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Upgrading to 60FPS and 120FPS with the Twixtor plugin

This is a frame rate interpolation technique using the Twixtor plugin working with multiple editing software. It algorithmically boosts the framerate by creating an intermediary frame in-between based on the difference between the two. The 30FPS footage is best converted to 60FPS for enhanced smooth movements and a more stable picture. If done properly it is so precise the eye can’t distinguish the difference compared to hardware 60FPS. It’s an intense computational operation that can require hours to interpolate 60 min of 5K video. 60FPS is the minimum standard for VR videos, this is widely acknowledged by viewers.

For some cameras like the ZCam K1 Pro and VuzeXR, the highest 5400x2700px resolution is obtained when shooting in 30FPS. Therefore it’s recommended that you interpolate 30FPS footage up to 60FPS. 

Only double the rate instead of a fixed 60FPS setting as the camera usually produces 29.97FPS footage, thus it won’t be an exact match of 60, but 59.94. 

For even better quality first interpolate each camera fish eye before you edit or stitch. Though the process gets lengthy there will be quality gains with fewer distortions.

Make sure to enable “Use GPU” plugin setup if available.

The best performance is seen when video is interpolated by the factor of two. 60FPS videos can be interpolated to 120 FPS to match the refresh rate of Valve Index and 90FPS for HP Reverb G2, Oculus Quest 2, Rift, HTC Vive. When 60FPS video is watched on 120Hz then the same frame is rendered twice. If the video is interpolated to 120FPS the 120Hz screen benefits a lot. 

Be sure not to simply double the frames of a video file, as this doesn’t benefit video quality while at the same time increasing the file size.

On DeoVR we use FFMPEG to interpolate vast amounts of videos. 

How To Use

  1. Import a video file. Drag and drop it into the plugin

  1. Change the FPS in ‘Sequence > Sequence Settings’ to 59.94 fps

  1. Unlink audio/video

  1. Go to Speed / Duration and change the speed parameter to 200%

  1. Copy Fast Track

  1. Combine the two video files in Nest

  1. Apply the RE:Vision plug-in Twixtor on the resulting Nest

  1. Select the Twixtor settings for interpolation. Make sure the Main speed is set to 50%

  1. Export settings. These settings are for interpolating RAW files with the Zcam K1pro 180vr camera. In the case of interpolation of an already finished project, you can set the bitrate value you need. Important! The video must be NOT VR. You DO NOT need to check the ’Video is VR’ box.

 
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