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Speed up decoding by not decoding samples

# manually decode first sample as a aac_frame
$ fq -o decode_samples=false '.tracks[0].samples[0] | aac_frame | d' file.mp4

Entries for first edit list as values

$ fq 'first(grep_by(.type=="elst").entries) | tovalue' file.mp4

Whole box tree as JSON (exclude mdat data and tracks)

$ fq 'del(.tracks) | grep_by(.type=="mdat").data = "<excluded>" | tovalue' file.mp4

Force decode a single box

$ fq -n '"AAAAHGVsc3QAAAAAAAAAAQAAADIAAAQAAAEAAA==" | from_base64 | mp4({force:true}) | d'

Lookup mp4 box using a mp4 box path.

# <decode value box> | mp4_path($path) -> <decode value box>
$ fq 'mp4_path(".moov.trak[1]")' file.mp4

Get mp4 box path for a decode value box.

# <decode value box> | mp4_path -> string
$ fq 'grep_by(.type == "trak") | mp4_path' file.mp4

References