Hardware/GPU decoding of HEVC file on Android.

Michael MacIntosh mmacintosh at linear-systems.com
Mon Nov 13 21:22:12 UTC 2017

Since you are explicitly telling gstreamer to use the software decoder, 
(avdec_h265) it will use the software decoder.  You could try using 
playbin/decodebin and it might autoplug the correct hardware decoder.  
So it might be worth trying to see if you get better results using 
playbin.  I don't have specific experience with android gstreamer, so I 
don't know what the hardware accelerated decoder would be called.  Also 
plugins get loaded on-demand, so that would explain why you don't see it 
getting loaded.

On 11/13/2017 12:49 PM, Vishal Changrani wrote:
> Hi,
> I have been struggling to get an HEVC file to playout on an Nexus 9 
> tablet using the hardware decoder.
> I have followed the GStreamer examples for Android and was able to run 
> the examples as-is. Later I modified the tutorial 3 to use the 
> following pipeline,
> gst_parse_launch("filesrc location=/storage/emulated/0/myhevcfile.ts ! 
> tsdemux ! queue ! openh264 ! avdec_h265 ! autovideosink sync=false", 
> &error)
> This too works fine but the playout is really slow since I suppose its 
> using the software decoder. Hence I would like to change it to use the 
> Hardware decoder. The MX player seems to be using the hardware decoder 
> using the OMX plugin. I have been trying to do the same but without 
> any luck.
> I see that 'androidmedia' is listed as part of the 
> GSTREAMER_PLUGIN_CODECS which I have specified in the Android.mk file 
> however it doesn't seem to be loaded when the application starts while 
> all other plugins load fine. I don't see any 'ahc' error either. I 
> believe the OMX hardware decoder will be accessible through it, correct?
> Please can you give me some pointers on how to get the HEVC video to 
> playout using the hardware decoder?
> thanks,
> V
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> gstreamer-devel at lists.freedesktop.org
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