Mark temporal point info metadata as suffix metadata

[xinzhao-apple]

Temporal point info is prefix metadata (is_suffix == 0), but it was written after the tile group OBUs. The decoder treats a prefix metadata OBU that follows a coded frame as the start of the next frame unit, so --timing-info=model produced a stream that failed to decode with "Unspecified internal error" on a nonexistent trailing frame.

Fix (Encoder only): Set is_suffix = 1 to match where the OBU is written.

[SMPaluri]

Thanks Xin, I think it could also just change is_suffix = 1 so that it is appended at the end. But what you have is fine. I meant to add an encoder cli to set is_suffix for all the metadata.

[xinzhao-apple]

Thanks Xin, I think it could also just change is_suffix = 1 so that it is appended at the end. But what you have is fine. I meant to add an encoder cli to set is_suffix for all the metadata.

Thanks Seethal for the review and approval, I've updated the PR to just is_suffix = 1. Much smaller change and the decoded output is identical. Agreed that an encoder CLI (in a separate commit) to set is_suffix for all metadata is the more systematic fix.