Slo-Mo videos auto uploads as normal videos

[callebridholm]

When I film slow motion movies at my iPhone and then the Nextcloud app auto upload them the movie and I try to play it at my Windows laptop it is a regular movie without any slow motion. Is this a normal behavior or is the Nextcloud app doing something wrong?

iOS version: 11.3

App version: 2.20.8.00003

Server configuration

Operating system: Debian 9.4

Web server: Apache 2.4.25

Database:MariaDB 15.1

PHP version: PHP 7.0.27-0+deb9u1

Nextcloud version:13.0.2

[marinofaggiana]

Hi @spridarn thanks for you report. When I have a bit of time make a test

[hholtmann]

1. SlowMo Videos are normal videos files recorded with 120fps or 240fps. Nextcloud transfers the originally video file. If you watch these videos on iOS (e.g. in the Photos App) a "suggested part" of the video is played down at low speed, which gives you the Slo-Motion effect. This also works on QuickTime-Player in macOS.
   However, if you use a non Apple video player (e.g. on Windows) it will play back as a normal 120fps/240fps video unless you slow down certain parts in a video editor (Premiere etc).
   Please see also Apple's technical notes for Slo-Mo files: https://support.apple.com/en-us/HT204064
   So technically NextCloud is doing the correct thing here:

2. When you send a SloMo-Video e.g. by the iOS Mail App it gets reencoded into a 30fps video with the Slo-Mo part being applied. So it will playback "correctly" on any platform, but it's not the original file anymore and the Slo-Mo part can be changed.