When I was calling

Internal`$VideoEncodings

Mathematica gave a message:

ImportExport`RegisterFormat::noexe: Could not install QuickTime.exe.

and the output is not a list but

System`ConvertersDump`out$2191

I just don't understand why this happens. I have this problem with Windows 10 and Mathematica 11.3.0, and I have tried installing Quicktime 7.7.9 from Apple and it did not solve this problem.

Is there anybody having the same problem?

Thanks.

Edit 1:

I checked the same code with Mathematica_10.4.1 and it worked well!

Then I checked the installation directories of these 2 versions of Mathematica and searched for the file "QuickTime.exe". It turns out that this file exists in 10.4.1 but no in 11.3.0. I think this may causing this problem.