The situation with VC-1 is getting clear. RPI4 decodes it by software. Kodi is using ffmpeg and its implementation is only single-threaded (see pending new feature #1885). So there isn't any easy way how to resolve this.
Posts by keny
-
-
I confirm the problem with VC-1 at RPI4 running LibreELEC Beta 1. The playback is not smooth. Monitoring CPU usage, it is visible that one CPU core is running at almost 100%, while other CPU cores are idle.
-
I don't think it is enconding issue, because non-overclocked RPi experiences more drops than overclocked one.
My VLC also stucks at one frame, but I believe it is because of slow laptop (CPU is at max.).
-
I don't have an extensive library of HEVC material but everything I've tried has played flawlessly. Sorry.
Hi milhouse,
I have a DVB-T2 recording in 1080p HEVC, which encounters drops and skips during playback on RPi 3B+. I tried your recommended overclock settings. It helped to reduce the drops, but not fully. I run LE 9 night build #0328.
Here is a sample (45MB), so you can try. At the beginning it plays smoothly (slow motion), but later on I experience drops (fast motion). Any idea, what could be tuned to get smooth playback? The bitrate doesn't look big. Also CPU doesn't look like to be used at max. HEVC samples from Jellyfish Bitrate Test Files for 10 mbps bitrate can max out RPi CPU to 100% for all cores momentarily and still without drops. So I am wondering where is the actual bottleneck.
Thanks,
Keny
