Correct audio segments scheduling in live mode #2668
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… level computation at startup
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In live mode, until the first video segment is appended, the audio scheduling (via the BufferLevelRule) was considering audio buffer level always equal to 0.
Then in case 1st video segment takes some time to be downloaded, this can lead scheduler to request audio segments at live edge before they are available.
With this PR audio scheduler is correctly aligned with video scheduler.