Re: Cinema Tools: Reverse TK of 29.97 DVCAM transfer of 23.98 HDCAM original

Video shot and played back at the same frame rate runs the same time as the original.

When film is shot at 24 fps, and transferred to video, it is slowed down by .1% so that it can evenly fit video at 29.97 or 23.98. So the film is played on the telecine machine at 23.976 frames per second, (slowed down by 1 part in 1000) when transferred to video.

When put in an edit system to be synced with dual system (separate) sound, there are two choices:

1) keep the film_telecined_to_video at 29.97 or 23.98, and slow the sound down by the same .1%. A couple ways that sound is slowed down: when recorded, the recorder's internal clock is used -- but on playback a video signal is used as the clock. Another way: the sound is recorded at 48,048 samples per second, but played back out at 48,000. Timecode is included as an addressing mechanism, but sometimes timecode settings affect sample rate. Sample rate and clock are what determines how fast audio goes by.

Or 2) you can speed the film_telecined_to_video back up, by playing at 24 fps, and just bring the sound in at it's original sample rate with its original clock.