I have a couple of channels that no matter what won't play (default FFmpeg 1080 settings - except nvenc encoding turned on - though on or off, they don't play). The channels have the same settings as other - playlists made of TV and/or movies, and no matter what just time/error out. Is there something obvious (or not so obvious) that I should be looking for?

Thanks!

Can you be more specific? What error is displayed? Is there a corresponding error in the log file? You can edit filenames for privacy before posting if you use local libraries.

Sorry - not being intentionally vague. The actual error that pops up on the channels that won't play (there were three of them) is the same: Playback error. Could not tune channel. Please check your tuner or antenna
I wasn't able to find a related error in the log files for ErsatzTV or Plex, though I may not have been looking for the right thing
https://flic.kr/p/2oRzTun

    catfishman Please find and post (here, or in a private discussion available on my profile) an ETV log file from a day that contains a streaming attempt. Log files are in the ETV config folder / logs subfolder. On linux, the config folder is ~/.local/share/ersatztv. On Windows the tray icon has a shortcut to open the logs folder.

        jason Hey, so I did a reinstall of ErsatzTV and built up a list of playouts/channels, testing each until I ran into the error again - then I went and checked the log - I think the issue is mentioned here in this part ("Trek TV" failed to play like the previous channels did):

        2023-07-28 21:20:46.985 -06:00 [INF] Starting ts stream for channel 12
        2023-07-28 21:20:46.985 -06:00 [INF] ffmpeg arguments -nostdin -threads 1 -hide_banner -loglevel error -nostats -fflags +genpts+discardcorrupt+igndts -re -i http://localhost:8409/iptv/channel/12.m3u8?mode=segmenter -map 0 -c copy -metadata "service_provider=\"ErsatzTV\"" -metadata "service_name=\"Trek TV\"" -f mpegts pipe:1
        2023-07-28 21:20:47.027 -06:00 [WRN] Trim playlist failure; will return not found for channel 12
        2023-07-28 21:21:40.514 -06:00 [INF] Terminating HLS process for channel 11
        2023-07-28 21:21:47.118 -06:00 [INF] Terminating HLS process for channel 12
        2023-07-28 21:33:54.757 -06:00 [INF] Starting ts stream for channel 12
        2023-07-28 21:33:54.757 -06:00 [INF] ffmpeg arguments -nostdin -threads 1 -hide_banner -loglevel error -nostats -fflags +genpts+discardcorrupt+igndts -re -i http://localhost:8409/iptv/channel/12.m3u8?mode=segmenter -map 0 -c copy -metadata "service_provider=\"ErsatzTV\"" -metadata "service_name=\"Star Trek Channel\"" -f mpegts pipe:1
        2023-07-28 21:33:54.786 -06:00 [INF] Starting HLS session for channel 12
        2023-07-28 21:33:54.787 -06:00 [INF] HLS segmenter will work ahead for channel 12
        2023-07-28 21:33:54.802 -06:00 [INF] Unable to locate movie audio stream selector script; falling back to built-in logic
        2023-07-28 21:33:54.803 -06:00 [WRN] Unexpected pixel format null may have playback issues
        2023-07-28 21:33:54.887 -06:00 [INF] ffmpeg hls arguments -threads 0 -nostdin -hide_banner -nostats -loglevel error -fflags +genpts+discardcorrupt+igndts -hwaccel cuda -ss 00:25:06.9348801 -c:v hevc_cuvid -hwaccel_output_format cuda -i "V:\Movies\Star Trek The Motion Picture (1979)\Star Trek The Motion Picture 1979