When you want control over the codecs used and their settings, or have a large batch of movies to convert, use a transcoder like Compressor.
Compressor
32-bit apps and codecs die with macOS 10.15 later this year. Many video, audio and still image formats will become unusable as a result. Here’s what to do.
Apple has started the process of naming and shaming those apps which still don’t run in 64-bit mode, […]
How can I strip OS X down to improve iMovie’s performance?
I have been trying to burn some high-def movies to Blu-ray using Toast Titanium 11 Pro. All work fine except for one, which repeatedly ends up in standard definition. Why?
No matter how much disk storage you have, it just seems to fill up. Compressing little-used and archived items might be a good way to save space. Does it?
The Eclectic Light Company 