Stuttering Video on Raspi 4 with TvHeadend

Hi All

I am running a TV-Headend Server on a Synology Box to feed several devices in my home.

Lately I did an upgrade to Raspi 4 on a TV. Installation is Ok, the Raspi is capable of running up to 4k Video; BUT:

SD-Video from TV-Headend has major problems, The picture is stuttering and lagging behind the Audio Stream.

As TV-Headend was working perfectly on all other Devices (Android, Windows, Odroid/Librelec 8 ) It surely did look like a Codec Problem on the Raspi for me...

So I checked the Raspi Homepage for the MPEG-1 Codec; not available anymore for Raspi 4.

I think the Raspi 4 does have enough Power to decode MPEG-1 in Software, So maybe somebody knows a Workaround or can implement a permanent solution.

OR, if a am totally wrong, maybe somebody can tell what the real problem is and how to fix it

CU Frank

Hi, found the solution, after changing everything from Network Cable to MicroSD.

Libreelec on Raspi 4 is not able to upscale SD-Television to 4k Screen resolution.

If you reduce the Screen resolution, the stuttering and delay stops.

Fun fact, I had to go down to 720p and then could go up to 1080p; simply downgrading to 1080p was not successful.

Result: You have to decide currently which is more needed; SD-Television or 4k Videos. Upgrading to as Raspberry Pi for 4k reasons does not make Sense as long as You are watching SD-Television. Also 720p-TV, (Standard for german public HD-TV) shows some minor glitches

CU Frank

P.S. Initial Testing was done with 9.2.1; 9,2,3 was reacting exactly the same..

Hi Thanks for the hints, but to my Understanding I was doing neither nor.

I kept the Kodi resolution to 1080p, as I know, that this might improve the performance of the Interface itself. The only thing I did was to increase the screen resolution to 3840x2160. This is even possible in Standard Mode of Settings.

How to whitelist Videomodes, I have not the slightest clue.

Maybe it would be good to add these settings already in the installation package so everybody who makes a plain install like me is benefitting from them ?!?

Thanks for the hint

Instead of browsing through the Kodi Wiki, I tried installing Coreelec on my 4 Years old Odroid2.

Surprisingly it was able to run both 4k Video and SD-Television with the 3840x2160 resolution selected.

So I leave Libreelec for now and hope for a similar functionality in the future

Thanks again and hopefully until the near future

Frank