increase the speed of my video's by 1.25x or 1.50x on Windows

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I'd like to increase the speed of my video's by 1.25x or 1.50x, like can be done on YouTube.  Unlike YouTube, however, speeding up in Camtasia 9 causes audio to speed up (chimpmonking the audio).  Last entry I saw here was 6 years old.  Any way, I'm on Windows version and wonder if this is possible.  If YouTube can speed up w/o chipmunking audio, we can't Camtasia 9?
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Posted 2 years ago

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kayakman, Champion

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use clip speed adjustment in your project; export the project to free Audacity and adjust the pitch accordingly; replace original audio with the adjusted audio clip

How To Alter Clip Duration While Maintaining Acceptable Narration Pitch
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Brian Nystrom

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Another simple way to do it is to lock the audio track before making your clip speed adjustments. The audio will remain unaffected by the speed change. 
Photo of kevinohlson


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Depending on the project, shortening (speeding up) the video while the audio remains the same may mean that the audio and video are no longer sync'd. Sometimes adding freeze frames throughout can help.