JLSEC-2025-116 Prior to ffmpeg version 4.3, the tty demuxer did not have a '`read_probe`' function assigned to it

Prior to ffmpeg version 4.3, the tty demuxer did not have a 'readprobe' function assigned to it. By crafting a legitimate "ffconcat" file that references an image, followed by a file the triggers the tty demuxer, the contents of the second file will be copied into the output file verbatim as long...