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60 lines
1.7 KiB
Plaintext
60 lines
1.7 KiB
Plaintext
$ fq -h mp4
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mp4: ISOBMFF, QuickTime and similar decoder
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Options
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=======
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allow_truncated=false Allow box to be truncated
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decode_samples=true Decode samples
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Decode examples
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===============
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# Decode file as mp4
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$ fq -d mp4 . file
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# Decode value as mp4
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... | mp4
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# Decode file using mp4 options
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$ fq -d mp4 -o allow_truncated=false -o decode_samples=true . file
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# Decode value as mp4
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... | mp4({allow_truncated:false,decode_samples:true})
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Speed up decoding by not decoding samples
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=========================================
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# manually decode first sample as a aac_frame
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$ fq -o decode_samples=false '.tracks[0].samples[0] | aac_frame | d' file.mp4
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Entries for first edit list as values
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=====================================
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$ fq 'first(grep_by(.type=="elst").entries) | tovalue' file.mp4
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Whole box tree as JSON (exclude mdat data and tracks)
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=====================================================
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$ fq 'del(.tracks) | grep_by(.type=="mdat").data = "<excluded>" | tovalue' file.mp4
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Force decode a single box
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=========================
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$ fq -n '"AAAAHGVsc3QAAAAAAAAAAQAAADIAAAQAAAEAAA==" | from_base64 | mp4({force:true}) | d'
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Lookup mp4 box using a mp4 box path.
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====================================
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# <decode value box> | mp4_path($path) -> <decode value box>
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$ fq 'mp4_path(".moov.trak[1]")' file.mp4
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Get mp4 box path for a decode value box.
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========================================
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# <decode value box> | mp4_path -> string
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$ fq 'grep_by(.type == "trak") | mp4_path' file.mp4
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References
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==========
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- ISO/IEC base media file format (MPEG-4 Part 12) (https://en.wikipedia.org/wiki/ISO/IEC_base_media_file_format)
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- Quicktime file format (https://developer.apple.com/standards/qtff-2001.pdf)
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