Summary of discussions m32253 Constraint Signalling for HEVC coded Still Images and Image Sequences
Accepted into the still image format with (a) maxrefpic==15 meaning ‘whatever the level allows’ and no optional box() at the end.
m32254 File format Support for Single HEVC Still Images
Thank you for the nice discussion of the various possibilities. We initially focused on the simple case (e.g. non-tiled, no layering etc.). We do need to consider tiling, scalability, and so on, at some point.
We noted that in option 3, we think that JP2/JPX were designed as “Jpeg2000 formats” and not layered as “still image formats” which initially are used to contain Jpeg2000. We think it would need a lot of work. However, we note that the both the track and meta-box options reference image data by pointer/offset, so it could indeed still be possible to have the image data in a ‘codestream’ box.
It’s clearly true that if sequences with times are needed or useful, a track structure does the job. But people on the web want to load images fast, and have something simple.
We note that there is a need for a format for responsive images, in which one can select an image from a set by choosing based e.g. on DPI. It’s not clear whether this drives us in any direction, however.
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