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cta-wave / device-playback-task-force

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Low-Latency: Short Buffer Playback #78

Closed haudiobe closed 2 years ago

haudiobe commented 4 years ago

Background: In low-latency, typically playback is done based on only a short buffer duration.

CMAF Content: Create CMAF Chunked content with chunk durations in the range of Low-Latency playback

Stimulus: Fill chunk by chunk on a frequent basis

Expected Playout Behaviour: It works

haudiobe commented 4 years ago

Check if this test is already documented

jpiesing commented 4 years ago

The AVC content options (https://1drv.ms/w/s!AiNJEPgowJnWgbpZesbLvglzCXVlSg?e=4ZFRyB) say the following.

CMAF Fragment durations o 2 seconds o 5 seconds

Is this what you mean?

dsilhavy commented 3 years ago

Again might need to consider minimum buffer level required on specific platforms. If a CMAF chunk corresponds to a single frame multiple chunks might be required for playback to start. Consequently, playback might stall for different platforms at different buffer levels.

jpiesing commented 3 years ago

Suppose an implementation requires a minimum of (say) 5s buffered and will stall when the buffer size drops below that. That's clearly not a low latency enabled implementation. Is it surprising if it would fail such a test? The test could be made configurable so that particular content providers could require the test to be passed with at least a certain value in order to have access to their content.

dsilhavy commented 3 years ago

Suppose an implementation requires a minimum of (say) 5s buffered and will stall when the buffer size drops below that. That's clearly not a low latency enabled implementation. Is it surprising if it would fail such a test? The test could be made configurable so that particular content providers could require the test to be passed with at least a certain value in order to have access to their content.

I like that approach

haudiobe commented 2 years ago

part of new test cases.