Support Center

Product support and useful documentation

Error When Opening Avid DNxHD Encoded Files in Apple Quicktime

Modified on: 2019-10-15 17:03:52 +0100


When attempting to open an AVID DNxHD file in QuickTime 10, you are asked for a MediaSeal Authentication Password, which you enter correctly.  The authentication is successful, however QuickTime reports that the file is not a valid QuickTime file.


DNxHD is a codec specifically created by AVID for use in AVID Applications such as Pro Tools.

AVID DNxHD formats are not supported by the latest versions of Apple’s QuickTime player.  


In order to view DNxHD files, you will need to install the AVID Codec LE and use a Media Player that supports the DNxHD codecs e.g.  QuickTime 7 

Download link to Codec:

Download link to QuickTime 7:

Did you find it helpful? Yes No

Send feedback
Sorry we couldn't be helpful. Help us improve this article with your feedback.
Can you please tell us how we can improve this article?