Update Dec 11, 2018: Apple has (finally) updated their KnowledgeBase Website with much more detail about which codecs will be affected by the next update of MacOS: https://support.apple.com/en-us/HT209000
Everybody was there — opening Final Cut Pro 10.4.4 for the first time when the warning about Legacy codecs/media popped up on the screen. It would have been nice if FCPX tagged any videos using these codecs, but it didn’t. This question gets asked frequently on Apple Support Communities Final Cut Pro forum.
So, thanks to Tom Wolsky and the fine support at Apple Support Community forums, here is the list (or as much of it as we’ve been able to assemble… so far!)
- Apple BMP
- Apple Cinepak
- Apple Component Video – YUV422
- Apple Graphics
- Apple H.261
- Apple Motion JPEG A
- Apple Motion JPEG B
- Apple None
- Apple Pixlet Video
- Apple Planar RGB
- Apple PNG
- Apple TGA
- Apple TIFF
- Apple Video
- H.263
- JPEG 2000 Encoder
- Sorenson Video 3 Compressor
- Sorenson Video Compressor
Also third party codecs installed in QuickTime.
- AVID 1:1x
- AVID Meridien Compressed Codec
- AVID Meridien Uncompressed Codec
- AVID DV100 Codec
- AVID DNxHR Codec
- AVID DNxHD Codec
- AVID DV Codec
- AVID JPEG 2000 Codec
- AVID MPEG2 50mbit Codec
- AVID RGBPacked Codec
- AVID Packed Codec
- RED Digital Cinema REDCODE
Should also include
- GoPro CineForm
- Sony HDCAM SR
To see which Legacy Video Codecs you have installed, open Terminal and type (or copy and paste the following):
qtdefaults read InstalledLegacyVideoCodecs
Hope this helps!