anti-virus is not the problem here Becky. No videos import into Lightroom in Windows version, yet they import fine into Lightroom 3.  The beta gives me an error message saying "The movie files contain no video frames."

You wouild need to disable anti-virus and reinstall LR4 Beta to test Becky's suggestion.  The missing files are not making it into the directories on install.

That will work if the files are strictly in quarantine. If they were barred from disk inclusion in the beginning, a fresh install might pick them back up.  My previous post should have said 'May" not "Would"

(Win 7 Pro 64) Had a similar problem but resolved it:-

Standard issues to eliminate are antivirus, firewall.  Antivirus because it might have blocked the files during installation or at runtime, and firewall because the firewall can do funny things at times.

At some point during or shortly after the installation my Zone-alarms firewall popped up a message about a program wanting permission to access the internet and having been caught in the past by letting unknown programs access the internet I blocked it.  Turns out the program I blocked was dynamiclinkmediaserver which sounded like spyware to me.

Went into ZA and enabled access. Also went into the LR folder under program files and manually started the dynamicmedia applications (see above for link). That worked.

Rebooted the machine and it works now without the need for any manual intervention.

The issue seems to be related to Win 7 64, but that might be irrelevant.

There are two facts we have in common. Firstly video isn't/wasn't working on certain environments and secondly the video module does work on others. This thread has suggested a few approaches including:

1) improper installation

2) reboot (it seems to be Windows affected predominantly)

3) firewall/anti-virus blocking elements

4) Quicktime version not being current (7.7.1??) or not being installed

5) dynamiclinkmediaserver and/or dynamicmediaserver not running or not installed

I would start with the easiest to check first:

1) is Quicktime installed and current

2) have the correct files been installed - see Becky's post earlier [

               qtparser.dll

               mc_dec_aac.dll [correction to her post avc vs acc?]

               mc_config_avc.dll

               mc_enc_dv.dll

               mc_config_avc.dll]

3) has the AV/firewall quarantined/blocked those files or dynamiclinkmediaserver

4) are the following programs running (stone.pan post earlier) - PS: make sure all three processes Adobe QT32 server.exe, dynamiclinkmediaserver.exe and dynamiclinkmanager.exe are running

  - dynamiclinkmediaserver (on Win7 C:\Program Files\Adobe\Adobe Photoshop Lightroom 4\Support\DynamicLinkMediaServer\dynamiclinkmediaserver\1.0)

  - dynamiclinkmanager (on Win7 C:\Program Files\Adobe\Adobe Photoshop Lightroom 4\Support\DynamicLinkSupport\dynamiclink\CS6)

Mine didn't work at all. Then I unblocked my firewall and it just hung doing nothing. Then I did a full reboot and it works as expected on numerous formats from numerous sources.

Thanks, Becky!  I was starting to worry this issue was slipping under the radar.

1. English, Windows 7 Pro 64-bit (6.1 build 7601)

2. Self/Custom purchase & install (not OEM)

3. Sending via PM

Update - I re-read your message and note you are looking for examples of users who *can* import other formats, but *not* avi.  I apologize -- I am in the "cannot import any video files at all" camp, so my example might not be relevant.

I still see the same video issue with the production 4.0 released yesterday.

Completely removed LR4-beta, rebooted clean, disabled all anti-virus services (Avast and SpyBot S&D in my case), installed LR4.  Tried import, same behavior.  Rebooted again clean, disabled all anti-virus, tried import, same behavior.  Rebooted again clean, left anti-virus running, tried import again, same behavior.

"same behavior" == Import hangs, dynamiclinkmediaserver process spikes and maintains 50% cpu constantly.  I eventually kill dynamiclinkmediaserver manually, and LR4 reports import failed.