To enable compilation of this filter you need to configure FFmpeg with --enable-libass.
This filter accepts in input the name of the ass file to render.
For example, to render the file ‘sub.ass’ on top of the input video, use the command:
Hello, I got a Samsung E series TV that doesn't support ASS subtitle format.
When trying to Watch .MKV with embedded ASS nothing shows up using Serviio.
This is why we need on-the-fly ASS to SRT Convert done by Serviio for transcode.