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Frame Rates Explained
Frame rate is one of the most fundamental properties of any video file, yet it is also one of the most commonly misunderstood. Choosing the wrong frame rate rarely produces an obvious error; instead, it creates subtle problems that surface later: judder in a final export, audio that drifts out of sync, footage that looks inexplicably cheap, or slow-motion shots that are not as smooth as expected.
Understanding frame rates is not about memorising numbers. It is about understanding why each standard exists, what it was designed for, and what happens when you deviate from it.
What frame rate means
A video is a sequence of still images displayed in rapid succession. Frame rate, measured in frames per second (fps), is simply how many of those images appear each second. At sufficiently high frame rates, the human visual system perceives continuous motion rather than a series of individual pictures.
Higher frame rates produce smoother motion. Lower frame rates produce more visible motion blur between frames, which the brain interprets differently depending on context. The creative and technical implications of this are significant, and they explain why multiple frame rate standards coexist rather than the world converging on one number.
Frame rate also has a direct relationship with file size and storage. All else being equal (same resolution, same codec, same bitrate per frame), doubling the frame rate roughly doubles the file size. A minute of 4K footage at 60 fps is approximately twice the size of a minute at 30 fps. This relationship matters when planning storage requirements and when choosing export settings.
The standard frame rates and their origins
The major frame rate standards in use today each emerged from specific technical constraints and have persisted because of the creative qualities they produce and the infrastructure built around them.
24 fps: the cinema standard
24 frames per second became the standard for motion picture film in the late 1920s, when the film industry was transitioning to synchronised sound. Silent films had been shot at various speeds, typically between 16 and 26 fps, with projection speed varying by venue. The introduction of optical sound-on-film recording required a consistent speed, and 24 fps was settled on as a compromise: fast enough for acceptably smooth motion with the natural motion blur of a film camera's rotating shutter, and slow enough to conserve film stock, which was expensive.
Nearly a century later, 24 fps remains the global standard for theatrical cinema. Its persistence is not merely inertia. The slight motion blur and cadence of 24 fps is deeply associated with the "cinematic" look. Audiences who have watched films their entire lives have been trained to associate 24 fps with storytelling, drama, and artistic intent. This is a cultural perception, not a physiological one, but it is remarkably durable.
When shooting for cinema or for any project that aims for a cinematic feel, 24 fps is the standard starting point. Virtually all narrative films, many television dramas, and a large proportion of independent and short-form narrative content are shot at 24 fps.
25 fps: the PAL television standard
When television was developed in Europe, engineers needed to synchronise the scanning rate of cathode ray tubes with the local electrical grid frequency to avoid interference patterns. In most of Europe, the UK, Australia, and much of Asia and Africa, the mains electricity frequency is 50 Hz. The PAL and SECAM television systems were designed around this, using an interlaced scanning rate of 50 fields per second, which equates to 25 complete frames per second.
25 fps is visually very close to 24 fps. The difference of one frame per second is barely perceptible in motion quality. Content produced for PAL regions, including broadcast television, commercials, and corporate video, is typically shot and delivered at 25 fps.
For projects with a purely digital distribution path (web, streaming), the distinction between 24 and 25 fps is less critical than it was in the broadcast era. But if your deliverables include any European or PAL-region broadcast, 25 fps is typically required.
29.97 and 30 fps: the NTSC television standard
In North America and Japan, the mains electricity frequency is 60 Hz, and the NTSC television system was built around it. Originally, NTSC black-and-white television ran at exactly 30 fps (60 interlaced fields per second). When colour was introduced in the 1950s, a slight speed reduction was needed to accommodate the colour subcarrier signal without interfering with the audio carrier. The frame rate was adjusted from 30 to 29.97 fps, a reduction of 0.1 percent.
This seemingly trivial difference created a long-running complication: drop-frame timecode. At 29.97 fps, timecode that counts every frame ("non-drop-frame") drifts slightly relative to real-time clock. Over an hour, the discrepancy is about 3.6 seconds. Drop-frame timecode compensates by skipping frame numbers at specific intervals (frames 0 and 1 at the start of each minute, except every tenth minute). No frames are dropped from the video; only the numbering changes. The result is that drop-frame timecode accurately tracks wall-clock time, which matters for broadcast where programmes must fit precise time slots.
In practice, "30 fps" in North American production almost always means 29.97 fps. True 30.00 fps exists but is uncommon. Most NLEs and cameras default to 29.97 when "30" is selected, but it is worth verifying, because a mismatch between 29.97 and 30.00 in a project can cause subtle audio sync drift over long timelines.
