Short question :
I have taken a video screen recording on my iPhone and imported it to my computer, when i try to compress or share the file it keeps stripping the audio from the video and im just left with a video with no sound. Any ideas why ?
Long questions with background :
I have a screen recording video that I've done on my iPhone 8, iOS 12, showing someone how to do something in the Sonos app, in this video you can hear music playing muffled in the background as i show me changing tracks and can see album covers on my screen.
Ive imported the screen recording to my computer running OSX 10.11 and it works fine. I then trimmed the video in quicktime to remove the beginning, still all working fine. But now ive got a 70MB 2 minute video i cant email.
I get the videos from my iOS device to my OSX device using the dropbox App on the iOS device to upload the video. The file format is Mp4.
Ive tried running it through Handbrake, to compress the video which takes it down to c. 9MB, but for some reason it strips the audio, even through the the audio settings are not set to strip the audio.
Here are the settings im using in Handrake : https://imgur.com/a/GOBwmUc
I then tried to add the 70MB video to my dropbox folder and sharing the video from there, when i create the share link it again has now audio.
I then tried uploading it to youtube as a private video, but again the video has no audio.
Any ideas whats going on here, i would expect Youtube to remove audio tracks if its algorithm detected copyrighted data, but not dropbox, or Handbrake. Is this what is happening ? Or do iOS screen recored videos encode their audio tracks in some odd way that other systems have a hard time processing ?
How can i get around this so that i can share this video with the person i made it for ?