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mp4,doc: Add JSON box tree example and reorder a bit

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This commit is contained in:
Mattias Wadman 2022-12-15 14:15:31 +01:00
parent 502e1e3059
commit 1dea40e6af
3 changed files with 71 additions and 54 deletions
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44
doc/formats.md
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@ -705,6 +705,31 @@ Decode value as mp4
... | mp4({allow_truncated:false,decode_samples:true})
```
### Speed up decoding by not decoding samples
```sh
# 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
```sh
$ fq 'first(grep_by(.type=="elst").entries) | tovalue' file.mp4
```
### Whole box tree as JSON (exclude mdat data and tracks)
```sh
$ fq 'del(.tracks) | grep_by(.type=="mdat").data = "<excluded>" | tovalue' file.mp4
```
### Force decode a single box
```sh
$ fq -n '"AAAAHGVsc3QAAAAAAAAAAQAAADIAAAQAAAEAAA==" | frombase64 | mp4({force:true}) | d'
```
### Lookup mp4 box using a mp4 box path.
```sh
@ -719,25 +744,6 @@ $ fq 'mp4_path(".moov.trak[1]")' file.mp4
$ fq 'grep_by(.type == "trak") | mp4_path' file.mp4
```
### Force decode a single box
```sh
$ fq -n '"AAAAHGVsc3QAAAAAAAAAAQAAADIAAAQAAAEAAA==" | frombase64 | mp4({force:true}) | d'
```
### Speed up decoding by not decoding samples
```sh
# 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
```sh
$ fq 'first(grep_by(.type=="elst").entries) | tovalue' file.mp4
```
### References
- [ISO/IEC base media file format (MPEG-4 Part 12)](https://en.wikipedia.org/wiki/ISO/IEC_base_media_file_format)

44
format/mp4/mp4.md
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@ -1,3 +1,28 @@
### Speed up decoding by not decoding samples
```sh
# 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
```sh
$ fq 'first(grep_by(.type=="elst").entries) | tovalue' file.mp4
```
### Whole box tree as JSON (exclude mdat data and tracks)
```sh
$ fq 'del(.tracks) | grep_by(.type=="mdat").data = "<excluded>" | tovalue' file.mp4
```
### Force decode a single box
```sh
$ fq -n '"AAAAHGVsc3QAAAAAAAAAAQAAADIAAAQAAAEAAA==" | frombase64 | mp4({force:true}) | d'
```
### Lookup mp4 box using a mp4 box path.
```sh
@ -12,25 +37,6 @@ $ fq 'mp4_path(".moov.trak[1]")' file.mp4
$ fq 'grep_by(.type == "trak") | mp4_path' file.mp4
```
### Force decode a single box
```sh
$ fq -n '"AAAAHGVsc3QAAAAAAAAAAQAAADIAAAQAAAEAAA==" | frombase64 | mp4({force:true}) | d'
```
### Speed up decoding by not decoding samples
```sh
# 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
```sh
$ fq 'first(grep_by(.type=="elst").entries) | tovalue' file.mp4
```
### References
- [ISO/IEC base media file format (MPEG-4 Part 12)](https://en.wikipedia.org/wiki/ISO/IEC_base_media_file_format)

37
format/mp4/testdata/help_mp4.fqtest vendored
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@ -19,6 +19,27 @@ Decode examples
# Decode value as mp4
... | mp4({allow_truncated:false,decode_samples:true})
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==" | frombase64 | mp4({force:true}) | d'
Lookup mp4 box using a mp4 box path.
====================================
@ -31,22 +52,6 @@ Get mp4 box path for a decode value box.
# <decode value box> | mp4_path -> string
$ fq 'grep_by(.type == "trak") | mp4_path' file.mp4
Force decode a single box
=========================
$ fq -n '"AAAAHGVsc3QAAAAAAAAAAQAAADIAAAQAAAEAAA==" | frombase64 | mp4({force:true}) | d'
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
References
==========
- ISO/IEC base media file format (MPEG-4 Part 12) (https://en.wikipedia.org/wiki/ISO/IEC_base_media_file_format)