How to Convert MKV Files to MP4

By Marshal M. Rosenthal

The Matroska Video (MKV) video file format is used both online and on Windows-based computers, but it is not recognized by Macintosh computers. Converting a MKV file to the MP4 format provides compatibility for Macs and for use on mobile devices, such as iPods and cell phones. The QuickTime Pro program provides the best conversion experience because it works in the same fashion on both Macs and Windows-based computers, and it also enables fine-tuning of the final MP4 file. Converting an MKV file to the MP4 file format will not decrease the video quality of the original MKV file.

Step 1

Download and install the Mac or Windows version of the free QuickTime Player program from the Apple website to the computer's hard drive (see link in Resources). Restart the Windows-based computer after the installation has been completed.

Step 2

Run the QuickTime Player program. Go to "QuickTime" if on a Mac or "File" if on a Windows-based computer and select "Registration." Enter your name in the "Registered To" column at the top of the window that has opened.

Step 3

Return to the Apple QuickTime website and click on the "Upgrade Now" button near the middle of the web page. Purchase the QuickTime Pro registration code. Enter the QuickTime Pro registration code into the "Registration" column of the QuickTime Player window that is still open. Close the window.

Step 4

Run QuickTime Player again, which has transformed into QuickTime Pro now that the registration code was entered into it. Go to "File" and select "Open File" from the drop-down menu. Navigate to the MKV file on the computer's hard drive. Click once on the MKV file with the mouse. Click "Open" to load the MKV file into QuickTime Pro.

Step 5

Go to "File" and select "Export" from the drop-down menu. Select “Movie to MPEG-4” from the drop-down menu next to the “Export” tab. Leave “Most Recent Settings” that is next to the “Use” tab alone.

Step 6

Select the “Options” button and select the “Audio” tab in the window that appears. Select “Best” from the “Encoding Quality” drop-down menu. Click “OK” to close the window.

Step 7

Name the MP4 file. Click the “Save” button at the lower-right corner to save the MP4 file that was converted from the WMA file to the computer’s hard drive.

Tips & Warnings

  • Convert MKV files to MP4 one at a time to ensure that the conversion is done correctly.
  • Running other video conversion programs at the same time as QuickTime Pro can cause disk errors to occur in the final files.