It is all about the proprietary codec, i.e. IMM5. The VLC and FFMPEG can't deal with it except patching the avcodec manually using https://email@example.com/. Of course, you need to re-compile the ffmpeg using the IMM5 supported avcodec lib.
Use MediaInfo to get technical information for a media file.
The codec id in the video section will print the exact identifier stored in the file for that video stream. The format entry in the same section will print the formal name of that codec.