Low-Latency: Overlap decoding

[haudiobe]

Background: In low-latency case, it may be needed that an existing segment download is terminated and the buffer is overwritten with new media data that overlaps on the same timeline.

CMAF Content: regular content for Audio and Video Profile

Test: Add content segment half way. Append a CMAF header. Add a new CMAF Fragment that overlaps with the timeline of the initial segment

Observation: Clean Switch

[haudiobe]

May be two tests:

• CMAF Header appended
• CMAF Header not appended Also need to exactly define what the overlap can be.

[jpiesing]

I don't completely understand the issue here. Please can you give an example based on (say) 8s DASH segments made up of 2s CMAF chunks. Please remember that reading the data from the network is done by the DASH player. If the DASH player reads in (say) a DASH segment of 4 CMAF chunks and then, for some reason, the last CMAF chunk is to be discarded then the DASH player can just read in more data starting with the last CMAF chunk of that segment. If the 4 CMAF chunks have already been appended to the SourceBuffer then new data can be appended overlapping them.

How does this differ from 8.10 Overlapping Fragments?

[haudiobe]

This is a new use cases, that would require new test content as well as a more detailed description. Considered as an enhancements for the future.

[gitwjr]

Deferred.