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This is strange. My brand new 16" MacBook Pro with M1 Max displays videos with transparent backgrounds as solid black. They work as expected on my intel based Macs. Anyone else noticing this?
Running MacOS 12.0.1
MacBook Pro 16″, macOS 12.0
OH LOOK, NEW PRO CODECS!
I BET they fixed it.
Alas… nope. :-(
Can confirm, still an issue when trying to encode ProRes 4444 with alpha channel using ffmpeg. Exports an unusable corrupted video file. How long until this is fixed!?
I have tested Keynote, DaVinci Resolve, and ffmpeg on the most recent version of MacOS (Montery 12.3.1) using M1 Max, and all alpha channels are preserved! Looks like the issue has been fixed.
I'm using Quicktime to convert a PNG sequence to a QT444 with alpha channel. Works like a charm on my intel machines, but the MBP with M1max not... :-(
Try compositing the video in a professional editor like Adobe Premiere or DaVinci Resolve. It may show black background in the preview, but in the editor it should work.
16" MacBook Pro M1 Max displays video with alpha channel as black
