The frame rate, often referred to as FPS (frames per second), plays a decisive role in the quality of video content. It determines how smoothly the movements in your videos are perceived. Sometimes it may be necessary to convert the frame rate, for example if video content is to be adapted for different platforms or formats.
There are a variety of common frame rates, including 24, 25, 30, 50 and 60 FPS, the use of which often depends on regional standards and specific applications. Videos in the American NTSC format (29.97 and 59.94 FPS) can also pose a challenge if you want to convert a frame rate. In this blog post, we would like to give you an insight into which methods are available and how they work.
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Challenges with frame rate conversion
Converting the frame rate can be easy, but it can also cause various difficulties. Here are two examples:
- The first movie was recorded at 60 frames per second and is to be shortened to 30 frames per second. This is not difficult, because now every 2nd frame is simply deleted.
- A video that was recorded at 25 FPS is to be converted to 30 FPS. Where should the missing five frames come from?
A common problem is the so-called “judder”, a jerking of the image that occurs when frames are added or removed incorrectly. Frame blending, where frames are improperly mixed together, can also lead to unwanted artifacts. Technical challenges can also arise if, for example, the IT infrastructure is not stable enough for high frame rates.
Expert tip: A suitable KVM solution can make a significant contribution to the stability and therefore the quality of the conversion.
Best practices and solutions for frame rate conversion
If you are faced with the challenge of converting the frame rate, there are various methods that can provide an optimal solution. This is an overview of the most common methods for subsequently changing the FPS rate of a recording using a video editor:
Method 1: Frame dropping or duplication
This is the simplest method, in which frames are omitted (frame dropping) or duplicated (frame duplication) to adjust the frame rate. However, this method only makes sense if the frame rate only needs to be adjusted slightly (e.g. 50 FPS to 25 FPS or vice versa).
Method 2: Frame blending
With frame blending, several frames are blended so that a single new frame is created. This method can be useful when adjusting the frame rate for slow motion effects, but often produces a “ghost image” phenomenon at normal speeds.
Method 3: Frame interpolation
Frame interpolation is a process in which new frames are created by using the information from two adjacent frames. This can help to smooth out movements and reduce the “judder” effect. However, caution is advised as interpolation uses artificially created frames and can lead to unwanted image content if used incorrectly.
Method 4: Speed up/slow down video
If you want to convert frame rates, you can also simply speed up or slow down movies. A movie (24 FPS) with a length of 120 minutes that is shown on TV (convert to 25 FPS) can be sped up to replace the missing frame. However, the movie on TV ends after around 115 minutes and there may also be sound problems. The longer the movie lasts, the more the sound and picture are no longer lip-synchronized.
With all these methods, it is important to use suitable software such as a video frame rate converter for video editing that delivers high-quality results. In addition, you should always keep the target platform and format in mind when converting to ensure that the video is displayed correctly.
Expert Tip: Always test the converted video in its final form. Make sure that the frame rate conversion has worked as desired and check for any errors that may occur.
Conclusion and outlook
The correct conversion of frame rates is an essential component in video editing that significantly influences the quality and perception of your content. However, with the right methods and tools to change video FPS, as well as a good dose of expertise, many of the typical challenges can be overcome.
At G&D, we keep our finger on the pulse and closely monitor developments and trends in video editing and frame rate conversion. Our aim is always to provide innovative and practical solutions to the challenges our customers face.
Our KVM experts will be happy to provide you with further information and answer your questions. Simply contact us to find out more!
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