verifying progress bar on every file.

I can't replicate this on my two Macs (one SSD and one Fusion drive).

I have tried opening movie files on network shares and locally and they all just open. The network share was a spinning hard drive external disk.

I don't remember seeing any mention of this in the beta.

Maybe there is more to it.

How were the movies created (software, codec)?

Does it happen with any other file types?

Perhaps there is some other software causing interference. Have you tried on a complete erase and reinstall without adding any other software or just in Safe Mode?

The quarantine check will happen with certain types of downloaded files.

I have just checked that when the "verifying..." dialog opens, the service Xprotect starts, so it is it!

Well all aorked out. Had to click and drag files apps and such from time machine. Now videos are opening fine.

Hello,

My name is Stefano and I write from italy, sorry my bad English. I have the same problem too. When I run very large files, such as mov in 4K, a message "Verify (file name)" appears, the expectations are very long. The message bar is called CoreServiceUIAgent. I contacted Apple support, but they did not fix the problem. They told me that he is known and will soon leave an update. I can not work with my 4K files, the expectations for vision are exhausting.

Thanks so much.

I don't have FileVault activated but that doesn't mean to say that is right. I looked up the Internet and found this:-

"FileVault was first introduced in 2003 as part of Mac OS X 10.3 Panther as an on-the-fly encryption scheme for protecting a user’s data. Once enabled, a user’s data was encrypted by the operating system within a sparse disk image (later operating systems utilized the more efficient sparse bundle disk images). While a user’s account password could unlock the FileVault encryption when logging into the Mac, the user would also need to create a “Master Password” in the event that the user account password was lost. While logged in, Legacy FileVault would decrypt and re-encrypt data as the user needed it, all on demand.

While certainly not required, the benefit of FileVault was that user data was protected from unauthorized users or thieves who lacked the necessary password. If your Mac was stolen, for example, FileVault-encrypted data would be very difficult for a thief to access. While less technologically savvy thieves under normal circumstances may be thwarted by a user account password, those with any experience would be easily able to pull the Mac’s hard drive, attach it to a second system, and enjoy unfettered access to the drive’s data. But if the user’s data was encrypted, it would generally be safe from those without the FileVault password." .......personally, I think you have to way up the pro's and cons in that when you have FileVault enabled playing back a VLC media file is delayed while there is a verifying process taking place and when it's not enabled it all works fine. So it is up to you what you can or not live with....Delay in playing a file or not a Delay. Maybe others who are more technically minded may want to join in on this discussion and help

Going for clean install right now. Gonna create user and see if problem is there. Then I will use migration assistant and hopefully get my stuff back on. Ha!

Dear Apple Specialist.
I have now checked and YES, it is an issue also with the completely new Macbook Pro in Apple Store.

So, do we have anyone at Apple who is paid to handle such issues, or it is a responsibility of users who have imagined new OS will be able to perform basic OS functions, but were wrong? Maybe it's user's fault after all?

Let's be clear, there can be bugs in the new software, but not where it relates to basic functionality of the OS. That has to be tested before release.

Thanks.

Yes, it works just for once.

If I try to open that same file again, high sierra try to verify it again and again.

I can't understand why QuickTimePlayer open media files without any verification at first.

If the security is very *ucking important, why they do not verify all media files at first?

This started happening to me once upgraded to High Sierra. I have a network drive shared with smb protocol, which always worked flawlessly. Now every movie I try to play (any type, mkv, avi,...) I have to wait minutes while the application (QuickTime or VLC) "verifies" the file...

At this point and time No One should have to do a complete erase and reinstall.

Sure there is. If you have a problem that only affects a very small subset of users, there is likely something unique about your configuration. Eliminating all possible software conflicts is a necessary troubleshooting step. You can uninstall one-by-one, but it is simpler to just nuke it and test.

I must have missed the post where someone reported doing that. The closest I found was someone tried it on a Mac at an Apple Store. It could be something with the new hardware. As I stated, I do not see the problem on my two older Macs. There also isn't thousands of people piling on with "me too," just a handful. So, the problem may be fixable, but you can't fix it without troubleshooting.

It could be software, it could be hardware, it could be specific file type.

The largest video file I have to test is 4GB and it opened immediately without any "verifying" dialog box. That was on an external spinning hard drive. I tried a 2.5GB file from a NAS mounted via SMB. Same result.

It may not be worth any of your time to troubleshoot, but that's pretty much all you've got if Apple says it works as designed.

More on this.

It is not a cifs or smb issue.

If I connect to the drive with the applescript:

tell application "Finder" to open location "smb://<share>"

I get the "verifying" problem. If I just open the server conection window in FInder (Cmd-K) and write:

smb://<share>

it works...

When mounting the share with an Applescript, I get the "quarantine" flag on the share. If I mount it from Finder "Connect to Server" the flag is not there.

Quarantine is a side-effect. The issue is in the mounting code.

You can remove the side-effect, but this will expose your Mac to vulnerability and you didn't fixed the problem.

Ok I have deactivated the FileVault and it seems to be working now. The request to verify the files before they are played in VLC is no longer there. With the FileVault now deactivated, is the computer exposed to more danger regarding the malware?