Comments (2)
Best practice: registered with a single definition.
Next best practice: contextual parsing (as above, depending on the container)
Next worst practice: contextual parsing based on something else (e.g. if in a track with the XXX handler type or YYYY handler type, where that is far away from the box)
Unacceptable practice: collision with no disambiguation possible.
from mp4ra.github.io.
Propose changing this on the home page
The registered code-points include four-character codes (4CCs) used in various ways within these file formats, and ObjectTypeIndication values used in MPEG-4 systems. The four-character codes are divided into various categories, for convenience. The largest category is the box (atom) types. The only box (atom) types which are not normally registered are boxes that are within the sample entry (sample description) for, and specific to, a codec or family of codecs, or that are used in a specific coding system (e.g. boxes used in a specific hint track).
to
The registered code-points include four-character codes (4CCs) used in various ways within these file formats, and ObjectTypeIndication values used in MPEG-4 systems. The four-character codes are divided into various categories, for convenience. The largest category is the box (atom) types.
The current best practice is to register all box (atom) types. Historically, some that were clearly contextual were not registered, notably those
- within the sample entry (sample description) for, and specific to, a codec or family of codecs, or
- that are used in a specific coding system (e.g. boxes used in a specific hint track).
from mp4ra.github.io.
Related Issues (20)
- [Website] grid item reference type is probably not correct
- [Website] Possibly missing item reference - auxr from CENC
- [Website] Hint statistics child boxes are missing
- swre: Name and version number of the software that generated this movie HOT 1
- cvvc collision HOT 3
- apac Apple Positional Audio Codec HOT 2
- Add missing 4CCs from ISO/IEC 14496-15:2022/Amd. 1:2023 HOT 1
- [Website] Preview 4CCs that are not yet registered but are in the pipeline. HOT 1
- ISOBMFF 8th Edition: new brand `isod` HOT 1
- ISOBMFF 8th Edition: new EntityGroup `prsl` HOT 1
- ISOBMFF 8th Edition: new track reference `aest` HOT 1
- ISOBMFF 8th Edition: new boxes HOT 1
- ISOBMFF 8th Edition: new/missing Sample Groups HOT 1
- ISOBMFF 8th Edition: incomplete tracks, restricted sample-entry codes
- Compatible scheme type box `csch` missing in registry, but published with ISOBMFF 7thEd HOT 1
- ISOBMFF 8th Edition: new scheme type `spki` HOT 1
- ISOBMFF 8th Edition: new scheme type `spkt` HOT 1
- ISOBMFF 8th Edition: new box `hdlp` handler property HOT 1
- Missing auxr item reference
- Auro-Cx Specific data `acxd` HOT 2
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from mp4ra.github.io.