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Music or video production studios typically have a central clock, so for this use-case the sample rates should be perfect. But even if the input and output devi
by cnvogel 12y ago
Music or video production studios typically have a central clock, so for this use-case the sample rates should be perfect. But even if the input and output devices are on perfect clocks, with NTSC (59.94 Hz), you'd need a very odd number of samples per video frame in your software, if your processing would happen at a integer fraction of the video frame rate.
- nitrogen 12y agoDo you know whether studios use 48000Hz with 59.94fps or 48000/1.001 ≈ 47952Hz? Does converting from 24fps film to 23.976fps Blu-ray require resampling the audio? Or are films recoded at 48048Hz and then slowed to 48000 for consumer release?
- e12e 12y agoThe short answer is that it's complicated. Digital film (DCP) is typically 24 fps, asirc -- and that doesn't go well into 60, or 50. And the difference is enough that you need to drop a frame and/or stretch the audio. And sometimes this doesn't go so well. There's a relatively recent trend to try and record digital all the way, and this is also complicated. Record at 24 fps? At 30? At 60? 60 fps 4k is a lot of data. And sound is actually the major pain point -- video frames you can generally just drop/double, speed up/down a little to even things out. But 24 fps to 60 fps creates big enough gaps that audio pitch can become an issue.