Thanks to @ferdnyc for the suggestion to better detect alpha channels.

[jonoomph]

Related to #609. Implementing a much improved alpha channel detection method, which works on all formats that contain an alpha channel. Shout out to @ferdnyc for the suggestion!

[codecov]

Codecov Report

Merging #620 (d6ec5da) into develop (5cc0455) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #620      +/-   ##
===========================================
- Coverage    52.32%   52.25%   -0.08%     
===========================================
  Files          129      129              
  Lines        10791    10773      -18     
===========================================
- Hits          5646     5629      -17     
+ Misses        5145     5144       -1     

Impacted Files	Coverage Δ
src/FFmpegUtilities.h	100.00% <100.00%> (+4.16%)	⬆️

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[jonoomph]

Sorry to disappoint, lol. I'm not opposed to dropping older FFmpeg support though. As long as we support the past 4 or 5+ years of FFmpeg (which I think is around FFmpeg 3.4), that seems very reasonable.

[ferdnyc]

@jonoomph
Well, Ubuntu 16.04 shipped with FFmpeg 2.8, and won't technically be EOL'd until April of this year. (It also still uses Python 3.5, which has been EOL'd for nearly a year already, so that's confusing.)

Come April, though, there's really no reason to support anything pre-3.4, as that's what was included in Ubuntu 18.04.