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h265parse: Reject FD received before SPS

Jordan Yelloz requested to merge jyelloz/gstreamer:h265parse-reject-fd-before-sps into main

A previous fix, a275e1e0, is correct but was too permissive since it treats all un-matched NAL units the same as AU delimiters even though some other NAL unit types can be encountered in the processing loop.

The problem this can cause is that some hardware decoders experience bad performance when handling FD units that precede the SPS.

This change restores the original behavior for FDs so that they're ignored until the SPS is received and it preserves the codec conformance test gains that the fix has achieved.

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