On 2022-03-29 20:15, Ramon Brea wrote:
        I’ve been converting my physical movies to m2ts and using mkvtoolnix to 
convert them to mkv format with the intent of eventually converting them to mp4 
for playback on most devices. Thats why I want the mkv or mp4 file to have 
burn-in/hardcoded subs. The subtitles are PGS or .sup format, which is a 
picture based format. I’ve been reading the overlay video filter section of the 
ffmpeg site. I'm trying to overlay (burn-in/hardcode) the pgs subtitles over 
the video stream without having to re-encode the video file and lose picture 
quality. Is this possible?

No. Burning in makes the subs part of the pictures.
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