That's "Woman in the Moon"/"Frau im Mond," a 1929 silent movie written and directed by Fritz Lang (who also made "Metropolis"):
Several prescient technical/operational features are presented during the film's 1920's launch sequence, which subsequently came into common operational use during America's postwar space race:So he didn't predict velco, eh? Well, then how prescient is it? Quite aside from prescience,* I was fascinated to just scroll randomly to the middle of a place in the film and — without the ability to read the German intertitle explaining what was going on — witnessed the most amazing Man Takes His Hands Out of His Pockets I have ever seen. Yes, rockets are awesome — but pockets? Make pockets awesome and I declare you a genius!
• the rocket ship Friede is fully built in a tall building and moved to the launch pad
• as launch approaches, the launch team counts down the seconds from ten to zero ("now" was used for zero), and Woman in the Moon is often cited as the first occurrence of the "countdown to zero" before a rocket launch.
•the rocket ship blasts off from a pool of water; water is commonly used today on launch pads to absorb and dissipate the extreme heat and damp the noise generated by the rocket exhaust
• in space, the rocket ejects its first stage and fires its second stage rocket, predicting the development of modern multistage orbital rockets
• the crew recline on horizontal beds to cope with the G-forces experienced during lift-off and pre-orbital acceleration
• floor foot straps are used to restrain the crew during zero gravity (Velcro is used today).
* Prescience ≈ pre-science. It ought to be a synonym for science fiction.