What Frame Rates Does a DCP Support?
The current SMPTE DCP specification supports six whole-number frame rates: 24, 25, 30, 48, 50 and 60 frames per second. The older Interop DCP standard only supports 24fps and 48fps.
24fps is the universal safe choice — it works on every cinema server in the world without exception. 25fps works on all modern servers and is common for European productions with PAL origins. 30fps, 48fps, 50fps and 60fps all work on modern SMPTE servers.
What About 23.976 and 29.97?
These frame rates do not exist in cinema. 23.976 originated as a television compromise to make 24fps film content compatible with the NTSC broadcast standard. Nearly every camera that claims to shoot "24fps" is actually shooting 23.976. Both rates are deeply embedded in video production — and neither is acceptable in a DCP. If your film is at either rate, it needs to be conformed to a whole-number rate before encoding.
For 23.976 to 24fps, the total duration of a 90-minute film changes by approximately 10 seconds. The change is imperceptible. For 29.97 to 24fps, the process is more complex — it requires genuine frame interpolation and fast motion can show artefacting. If you have any control over specification before shooting, there is no good reason to shoot at 29.97fps if cinema is the destination.
Audio and Two-Pops
When the picture is conformed, the duration of the film changes slightly. Audio must be adjusted to match — otherwise sync will drift over the course of the film. This is why two-pops and tail-pops are essential. A two-pop is a single frame of audio tone placed exactly two seconds before the first frame of picture. A tail-pop is placed at the end. After conforming, we verify that both pops are in the correct position. Without them, we are relying on visual sync checks alone.
Always ask your editor or dubbing mixer to include a two-pop at the head and a tail-pop at the end when preparing files for DCP delivery. They cost nothing and are the only reliable way to verify sync after any timing operation.
Academy Awards and IMAX
The Academy of Motion Picture Arts and Sciences requires films to be exhibited in a 24fps progressive scan format for qualifying theatrical runs. A 25fps or 30fps DCP will not satisfy Academy requirements. If Oscar eligibility is part of your ambitions, 24fps is non-negotiable. IMAX DCPs are similarly understood to be limited to 24fps.
High Frame Rate DCPs
48fps, 50fps and 60fps DCPs are genuinely useful for content that benefits from fluid motion — live performance, opera, ballet, filmed theatre, sports. If you have content shot at a high frame rate and want to preserve that fluidity in cinema, a high frame rate DCP is a viable option and is supported by the majority of modern installed cinema equipment.
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