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MPEGGroup / CMAF

Official MPEG repository to discuss public issues on CMAF (ISO/IEC 23000-19)
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nmhd is missing in Table 3 #13

Closed RufaelDev closed 3 years ago

RufaelDev commented 3 years ago

Table 3 of CMAF specification misses the null media header (nmhd), but this is used for CMAF metadata and wvtt tracks!

please confirm/comment about this as to avoid confusion about the usage of this box in CMAF.

Thank you!

sdp198 commented 3 years ago

I thought web VTT was removed from CMAF in the early drafts stage?

For metadata, it might be easier to add this at the point that a CMAF Metadata profile is added?

cconcolato commented 3 years ago

@sdp198 Section 11 of CMAF covers Subtitles, and it includes WebVTT and TTML. Section A.4 defines Subtitle CMAF media profiles and brands.

sdp198 commented 3 years ago

@sdp198 Section 11 of CMAF covers Subtitles, and it includes WebVTT and TTML. Section A.4 defines Subtitle CMAF media profiles and brands.

So it does. My mistake.

cconcolato commented 3 years ago

I think there is agreement on this issue and we should fix the spec when we can.

RufaelDev commented 3 years ago

agree with @cconcolato, while on it we also noticed the pssh box was missing in table 5 was this intentional ? Specification text is very clear that pssh box may be included , not having it in the table may cause confusion down the line.

cconcolato commented 3 years ago

The group discussed the issue and decided to add text to the amendment and to close this issue.