Category "avasset"

Change volume of audio track within AVMutableComposition

I'm trying to merge a pre-existing video with a newly recorded audio voiceover track. User can set the relative sound volume for the two audio tracks (audio bel

macOS modify the cover art (ArtWork) of a video file, I found some API code, but it fails to modify any metadata

As the title. I am writing an app for macOS. Used to modify the cover (ArtWork) and title of the video file. I found some API code, it doesn't work, any metadat