[mythtv-users] Mythfrontend failing to display subtitles for some type of file

[John Pilkington]

On 04/09/2022 13:36, Paul Gardiner wrote:
> One further discovery: if I demux the orifinal file to produce two 
> files, one containing combined video and audio, the other (a .srt file) 
> containing just the subtitles, mythfrontent displays the subtitles 
> without problem. The logs suggest this mode uses a very different code 
> path, so the experiment didn't help track down the cause.
> 
> I wonder if, in the failing case - without demuxing, the subtitles are 
> being displayed off screen or with opacity 0. Perhaps it's silently 
> failing to load a font. The logs show events as each subtitle should be 
> displayed.
> 
> At the moment I can't think of a way to track this down further.

I habitually drop subtitles, so don't have much practical experience; 
but your posted log included

AFD: ScanATSCCaptionStreams() called with no PMT

which doesn't look good.

I posted my 'typical' remux command line on the dev list on Tuesday.  It 
migh be worth adding an 'scodec copy' phrase to that;  and use 
mythffmpeg...

HTH

John P