Choppy playback on Philips Android TV with PVR TVH Client

Setup:
– TVHeadend v4.1-2309 with a user configured with the HTSP streaming profile
– DVB-S tuner providing the channels, including SD, HD and UHD channels (typically all of it is interlaced content, 576i50 or 1080i50)
– Philips 55PUS8601 Android TV which has an MTK5593U+ SoC (similar to the one used in Sony Android TVs)

The problem I’m seeing is when using the PVR add-on to connect to my TVHeadend server. After loading the channels and EPG, whenever I select a channel, the video playback is very choppy (looks like max. 10fps in my eyes vs the expected 50fps). The audio sounds good.

I created a debug log for this behavior, but I’m not sure if it contains enough info. Perhaps I need to enable certain log components? The log can be found here. BBC One HD gets opened, letting it play for a while and then I closed it. Some more info from Kodi about my Philips TV can be found here.

I also installed an app called TVHClient on my TV and this one provides HTTP links which I then open with Kodi. When I do that, everything plays just fine. As far as I know, no transcoding is going on in that usecase, so it’s purely the channel’s stream that’s being delivered to Kodi. Which would indicate that my TV should be capable of handling this type of content.