Last Updated 5 hours ago
Filmmaking Dictionary: Number 3 / 30 fps
Definition
30 fps means 30 frames per second. At true 30.000 fps, thirty complete images represent each second of progressive video. The rate is distinct from the fractional 29.97 fps convention, even when a camera or conversation rounds both to ’30’.
Use the exact rate when configuring cameras, timelines, timecode and delivery. A small numerical difference can become a noticeable timing mismatch across a long recording.
Motion and Shutter
Compared with 24 fps, 30 fps provides more temporal samples each second. That can change the appearance of movement, but perceived smoothness also depends on shutter time, subject speed, camera movement and the display.
At true 30 fps, a 180-degree shutter gives a 1/60-second exposure. Choosing a shorter exposure makes individual frames sharper during movement, while choosing a longer exposure increases blur. Neither change alters the number of frames recorded per second.
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30p Is Not 60i
A progressive 30p image contains complete frames. An interlaced signal commonly described as 60i contains fields, with two fields forming a frame pair. Those fields may represent different moments. Counting them as sixty complete progressive frames gives the wrong impression of the source.
The distinction matters when deinterlacing, making slow motion or converting footage. Read both the rate and scanning method rather than relying on a single number in a filename.
Practical Example
A creator records a demonstration at true 30 fps and wants to combine it with a camera set to 29.97. A short comparison may look acceptable, but the sources do not share exactly the same timing. The editor needs an intentional conversion or interpretation plan, especially if both cameras cover the same continuous event.
For slow motion, material recorded at 60.000 fps and played at 30.000 while retaining every frame runs at half speed. That clean relationship is different from simply exporting a normal-speed 30 fps clip with a higher frame-rate label.
Checks Before Shooting
- Verify whether the camera’s ’30p’ label means 30.000 or 29.97.
- Confirm the delivery rate before recording a long project.
- Test lighting and screens at the selected shutter setting.
- Keep off-speed footage clearly identified for editorial.
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Frequently Asked Questions
Is 30 fps always smoother than 24?
It provides more frames per second, but the visible result depends on the whole capture and display chain.
Does 30 fps mean a 1/30-second shutter?
No. Frame rate and exposure time are separate controls.
Related Terms
Browse all terms starting with 3 or return to the filmmaking dictionary.