various performance improvements

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 63.15789% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 81.42%. Comparing base (3f62e11) to head (108666e).
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/format/h264.go	0.00%	3 Missing ⚠️
pkg/format/h265.go	0.00%	3 Missing ⚠️
pkg/format/rtpmjpeg/encoder.go	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #561      +/-   ##
==========================================
- Coverage   81.49%   81.42%   -0.08%     
==========================================
  Files         115      115              
  Lines       11473    11482       +9     
==========================================
- Hits         9350     9349       -1     
- Misses       1721     1729       +8     
- Partials      402      404       +2     

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