As a follow up on this(and you even have it showing in the remote logging as it was running when we encountered it).
I decided to experiment with some settings that were configured a long time ago.
Direct Play had been turned off. Setting the TCL TV to “Auto” for Direct Play seems to have allowed at least a few of the tested files to play back correctly near as we can tell.
So it looks like there is a transcoding specific issue at play here. Why it only impacts the new client, and not the old one is a mystery for you guys to resolve. At least we seem to have found a resolution to our playback problems on this content when 5.0.10 becomes the “live” version.
Edit: Of the slate of videos that had playback issues under forced transcodes, only 1 continues to present issues. And unsurprisingly, it also was the only one checked which was mpeg2 encoded(Marvel’s Agent Carter), which Roku cannot play natively.
However, playback was possible if “Allow Direct Streaming” was disabled, except playback then presented an audio desync with the video where it appears that video was being played at ~30FPS, but no frames were being dropped from the original 59.94 frame rate. Which once paired with Audio that was playing back at its normal rate resulted in “Runaway audio” that becomes increasing desynched as time progresses.