fq has mp4 support https://github.com/wader/fq https://github.com/wader/fq is quite visual but is a CLI tool (for now). It has a REPL and query language to poke

fq has mp4 support https://github.com/wader/fq https://github.com/wader/fq is quite visual but is a CLI tool (for now). It has a REPL and query language to poke around. Disclaimer: i'm the author. Other mp4 tools i use are https://gpac.github.io/mp4box.js/test/filereader.html https://gpac.github.io/mp4box.js/test/filereader.html and the tools from bento4, also ffmpeg -v trace can give some useful output.