@iaburn:
Thank you for this great work, and for trying again. Now there is QtMultimedia again. This did not exist when I tried it last time. So now there is audio playback. Yay. Here my findings as far:
- Your compiled version runs on macOS 11.7.1 on M1
- It processes with identical speed as the latest revision with Qt 5.15.2, playback speed is also identical.
- Sound playback is working
- AVFoundation is working, at least without sound. When attaching the sound via ffmpeg onto the Apple encoded video, the app hangs. That is what you described. Without sound the video is fine.
- Darkthemes are broken. No idea why. I tried updating to the latest theme revision - same problem. The theme test application works fine. More work needed.
- Export settings preset saving is broken
- I was able to compile on IntelMac with BigSur
--> not bad for that try!!!

Now another thing came into my mind: compatibility. For latest OS - Windows 11 and macOS13 - it would be awesome to use Qt libraries which are officially supported. There are some problems with both. On the other side Qt5 works from macOS 10.9.5 and from Win7 up to latest OSes, while Qt6.4 works from macOS 10.14 and Win10. Many users could not use MLVApp if we just offer a Qt6.4 version, including myself: all my Macs appart from my M1 Macbook could not run MLVApp. I'd like to make a suggestion: what about making the app beeing able to be compiled with both Qt versions? I started adding your code into our old code with some precompiler instructions. I already get it compiled with both Qts.