48 fps: a cinema experiment
48 fps received significant attention when Peter Jackson used it for The Hobbit trilogy (2012 to 2014). The intent was to reduce the motion blur and strobing artefacts visible in fast-panning shots at 24 fps, particularly in 3D projection.
Reception was mixed. Many viewers found the increased clarity unsettling in a narrative context. Action was smoother, but the image had an immediacy that some described as resembling television or live theatre rather than cinema. The reduced motion blur revealed details, set textures, makeup edges, and prosthetics, that 24 fps' natural softness would have concealed.
48 fps has not been widely adopted for theatrical cinema since. It remains an option for specific creative choices, particularly in 3D and immersive formats, but 24 fps continues to dominate narrative filmmaking.
60 fps: sports, gaming, and smooth motion
60 fps (or, more precisely, 59.94 fps in NTSC-derived systems) is standard for sports broadcasting, live events, and video gaming. The higher frame rate captures fast motion with less blur and fewer artefacts than 24 or 30 fps, making it easier to follow rapid movement: a ball in flight, a racing car, a player's footwork.
In gaming, 60 fps is considered the baseline for responsive, smooth gameplay. Many competitive gamers target 120 fps or higher, but 60 fps is the threshold below which most players notice a degradation in smoothness and input responsiveness.
On YouTube and other web platforms, 60 fps content is common for gaming footage, tutorials, screen recordings, and vlogs. The platform handles it well, and viewers accustomed to 60 fps often notice the difference when watching 30 fps content of the same type.
60 fps is also used as a capture rate for slow motion when the output is 30 fps. Footage shot at 60 fps and played back at 30 fps produces 2x slow motion, a gentle slowing effect useful for interviews, product shots, and b-roll.
120 fps and above: slow motion and specialty capture
Frame rates of 120 fps and above are primarily used for slow-motion capture. 120 fps played back at 24 fps yields 5x slow motion. 240 fps at 24 fps gives 10x. Some cameras can capture at 1,000 fps or higher for extreme slow-motion effects.
At these rates, the storage implications are substantial. A camera shooting 4K at 120 fps produces roughly five times the data of the same camera at 24 fps. Storage planning, appropriate file formats, and a clear media management strategy are essential for high-frame-rate shoots.
120 fps is also used for display in gaming (120 Hz monitors) and in newer television standards (some sports streaming and premium content). Consumer adoption of high-frame-rate display is growing, but content production at these rates remains niche outside of gaming and slow motion.
The soap opera effect
One of the most commonly discussed perceptual phenomena related to frame rate is the so-called "soap opera effect." When viewers accustomed to 24 fps cinema see content at 48, 60, or higher frame rates, they often describe it as looking "cheap," "like a soap opera," or "like video."
This reaction has a real perceptual basis, though it is culturally conditioned rather than inherent. For decades, high-budget narrative content (films) was shown at 24 fps, while lower-budget content (daytime television, soap operas, news, home video) was shot on video at higher frame rates (50i or 60i). Audiences learned to associate low frame rates with prestige and high frame rates with everyday or inexpensive production. That association is powerful. Even technically superior motion rendering at 48 or 60 fps can feel "wrong" to viewers expecting cinematic cadence.
Many modern televisions ship with motion interpolation enabled by default, a feature that analyses adjacent frames and generates intermediate frames to simulate a higher frame rate. This is what produces the soap opera effect on home displays. It is applied to 24 fps content that was never intended to be viewed at higher rates, and it strips away the motion characteristics that the filmmaker chose. Most filmmakers and colourists recommend disabling motion interpolation for any content that was shot at 24 fps.
Shooting for slow motion
Slow motion is achieved by capturing at a higher frame rate than the playback rate. The mathematics are simple: divide the capture rate by the playback rate to determine the slow-motion factor.
60 fps captured, played back at 24 fps, yields 2.5x slow motion. 120 fps at 24 fps yields 5x. 240 fps at 24 fps yields 10x. At 30 fps playback, the factors shift: 60 fps gives 2x, 120 fps gives 4x, and so on.
The key creative decision is how much you want to slow the action. Subtle slow motion (1.5 to 2.5x) adds a gentle emphasis to a moment without calling attention to itself. It is useful for b-roll, establishing shots, and emotional beats. Moderate slow motion (4 to 5x) is noticeable and dramatic, suitable for action, sports, and music videos. Extreme slow motion (10x and beyond) reveals details invisible to the naked eye and is a deliberate visual effect.
