Turn on [CC] to read an excellent description of what is happening here. These are the words of Mark Gray at Spacecraft Films.
The source video for that text is here: [ Ссылка ]
You can support his excellent work at his website here: [ Ссылка ]

To hear his narration as a voiceover to this launch video, click here:
[ Ссылка ]

I wasn't able to find a fully satisfying video of this angle of the Saturn V launch in slow motion, so I put this one together myself. Excellent visuals have been available, but there was no good audio that had been paired with it, so what has been done here is the launch audio from Moonshot One has been added (from the 16m20s point in that movie) with a good bit of processing.

The most significant change that was made to the audio is that it had to be extended to match the length of the slow motion camera film. 500fps played back at 30fps is a timestretch that's greater than 16x realtime. So the source audio was extended by a lot.

The audio starts with a countdown of the final seconds prior to engine start. This is very misleading as it gives the audible impression that the visuals are running at realtime, which is far from accurate. The decision was made to keep this in as a matter of artistic license. Because of the significant manipulations that were done to make this audio track fit, I would not advise it to be used for the purpose of making scientific or engineering conclusions about this rocket launch. Visuals, yes. But not this audio. Source audio is where I would turn to for something like that.

COPYRIGHT NOTICE: My understanding is that the source video and audio used to make this are in the Public Domain, consistent with material released by NASA. A significant aspect of this video does fall under copyright, and that is the words that are presented in the Closed Captioning. These words are by Mark Gray at Spacecraft Films. (Links posted at the top.)

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