What is Frame Rate?

Frame rate defines the temporal resolution of a video. A 30 fps stream shows 30 distinct pictures every second. A 60 fps stream shows 60. The human eye perceives motion as smoother when more frames are available to fill the gaps between positions.

In streaming, the encoder samples the source video at a specific rate. If the source is 60 fps but the encoder outputs 30 fps, it drops half the frames. This can make fast movement look choppy or "judder." Conversely, upscaling a 30 fps source to 60 fps via frame interpolation adds artificial frames. This often looks unnatural and increases file size without adding real detail.

Frame rate interacts directly with bitrate. A 60 fps video contains twice as much motion data as a 30 fps video at the same resolution. To maintain the same visual quality, a 60 fps stream typically needs a higher bitrate. This increases bandwidth costs for both the server and the viewer.

• 24 fps: Common in cinema. Has a "filmic" look.
• 30 fps: Standard for TV and most VOD.
• 60 fps: Standard for sports and high-action gaming.

Choosing the wrong frame rate creates visible quality issues that drive churn. Sports fans expect 60 fps. If a tennis match or football game plays at 30 fps, the ball and players look blurry or stutter during fast plays. Viewers notice this immediately. They may blame your platform for poor quality, even if the issue is just a low fps setting.

For VOD content like interviews or documentaries, 30 fps is sufficient. Using 60 fps here wastes bandwidth and increases encoding time. It also raises the minimum bandwidth requirement for your viewers. If a viewer has a slow connection, a high-fps stream may buffer more often than a lower-fps stream of the same visual quality.

Operators must match the frame rate to the content type. Sports leagues need 60 fps to retain viewers. General entertainment can stick to 30 fps to save costs. Consistency is key. Mixing frame rates within a single playlist or channel can cause playback glitches on some devices. Define your fps standards per content category and enforce them during ingest.

• Forcing 60 fps on static content: This doubles the file size and processing load without improving the viewing experience for talk shows or news.
• Ignoring source material: Encoding a 24 fps movie at 30 fps causes judder. Match the output fps to the source or use proper conversion settings.
• Underestimating bandwidth impact: A 60 fps 1080p stream requires significantly more bitrate than a 30 fps stream. Make sure your CDN and viewer devices can handle the load.
• Inconsistent settings across channels: If one channel uses 30 fps and another uses 60 fps, make sure your player handles the switch smoothly. Some older devices struggle with dynamic fps changes.