Frame Rate Converter

Knowledge Base

How to Use the Frame Rate Converter

The Frame Rate Converter calculates frame counts, durations, and playback speeds when changing between frame rates (24fps, 30fps, 60fps, etc.). Use this when converting between broadcast standards, slow-motion, or conforming timelines across different projects.

Common Frame Rates and Their Uses

• 24fps: Cinema standard. Used for theatrical releases and cinematic YouTube content.
• 25fps: PAL broadcast standard (Europe, Africa, Asia). Used for television in these regions.
• 29.97fps (30fps): NTSC broadcast standard (North America, Japan). Practically 30fps.
• 59.94fps (60fps): High frame rate for smooth motion and slow-motion playback.
• 23.976fps: Exact cinema standard, used instead of 24fps for broadcast compatibility.

Understanding Pulldown and Conversions

Converting from 24fps to 29.97fps requires 3:2 pulldown (repeating frames). Converting from 60fps down to 24fps removes frames or interpolates. These conversions affect motion smoothness and playback speed.

Practical Scenarios

Slow Motion: Record at 60fps, play back at 24fps for 2.5x slow-motion effect.
Conforming Timelines: Mix 24fps and 30fps clips in one project (requires pulldown conversion).
International Distribution: Convert cinema (24fps) to PAL (25fps) or NTSC (29.97fps) for broadcast.

FAQ

Q: Does higher frame rate always look better?
A: No. 24fps feels cinematic, 60fps feels hyper-real (video game-like). Choose for aesthetic intent.

Q: Should I record at 23.976 or 24fps?
A: For broadcast, 23.976 is standard. For cinema-only projects, 24fps is fine.

Worked examples: what changes when you conform between frame rates

The tool divides the target frame rate by the source frame rate. The result less one, as a percentage, is the speed change. The pitch change in semitones is 12 times the base-2 logarithm of the same ratio, and applies if the sound is carried along with the picture. The rating comes from a short chain of rules in the tool, and the table lists twelve pairings with the tool's own wording.

Two rules explain most of the ratings. A higher rate going to a lower one is read as slow motion, and it is rated Excellent slow motion from a factor of 2 upward. A lower rate going to a higher one has no frames to draw on, so the tool calls it complex and points to optical flow or blending. The 24 to 25 pairing has its own rating because it is the film to PAL conversion, which plays 4.17 per cent fast and lifts the pitch by 0.71 of a semitone.

A speed change of 100 per cent is an octave, 12 semitones, which is why 30 to 60 and 25 to 50 both show +12.00. The difference between 24 and 23.976 is a tenth of a per cent, below the point where the tool reports a pitch shift.

Vocabulary

Frame rate. How many images make up each second of video, written as fps. Cinema uses 24, European broadcast 25, and North American broadcast 29.97. The rate is fixed when you shoot, and changing it later always costs either running time or picture quality.

Conform. Changing footage from one frame rate to another. Done by playing frames at a different speed, which alters running time, or by generating new frames, which preserves timing but risks artefacts.

Pulldown. A method of fitting 24 fps material into a 29.97 fps broadcast stream by repeating fields in a repeating pattern. Preserves running time without changing pitch, at the cost of slightly uneven motion.

Semitone. One step of the twelve-note musical scale. A shift of one semitone is clearly audible on a voice, and a shift of twelve is a full octave, which is what halving playback speed produces.