When planning a shoot with slow-motion requirements, set the camera to the highest frame rate you need for your slowest shot. Remember that higher frame rates demand more light (shorter exposure per frame) and generate much larger files. Not every shot needs to be captured at the maximum rate. Shoot at your delivery frame rate for standard coverage and switch to higher rates only for shots intended to be slowed down.
A proxy workflow becomes particularly valuable when working with high-frame-rate footage, since the volume of data generated by 120 fps or 240 fps capture can overwhelm editing hardware.
Mixing frame rates and why it causes problems
One of the most common technical mistakes in video production is mixing frame rates within a project without understanding the consequences.
When you place a 24 fps clip on a 30 fps timeline, the NLE must reconcile the difference. It needs to display 30 frames per second, but the source only provides 24. The NLE handles this by duplicating or blending frames in a process called pulldown or frame interpolation. The result is often a subtle but visible judder, a periodic hitch in motion that does not look quite right.
The reverse (30 fps footage on a 24 fps timeline) has its own problems. Frames must be dropped or blended to reduce the count, which can produce a jerky or uneven motion quality.
Mixing 24 fps and 25 fps is common in international co-productions, and the 4 percent speed difference is sometimes handled by simply playing the footage at the other rate, which shifts audio pitch slightly. Modern NLEs can compensate for this, but it requires awareness of the issue.
The practical advice is to set your project timeline to match your primary footage frame rate, and to shoot all footage at that rate whenever possible. If you must include footage at a different frame rate (for example, 60 fps slow-motion shots in a 24 fps project), handle the speed change explicitly: interpret the 60 fps clip as 24 fps in your NLE to produce smooth slow motion, rather than letting the NLE perform automatic frame rate conversion.
Practical recommendations by use case
Different types of content have established frame rate conventions that are worth following unless you have a specific creative reason to deviate.
Narrative film and cinematic content uses 24 fps globally. This is the strongest convention in the list and the one most likely to look wrong if changed.
Broadcast television uses 25 fps in PAL regions and 29.97 fps in NTSC regions. If your deliverables go to broadcast, match the regional standard.
Web and streaming content can use 24, 25, or 30 fps depending on the desired aesthetic and the target audience's region. 24 fps reads as cinematic; 30 fps reads as clean and immediate. Either is acceptable on platforms like YouTube, Vimeo, and social media.
Sports and live events are typically captured at 50 fps (PAL) or 59.94 fps (NTSC) to render fast motion clearly.
Gaming content and screen recordings are best served at 60 fps, which matches the display rate of most gaming monitors and provides smooth motion for the quick visual changes common in gameplay.
Slow-motion capture requires planning based on the desired slow-motion factor and the project's playback rate, as discussed above.
For content creators producing across multiple formats, it is useful to standardise on one frame rate for a given project and convert only when a specific deliverable requires a different rate.
Variable frame rate and phone footage
Modern smartphones present a particular complication: variable frame rate (VFR) recording. Rather than capturing at a fixed frame rate, many phones adjust the frame rate dynamically to save battery and storage, dropping to lower rates during static scenes and increasing during motion.
VFR causes problems in NLEs because most editing software expects a constant frame rate. Importing VFR footage can result in audio gradually drifting out of sync with video, a problem that worsens over longer clips. The desync is often small enough to go unnoticed during rough editing but becomes obvious in final review.
The standard solution is to transcode VFR footage to a constant frame rate before editing. Tools like Handbrake or Shutter Encoder can convert VFR to CFR (constant frame rate) without significant quality loss. Some NLEs handle VFR better than others: DaVinci Resolve and Premiere Pro have improved their VFR handling in recent versions, but transcoding remains the most reliable approach.
If you plan to include phone footage in a professional project, test it early. Import a clip, scrub through it, and check for audio sync issues. This five-minute test can save hours of troubleshooting later.
When working with footage from multiple sources, including phones, cameras, and screen recordings, a cloud-based workspace with transcription and search can help you identify and organise clips by source, making it easier to flag VFR footage before it reaches the timeline. Fabric's video management tools let you preview and annotate footage from any device without downloading it, which is useful when reviewing material shot on phones across a distributed team.
Frame rate and storage
The relationship between frame rate and storage is linear and predictable. At a given resolution and codec, doubling the frame rate doubles the data rate and roughly doubles the file size for a given duration of footage.
This matters most at higher resolutions. The difference between 24 fps and 60 fps at 1080p is meaningful but manageable. At 4K, the same increase adds hundreds of gigabytes to a typical shoot. At 8K, even moderate frame rate increases have major storage implications.
