wader/fq
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fq/format/mp4/mp4.md
Mattias Wadman e3ae1440c9 interp: Rename to/from<format> functions to to_/from_<format> 
Feels less cluttered, easier to read and more consistent.

Still keep tovalue, tobytes etc that are more basic functions this
only renamed format related functions.
Also there is an exceptin for to/fromjson as it comes from jq.

Also fixes lots of spelling errors while reading thru.
2022-12-21 17:48:39 +01:00

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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