I have set up my raspberry pi 3 with LibreElec as my OS. I installed the
Amazon VOD plugin in order to access Amazon Prime Video. After a little manual tweaking I am now able to get the HD video streams.
However when playing the HD streams (that is 1920x1080 at either 15 or 8Mbit) all cores of my RPi are essentially at 100% making the video stuttering. With 1280p it works just fine (although the CPU is pretty busy as well).
From my internet research on the whole topic I found out that in general it shouldn't be a problem to play 1920x1080 videos on the Pi (YouTube at 1280p runs smoothly and the CPU isn't used above 20% or so) so I suspect that the problem lies in the decoding of the video stream (This uses widevine).
My question is: Is there a way to speed up the decoding of those video streams? Like some sort of hardware-acceleration (The streams are listed as h264)? Or maybe an extra piece of hardware for that purpose?