When planning a production, consider frame rate alongside resolution and codec as part of your storage calculation. A project shooting 4K at 24 fps in ProRes 422 HQ needs roughly 800 MB per minute of footage. The same project at 60 fps needs roughly 2 GB per minute. Over a 10-hour shoot, that is the difference between approximately 480 GB and 1.2 TB for camera originals alone, before accounting for proxies, renders, and exports.
Cloud storage and streaming-based platforms can ease the pressure by keeping archived footage accessible without occupying local drive space, but the initial capture still needs somewhere to land, and planning your storage capacity around your chosen frame rate is part of pre-production.
Frequently asked questions
What frame rate should I shoot in?
It depends on the project type and delivery format. For cinematic and narrative work, 24 fps is standard. For broadcast, match your region's standard (25 fps for PAL, 29.97 fps for NTSC). For web content, 24 or 30 fps are both common. For sports or gaming, 60 fps. Choose one frame rate for your project and shoot consistently at that rate, switching to higher rates only for shots intended as slow motion.
What is the difference between 29.97 fps and 30 fps?
29.97 fps is the NTSC standard, derived from a 0.1 percent speed reduction applied when colour was added to the television system in the 1950s. True 30.00 fps is rarely used in professional production. Most cameras and NLEs that offer "30 fps" default to 29.97. The difference is small but can cause audio sync drift over long timelines if a project mixes the two. Always verify which rate your camera and timeline are using.
Why does high frame rate footage look like a soap opera?
The association is cultural. For decades, high-budget cinema was shown at 24 fps, while lower-budget television and home video used higher frame rates. Audiences learned to associate the motion characteristics of 24 fps with prestige and storytelling. Higher frame rates, while producing smoother and technically more accurate motion, lack the motion blur and cadence that viewers associate with cinema. The perception is reinforced by television motion interpolation features that convert 24 fps content to higher rates.
How do I shoot slow motion?
Capture at a higher frame rate than your project's playback rate. For 2.5x slow motion in a 24 fps project, shoot at 60 fps. For 5x, shoot at 120 fps. In your NLE, interpret the high-frame-rate clip at your project frame rate, or place it on the timeline and apply a speed change. Higher frame rates require more light and generate larger files, so plan accordingly.
Does higher frame rate mean better video?
Not necessarily. Higher frame rates produce smoother motion and less blur, which is beneficial for sports, gaming, and action footage. But for narrative and cinematic content, the reduced motion blur of higher frame rates can work against the intended aesthetic. Frame rate is a creative choice, not a quality ladder. 24 fps is not inferior to 60 fps; it is a different look suited to different purposes.
What is drop-frame timecode?
Drop-frame timecode is a numbering system used at 29.97 fps to keep timecode in sync with real-time clock. It skips frame numbers 0 and 1 at the start of each minute, except every tenth minute. No video frames are dropped; only the counting labels change. This prevents the 3.6-second-per-hour drift that would occur if frames were counted sequentially at 29.97 fps.
Can I convert frame rates in post-production?
Yes, but with caveats. Converting between closely related rates (24 to 25, or 29.97 to 30) often produces acceptable results. Converting between more distant rates (24 to 60, or 60 to 24) requires frame duplication, frame blending, or optical flow interpolation, each of which introduces artefacts. Optical flow produces the smoothest results but can create visible warping on complex motion. The best approach is to shoot at your intended delivery frame rate whenever possible.
Why does my phone footage cause audio sync issues in my NLE?
Most phones record using variable frame rate (VFR), adjusting the actual capture rate dynamically rather than maintaining a constant rate. NLEs expect constant frame rate (CFR) media, and VFR footage can cause progressive audio drift. The standard fix is to transcode VFR footage to CFR before importing it into your editing project. Handbrake, Shutter Encoder, and similar tools can do this reliably.
What frame rate does YouTube recommend?
YouTube accepts and displays content at 24, 25, 30, 48, 50, and 60 fps. For most content, 24 or 30 fps is standard. For gaming and fast-motion content, 60 fps is recommended. YouTube re-encodes all uploads, so the source frame rate is preserved in the player. There is no quality benefit to uploading at a higher frame rate than the source was captured at.
Does frame rate affect file size?
Yes, proportionally. Doubling the frame rate at the same resolution and codec settings roughly doubles the file size and data rate. This is because twice as many frames need to be stored per second of video. It is an important factor when estimating storage needs and when choosing between frame rates for projects with storage or bandwidth constraints.