If you want to play FLV videos in QuickTime, you need to convert the FLV YouTube videos to QuickTime MOV format first. To convert FLV to QuickTime MOV on Mac, you need a powerful yet easy to use FLV to MOV Video Converter for Mac.

Download it for free here: Mac Video converter

1. Load FLV videos to the Video Converter for Mac

Launch the Mac FLV to MOV Converter, drag and drop the FLV video files to the software or click "File -> Add Video file" menu to load FLV files.



2. Select "Video Format -> MOV" as output format

Select MOV format from the output format list,



3. Start FLV to MOV conversion on Mac.

Click "Convert" button let this FLV to MOV Converter for Mac to do the conversion for you! When the conversion is done, you can play output MOV video files in QuickTime.