Проблемы с воспроизведением видео
Some files on my Mac in slow motion quick Time player how to remove it?
MacBook Pro 16″, macOS 15.0
Problems with video playback
Some files on my Mac in slow motion quick Time player how to remove it?
High frame rate videos or videos (accidentally) recorded in the slo-mo setting, could/would have extra sliders to allow setting a portion of it to be in slow motion. Could that be it? What is the frame rate of these videos?
If that matches, then you can set the start-point and stop-point of the slo-mo together at the beginning or end of the video, then save. You can also convert using external tools that ignore the slo-mo options.
*Adjust slo-mo effect in QuickTime Player on Mac
Trim video length, adjust speed, and edit audio on iPhone - Apple Support (hold iPhone horizontal)
Open and play a file in QuickTime Player on Mac - Apple Support