h264: improve performance of AVCC unmarshaler

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 83.01%. Comparing base (2016386) to head (bee8030).

Files	Patch %	Lines
pkg/codecs/h264/avcc.go	78.94%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   82.98%   83.01%   +0.02%     
==========================================
  Files          75       75              
  Lines        6959     6969      +10     
==========================================
+ Hits         5775     5785      +10     
  Misses        864      864              
  Partials      320      320              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.