h264: filter out invalid NALUs from Annex-B

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.48780% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 83.01%. Comparing base (2016386) to head (6c2ac2a).

Files	Patch %	Lines
pkg/codecs/h264/annexb.go	80.48%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
+ Coverage   82.98%   83.01%   +0.02%     
==========================================
  Files          75       75              
  Lines        6959     6970      +11     
==========================================
+ Hits         5775     5786      +11     
  Misses        864      864              
  Partials      320      320              

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