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I found an old camcorder (MUSTEK DV4000) with old videos on it I'm trying to get them on my phone to send to my family but it keeps becoming slow motion. I turned them from .ASF files to Mp4 files and it still becomes slow motion.
iMac 21.5″, macOS 14.5
newer macOS like Ventura - Sequoia QuickTime Player plays middle part of high frame rate movies (seems to be ≈85 fps or more) in slow-motion.
You can override that losslessly by adding FullFrameRatePlaybackIntent=1 tag to the movie with exiftool:
exiftool -m -P -overwrite_original -api LargeFileSupport=1 -ext mov -Keys:FullFrameRatePlaybackIntent=1 movie.mov
Back to the default with either:
exiftool -m -P -overwrite_original -api LargeFileSupport=1 -ext mov -Keys:FullFrameRatePlaybackIntent=0 movie.mov
Or remove that tag:
exiftool -m -P -overwrite_original -api LargeFileSupport=1 -ext mov -Keys:FullFrameRatePlaybackIntent= movie.mov
High frame rate playback option: iOS/iPadOS 18 introduced QuickTime FullFrameRatePlaybackIntent tag:
"key that represents whether this movie should play at full frame rate
Some apps play movies recorded at frame rates of 120fps or higher in slow motion. If your app records high-frame-rate movies, you can add this movie-level metadata to indicate whether the movie intends to play at the full frame rate (1) or at a slow motion rate (0). Apps that play movies may use this metadata, when present, to guide their behavior."
quickTimeMetadataKeyFullFrameRatePlaybackIntent | Apple Developer Documentation
BTW it seems currently Windows might be incompatible. If that tag is present, Windows might fail to display thumbnails and most metadata items in its Details panel (Media created, resolution, frame rate, audio details etc). Until that incompatibility is fixed in Windows, a workaround is to remove that tag with the command above.
I figured it out. Just converted the videos to 30fps.
How do I disable the lower slide under the normal slider in Quicktime player?