International organisation for standardisation organisation internationale de normalisation

Contributions

Number	Session	Title	Source	Dispositions
m32255	File Format	Sync Sample Signalling in Multi-Layered HEVC Extensions	Vinod Kumar Malamal Vadakital, Miska M. Hannuksela	Noted
m32256	File Format	Signalling of Region of Interest Enhancement layers in Layered HEVC	Vinod Kumar Malamal Vadakital, Miska M. Hannuksela	Rejected
m32257	File Format	Proposal for an unified 14496-15 annex for all multi-layered HEVC extensions	Vinod Kumar Malamal Vadakital, Miska M. Hannuksela	Accepted N14123
m32260	File Format	File format extensions for multi-layered HEVC sequences	Vinod Kumar Malamal Vadakital, Miska M. Hannuksela	Noted
m32284	File Format	Clarifications on HEVC Tile Tracks	Jean Le Feuvre, Cyril Concolato, Franck Denoual, Frédéric Mazé, Eric Nassor	Accepted N14123
m32285	File Format	Multi-Layer HEVC and Tile Tracks	Jean Le Feuvre, Cyril Concolato, Franck Denoual, Frédéric Mazé, Eric Nassor	Accepted N14123
m32286	File Format	Multi-Layer HEVC Dependencies	Jean Le Feuvre, Cyril Concolato, Franck Denoual, Frédéric Mazé, Eric Nassor	Accepted N14123

3. Summary of discussions

1. m32255 Sync Sample Signalling in Multi-Layered HEVC Extensions

We note that the ‘ras ‘ sample group provides similar functionality, and perhaps we might never have had a sync sample table if we had had sample groups back then. Rather than re-designing the sync sample box, we would prefer to point people at the mechanism we prefer. Indeed, we have a historical accumulation of tools here, and we could deprecate some in a scalable HEVC context (e.g. pre-roll sample groups). We note that the sync sample table does enable some codec-unaware operations (e.g. deriving parts of timelines, fragmentation at RAP boundaries). We prefer not to re-design the sync sample table.

We should check that part 12 is clear that a sync sample is both a decoding and presentation clean start.

We have ‘rap’, ‘sap’ (proposed), ‘ras’, ‘roll’, ‘sync’ sample groups, and the sync sample table; this is too many; we should try to simplify, with perhaps a new part 12 definition and some deprecation.

We want to study both these problems further.

2. m32256 Signalling of Region of Interest Enhancement layers in Layered HEVC

It seems that the tracks all need to indicate precisely what they provide, within them. Providing a ‘fast hint’ in the track references seems like a dangerous door to open. If we want fast tagging, couldn’t it, or shouldn’t it, be a tag within the track rather than the nature of the reference.

3.