you could probably do this over iCloud. Set your phone to download all files, run the ffmpeg script on your computer and place the files in iCloud. If you need

you could probably do this over iCloud. Set your phone to download all files, run the ffmpeg script on your computer and place the files in iCloud. If you need a to open the iCloud app to force a sync, use Shortcuts to open the app at 3am or whatever. If you're on Android, a program like Tasker could and Google Drive could likely accomplish the same results.