Backport #2972 to v3

[jech]

Backport of #2972 into v3.

Tested to do the right thing in Galene, thanks a lot Sean.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.90%. Comparing base (90222f6) to head (ed84fad).
Report is 1 commits behind head on v3.

Files with missing lines	Patch %	Lines
mediaengine.go	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #2973      +/-   ##
==========================================
- Coverage   80.16%   78.90%   -1.27%     
==========================================
  Files          78       78              
  Lines        7659     9318    +1659     
==========================================
+ Hits         6140     7352    +1212     
- Misses       1079     1528     +449     
+ Partials      440      438       -2     

Flag	Coverage Δ
go	78.90% <95.23%> (-1.27%)	⬇️

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