FileMp4InputSettings.mediaSpeed property

Trick-play media-speed multiplier. Defaults to normal (1). Values greater than 1 fast-forward and values less than 1 slow-motion the media timeline (the frames' PTS/DTS are rewritten), unlike FileMp4InputSettings.playbackRate which only changes wall-clock pacing. Must be greater than 0. Pair with a downstream frame-rate-conversion node for clean constant-rate output; audio is dropped whenever the speed is not 1.

Not supported together with loop (the loop restart is a backward media-time jump, which trick-play retiming does not currently rebase); use a single non-looping pass at mediaSpeed != 1.

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