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Unable to Import and Play MOV, Mp4 files in Lightroom Classic Mac 6.31.

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Last Modified: 2020-03-12
User can't view movies taken on iPhone and previously imported to Lightroom Classic Mac 6.3.1
They get a black screen, and there is no audio or video.

If they try and import a MOV or a MP4 into Lightroom, they get error message:
An unknown error has occurred while reading the video file.  Connection to Dynamic Link server failed (1)

They used to be able to view these same type of video files in previous versions of Lightroom Classic Mac.

They also have a lot of .AVI files - can these be viewed in Lightroom or do they need to be converted first?

Any known cause or solutions?  Thanks
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David FavorFractional CTO
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I had tried demos of professional converters that work for me - Leawo Total Media Converter, and Aimersoft Video converter.  Both of these didn't complete the conversion. I'll see if there's a log in either.
David Johnson, CDSimple Geek from the '70s
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if you are using Catalina Lightroom Classic Mac 6.31. is not supported

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Commented:
Thanks.  The user is still using High Sierra.
Fractional CTO
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First, test the files.  Can they be viewed with Quicktime or VLC?  You should make sure they're still actually viewable.
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