obs-outputs: Set FLV DTS offset based on first audio or video packet #10999
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Description
Ensures that PTS/DTS for audio start at 0 if there by ensuring the DTS offset is based on the first packet that comes in, regardless of whether or not it's video (b-frame delay), or audio (priming sample delay).
Motivation and Context
Fixes #10998
This became necessary due to #10689 and #10690 which fix handling of audio priming samples with negative timestamps. Note that if users have a sufficiently large number of b-frames configured (1 is enough) this currently doesn't actually cause any issues.
How Has This Been Tested?
Logged output packets and ensured the resulting FLV files are playable.
Types of changes
Checklist: