I hope that you enjoyed Saturday’s Mac Riddles, episode 144. Here are my solutions to them.
1: A brisk march for a minstrel shows movies.
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QuickTime Player
A brisk march (in quick time) for a minstrel (a player) shows movies (what the app does).
2: Between cipher b and d giving access to audio and video formats.
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codec
Between cipher (code) b and d (c) giving access to audio and video formats (what a codec does).
3: Sea can, partition, holding AV tracks.
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container
Sea can (slang for an ISO container in shipping), partition (an APFS container), holding AV tracks (what a QuickTime or AVAsset does).
The common factor
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All are parts of QuickTime and its successor AVFoundation.
I look forward to your putting alternative cases.