Clarify values of AV1CodecConfigurationRecord fields.

[tomfinegan]

Add text explicitly stating the values for twelve_bit,
chroma_subsampling_x, chroma_subsampling_y, and
chroma_sample_position when not present in the Sequence
Header OBU.

Closes #102

[tomfinegan]

@VFR-maniac and @cconcolato ptal/thx!

[tomfinegan]

Rendered version:
https://cdn.rawgit.com/AOMediaCodec/av1-isobmff/2d5860ee38a6655584333d44abbf37e455b3bbbf/index.html

[cconcolato]

We should add a "Changes since v1.0.0" section.

[VFR-maniac]

There are no cases of absences of chroma_subsampling_x and chroma_subsampling_y at the current ver. of AV1 spec. It's for possible future versions?

[tomfinegan]

There are no cases of absences of chroma_subsampling_x and chroma_subsampling_y at the current ver. of AV1 spec. It's for possible future versions?

This wording is to handle the multiple cases where chroma_subsampling_x and chroma_subsampling_y have specified values but are not present in the Sequence Header OBU.

[tomfinegan]

We should add a "Changes since v1.0.0" section.

Added in c18b35c

[tomfinegan]

New render:
https://cdn.rawgit.com/AOMediaCodec/av1-isobmff/8046f1159a3176a1b7d1670495a4357f8e6dc2ba/index.html

[cconcolato]

• I wouldn't place the change log at the very beginning of the spec. I would put it last.
• Could you also add a "Last approved version" (or similar) at the top of the spec with a link to the v1.0.0 ?
• Shouldn't we add the "warning" back?

[tomfinegan]

I wouldn't place the change log at the very beginning of the spec. I would put it last.

Done.

Could you also add a "Last approved version" (or similar) at the top of the spec with a link to the v1.0.0 ?

We don't have this hosted anywhere yet. The rawgit trick works with the v1.0.0 tag, so I used that.

Shouldn't we add the "warning" back?

Done

[tomfinegan]

Updated render:
https://cdn.rawgit.com/AOMediaCodec/av1-isobmff/8e44a3118ae4eb01c9b1b31da678f7dc9a52cf92/index.html