I have the same problem since starting to use LE 10 on my RPi 4 with TVHeadend for Live TV. I have some intermittent issues which cause the picture to freeze but the audio keeps playing. I know that the stream has no errors since I have no stream errors in TVHeadend and no network errors. The only error I get in KODI is always: ... WARNING <general>: OutputPicture - timeout waiting for buffer ...
In the config.txt I have already tried core_freq_min=500 and in advancedsettings.xml:
<cache>
<buffermode>1</buffermode>
<memorysize>41943040</memorysize>
<readfactor>4.0</readfactor>
</cache>
Perhaps someone knows more on this error...