
>>
>>     to the glimagesink makes it somewhat better, but still horrible.
>>
>>     Similar thing (banding, low fps, low cpu usage) happens with:
>>     gst-launch-1.0 filesrc location=file.mp4 ! qtdemux ! h264parse !
>>     omxh264dec ! glimagesink
>>
>>     I compiled this version on my own, I'm running 1.11.1 right now.
>>
>>     What can I do about this?
>>     -- 
>>     *Stack* is the new term for "I have no idea what I'm actually using".
>
>
>
>
> -- 
> *Stack* is the new term for "I have no idea what I'm actually using".
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