Fix audio and playback issues

rbouqueau commented 3 years ago

Still some conformance issues. We are limited by our toolset.

Should implement the first step of #13 and fix #14.

jpiesing commented 3 years ago

. We are limited by our toolset.

Please could you give more details about these limits? What is blocked?

rbouqueau commented 3 years ago

Please could you give more details about these limits? What is blocked?

Points that I investigated but could not solve:

both the @timeline with MaxSegmentDuration and the sum of segment duration doesn't match the period duration (FFmpeg)
check during side experiments report inconsistent durations between segments and manifest (timeline) (FFmpeg)
the segments and manifest expressiveness are limited (that's why the script manipulates the manifest (while not checking the version of the tool that generates the manifest -> strong weakness and maintenance burden)) (FFmpeg + having tests)
lmsg/meta box warnings (FFmpeg + investigate conformance.dashif.org)
mixing avc1/avc3 silently (FFmpeg)
express role on audio (FFmpeg)
on the conformance side: when investigating I could generate streams with fairly different structures that were compliant - which lowered my confidence in the checker. We should do manual tests along the way and report at https://github.com/Dash-Industry-Forum/DASH-IF-Conformance/issues. Note that having an API for conformance.dashif.org would help for this work.
audio: support for absence of PCE (and maybe other) not supported (FFmpeg + investigate the audio list of requirements for w.r.t. this repo)
encryption: not support by FFmpeg

I have ideas to solve most of the points but imho we need consolidate the result from the this PR first.

cta-wave / Test-Content-Generation