Step 5: At the end, click on the Start button. Step 4: Next, choose the input Codec, check or edit specified profile settings. Step 3: Next, give a name for the converted file in the Convert window. Step 2: Select the MP4 file that needs to be repaired, and click on Convert or Save button. Step 1: Open VLC Player, select Media, and choose Convert or Save. Method 1: Repair Corrupt MP4 Files with VLC Here are 2 easy ways to repair a corrupt MP4 video. In case, the corrupted or damaged MP4 video file is important for you then don’t worry. Thus, it is a well-cleared fact about MP4 videos that the large file sizes of MP4 format are highly prone to corruption. In order to bring high-quality videos, obviously, the size of these MP4 video files should be large in comparison with rest of video file formats. MP4 video file format is well-known for its ability to deliver high precision video and audio output.