Flux is a function of GoPro Studio that allows you to apply ultra-smooth slow motion to your footage regardless of what frame rate your footage was recorded in.
To understand how Flux works we need to first understand how slow motion works. If you record some fast pace footage at 60fps but then replayed it in GoPro Studio at 30fps you will end with a crisp slow motion sequence that is being replayed at half its original speed. However, if you recorded some great footage in 30fps and then replayed at 15fps you will still have footage that had been slowed down by 50% but the footage will appear very choppy. This is because you need a minimum of 30fps for good clean footage.
To get around this you could always record using a very high FPS. How this would limit the quality and exposure settings you can use with your Camera. To get around this quality to frame rate trade off the Flux function creates addition frames to enable smooth play back without any loss of quality.
Users of Adobe Premier or Final Cut Pro may already be familiar with a plugin called Twixtor. Flux works the same way as this plugin without the $300 price tag.
To apply Flux, simply select the Video Controls while in the Edit tab. Then move the Speed control bar to the play back speed you desire. Whenever you move this control bar the Enable Flux tab will be checked automatically.
Flux can be applied to any play back speed, but its effects really become noticeable when you slow your footage right down to less the 10%.
Flux Draw Backs
For amateur video editors Flux may seem like a dream come true. However, the Flux function has two major flaws. First of all, it can be an extremely lengthy process – after all, the GoPro studio needs to create the additional frames to insert between the ones you actually captured! The processing power required to do this can be quite time-consuming, and for this reason I recommend that you only apply Flux to very short sections of your footage.
The second drawback is that it is difficult to predict what the end product will look like using Flux.
In order for Flux to create additional frames, it needs to be able to differentiate between the subject moving and the background in your footage. Therefore one of the biggest issues with using Flux is the background in your footage. If you apply Flux to footage where there is a moving object in front of a complex background. You will likely notice a weird warping effect around the object. Therefore when recording something that you may want to slow down try to record in to a clear and plain background.
Other tips for avoiding warping and distortion from Flux include:
- Not filming too close to moving object
- Filming with a simple and consistent background such as clear sky or still water
- Filming with a high FPS rate. Although Flux does artificially increase the FPS rate, the fewer additional frames you require, the less likely it is that the image will be distorted. For example if you want to slow a video down to 5% and you filmed at 30FPS, the software would need to create 20 frames for every 1 frame of footage. However, if you shoot at 120FPS only 5 would need to be created per frame.
Turn 30fps to 60fps
If you like the smooth look of 60fps but have only recorded your footage at 30fps you can use Flux to artificially create the extra frames.
To do this, convert the section of footage that you would like to change in GoPro Studio. When in the Edit screen use the Video Controls to slow the footage down by 50% and ensure that the Enable Flux box is ticked. Then click the Export Tab to render and save the video.
Once the video is saved open it again in GoPro Studio, once again convert the video and open the Edit window. Once in the Edit Window use the video controls to speed the video up by 200%. Then click the Export Tab to render and save the video.
This can be a long process so I suggest only using it on short clips.
The most important things to do to ensure that your slow motion videos turn out in the way you envision are:
- Record your footage at the highest fps available within the quality range you require
- If possible, position the camera so that the moving object is going towards or away from the camera with a clear, consistent background.
- If you need to slow the footage down while editing, apply Flux but limit this to short sections of your footage or prepare for a lengthy wait!
For more tips on how to apply slow motion in GoPro Studio check out How to use Slow Motion on your GoPro