Organisation internationale de normalisation

m35145 Suggested update to ISO base media file format 14496-12

We need to state that the table in section 6 does not establish ordering.

On 4CCs we need to remove, or update the reference to ISO 8859-1, and we need to document the notation on how to insert control codes, when a 32-bit code that contains non-printable 8-bit values is used. We need to document ‘printable’ (used in many places). Can we refer to the C standard on how a single-quote enclosed string is encoded? We need to be clear it is the Unicode code-point value and not the UTF-8 encoding (which would be two bytes for characters above 0x7F), or say that ‘printable’ means only the LATIN-1 range (not the supplement).

We think we should document that characters must be (a) printable and (b) from the range 0-0x7F, or else another notation is used. The RA uses $20 to mean space and probably needs an update. We should recommend not using control codes. What is the escape syntax when non-printable characters are used? Or do we tell people to use hex without quotation marks? (item_type=0x45F4A280).

Conclusion: define printable (no control codes), define the 4CC syntax as using only characters from 0-0x7F that are also printable. Into defect report. [Dave]

On meta-box, primary_item for a ‘null’ handler – pick one. We should recommend not using the XML and binary XML boxes, and suggest items whose type indicate that their body is XML. We insert a paragraph saying the meta box was originally designed for metadata but now has more general applicability to untimed data. [Dave]
Yes, Annexes B and F gets ‘void’ in the new edition. The chair to do one more check with secretariat on Annex B. Note that the introduction refers to Annex B. [Editors]
We prefer to reference Unicode over 8859-1, and we need C0 and the UTF-8 definition (‘represented by a single byte in UTF-8’). Since the printable range is contiguous, we should simply document it (0x20 – 0x7E inclusive).

6.