Add H264 support to save-to-webm

[Sean-Der]

Supports VP8 still

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 61 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (668b936) to head (55afe2a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
save-to-webm/main.go	0.00%	57 Missing ⚠️
unreal-pixel-streaming/main.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #242   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          25      25           
  Lines        2252    2297   +45     
======================================
- Misses       2252    2297   +45     

Flag	Coverage Δ
go	0.00% <0.00%> (ø)
wasm	0.00% <ø> (ø)

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