Open your video editing program and load your project. Drag the clips you want to remove flicker from into your timeline, which is on the bottom half of the program. Arrange them however you like.
Select "File" then "Export" to export your file. Select the file type you want to export your file as and give it a name.
Select "Settings" from the export window. This gives you a list of settings for the export. Click "Size" or "Compression Settings." This box contains an option to deinterlace your footage. Check the box to deinterlace exported footage.
Choose which type of deinterlacing you want. "Blend" or "Combine Fields" blends the two frames that the camera recorded. This is the most common type of deinterlacing and often results in a smooth effect. "Discard" removes one of every two of these frames. This works if there is not a lot of motion in the image. "Progressive Scan" plays the video back at double the frame rate and includes all of the frames. If the video is 25 feet per second, for example, it plays at 50 feet per second so that it can incorporate each frame. This is useful if the shot contains a lot of motion.
Select "OK" then "Export" when you are finished with your settings. Exporting usually takes a little less time than the duration of the exported video. When it is finished, the video flickers less.