-hdtoonsplay- Snc Th Hd9h9 2020 X26... -

FFmpeg can copy streams and rewrite headers, ignoring errors.

ffmpeg -err_detect ignore_err -i "input.mkv" -c copy -map 0 -f mp4 "output_fixed.mp4"

One of the trickiest parts of playing scene releases (Snc) from 2020 is the "Th" (Thai or forced subtitle tracks). Often, HDToonsPlay rip groups mux multiple subtitle languages. -HDToonsPlay- Snc Th Hd9h9 2020 X26...

How to sync subs for the "-HDToonsPlay-" archive: FFmpeg can copy streams and rewrite headers, ignoring errors

Before attempting to play or fix anything, let’s analyze the probable meaning of each fragment: One of the trickiest parts of playing scene

Conclusion from analysis: You are not looking for a mainstream movie or series. You are likely dealing with a user-created file, a misnamed download from a torrent or direct download (DDL) site, or a recovered fragment from a damaged hard drive.