Shoot at the frame rate of where the film will be shown. Use 25 fps for UK and European broadcast and online work, 23.976 for US television and most streaming drama, 24 for cinema, and 29.97 or 30 for US broadcast video. Use higher rates such as 50 or 60 only for slow motion or sport.
A frame rate is the number of still images captured or shown each second. Our eyes blend them into motion. Lower rates such as 24 frames per second (fps) give the slight motion blur we associate with cinema; higher rates such as 50 or 60 look smoother and more like live television.
Timecode counts frames, so the timecode rate must match the project. If the camera records at 25 fps but the sound recorder's timecode runs at 24, the numbers drift apart by a second every 24 seconds and automatic syncing fails. On set, the sound recordist usually sets the master rate, and everyone else is jammed to it. The frame rate on the slate should say the same thing.
These look almost identical but are not interchangeable. Mixing them is one of the most common causes of sound slowly drifting out of sync over a long take. If your project is 23.976, make sure the camera is set to 23.976 and not 24, and that the sound recorder and slate are too.
True-Slate supports the common rates from 23.976 to 60 fps, including drop and non-drop frame, and shows the rate on the slate so it is captured on every take. When you jam to the sound recorder's LTC, choose the same rate the recorder is set to.
25 fps is standard for UK broadcast and online work and avoids flicker under 50 Hz lighting. Cinema features may still shoot 24, but check the delivery spec.
You can, but it needs converting, and sound recorded against one rate will drift against picture at the other. Keep the whole shoot at one rate.
Shoot at a multiple of your project rate, such as 50 fps for a 25 fps project, so playback at the project rate gives smooth half-speed motion.
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