To set any of these, go to terminal and enter in the code for whichever preference you want to set. Remember, to reset the setting to its default value, just change the "1" at the end to a "0" (or vice versa).
Disable rounded corners
Never show titlebar/controller
Always show titlebar/controller
Never show the titlebar
Autoplay movies on open
Automatically show subtitles and closed captioning on open
Keep playing full-screen even when you command-tab out of QT
Allow simultaneous recordings
Unknown
I don't know exactly what these do, or they don't seem to have an effect when I enable them but here you go:
Disable rounded corners
Code:
defaults write com.apple.QuickTimePlayerX MGCinematicWindowDebugForceNoRoundedCorners 1
Never show titlebar/controller
Code:
defaults write com.apple.QuickTimePlayerX MGUIVisibilityNeverAutoshow 1
Always show titlebar/controller
Code:
defaults write com.apple.QuickTimePlayerX MGUIVisibilityNeverAutohide 1
Never show the titlebar
Code:
defaults write com.apple.QuickTimePlayerX MGCinematicWindowDebugForceNoTitlebar 1
Autoplay movies on open
Code:
defaults write com.apple.QuickTimePlayerX MGPlayMovieOnOpen 1
Automatically show subtitles and closed captioning on open
Code:
defaults write com.apple.QuickTimePlayerX MGEnableCCAndSubtitlesOnOpen 1
Keep playing full-screen even when you command-tab out of QT
Code:
defaults write com.apple.QuickTimePlayerX MGFullScreenExitOnAppSwitch 0
Allow simultaneous recordings
Code:
defaults write com.apple.QuickTimePlayerX MGAllowMultipleSimultaneousRecordings 1
Unknown
I don't know exactly what these do, or they don't seem to have an effect when I enable them but here you go:
Code:
defaults write com.apple.QuickTimePlayerX MGTimeIntervalBeforeShowingLoadingUI
defaults write com.apple.QuickTimePlayerX MGUseForkedDecoder
defaults write com.apple.QuickTimePlayerX MGEnableMediumQualityAudioRendering
defaults write com.apple.QuickTimePlayerX MGDisableQuickTimeX
defaults write com.apple.QuickTimePlayerX MGShowFrameworkVersions
defaults write com.apple.QuickTimePlayerX MGEnableWWDC2009KeynoteBehavior
defaults write com.apple.QuickTimePlayerX MGCinematicWindowUseWindowShapeForRoundedCorners
defaults write com.apple.QuickTimePlayerX MGCinematicWindowTitleAlwaysHasActiveAppearance
defaults write com.apple.QuickTimePlayerX MGTimelineDisableAudioTrackForVideoMovies
defaults write com.apple.QuickTimePlayerX MGTimelineShowSlientRangesWithModifierKey