mkvmerge: Timed Text subtitles inside MP4 container is not identified
I've uploaded to your ftp "Your Friend the Rat (2007).mp4" file where mkvmerge can't identify "Timed Text" subtiltes inside.
File's MediaInfo: https://pastebin.com/qgm9jhSV
MkvMerge output: https://pastebin.com/R4ARXYPz
MP4Box output: https://pastebin.com/9T3YDaiW