Eyevinn / hls-vodtolive / #971

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fix: prevent audio segment doubling on loadAfter with mismatched audio languages (#137)

* fix: prevent audio segment doubling when default audio target is reused

When a VOD with multiple audio languages is loaded after a VOD with a
single audio language, the HAS_AUDIO_DEFAULTS path maps all source
languages onto the same target group/language slot. This doubles (or
triples) the audio segment count, causing audio and video media sequence
counts to diverge over time in live sessions.

Add a guard variable to ensure only the first source language is loaded
into the default audio target, skipping subsequent languages that would
otherwise duplicate segments into the same slot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* test: add regression test for audio segment doubling on loadAfter

Verifies that when a VOD with 1 audio language is followed by a VOD
with 2 audio languages via loadAfter(), the video and audio media
sequence counts remain equal. Without the fix, audio sequences would
be doubled (46 vs 23).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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