I made an App Store preview video using QuickTime player on OS X Yosemite.
When I try to upload the video to iTunesConnect, I get an error message:
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For Quicktime videos use this command line:
ffmpeg -r 30 -i 60fpsvideo.m4v 30fpsvideo.avi
I have followed the following steps :
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
then
brew install ffmpeg
then used the following command :
/usr/local/Cellar/ffmpeg/3.1.3/bin/ffmpeg -i SpeechToText_usage.mov -qscale 0 -r 24 -y speechtotext_framerate_changed.mov
It worked well!
For Quicktime videos user this command, worked for me fine:
ffmpeg -i demo_app.mov -qscale 0 -r 24 -y -vf scale=1080:1920,setsar=1:1 app_preview.mov
Videos can be easily converted using ffmpeg, a handy tool that can be installed using homebrew.
ffmpeg -r 30 -i 60fpsvideo.m4v -vcodec copy -acodec copy 30fpsvideo.avi
I found out, that there is no possibility to edit the frame rate in the QuickTime Player.
I ended up downloading trial version of Final Cut Pro. In Final Cut Pro it's just a few clicks.