This article tells you what to do if you are playing back a MOV video in QuickTime for Windows and the audio is ‘stuttering’ or distorted.
If you're using Windows Quicktime to play a .mov file and it stutters during playback, change your playback settings as follows:
Step 1. Open the Edit menu within Quicktime
Step 2. Select Quicktime preferences
Step 3. On the Audio tab (A), change 'Play Audio Using' from 'Direct Sound' to 'Windows Audio Session' (B)
Step 4. Click Apply and OK.
Then close Quicktime and re-open the video file.
The audio will now play smoothly.