Audio but no video for .mov file.

For Windows XP (Home Edition 5.1.26700 Service Pack 3 Build 2600):
My QuickTime Player 7.6.6 shows a window but the window is empty only the audio is present.
The same or similar is the case in VLC, RealPlayer, and DivX Player.
Additional information from my Mac OS X:
- The .mov file plays perfectly on my iMac in my QuickTime Player 10.0(114).
- Cmd-I reports for the .mov file: codecs: H264,AAC.
- The file is produced by AddMovie version 1.8.6 from a .flv file and the developer states:
’AddMovie uses Mac OS technology "out of the box" so to speak. In other words all it does is call system functions that in turn call the codecs installed on your system to do their job. I don't write any codecs (i.e. compressor/decompressors - i.e. exporters/importers) - other third party developers do that. So, getting the output of AddMovie to be compliant for other software depends on your choice of these third party add-ons, and the selection of them in the preferences window.‘
- Perian 1.2.1 and Flip4Mac 2.3.4.1 are installed.
- VLC version 1.1.2 is installed and it plays the .mov file with audio but no video like QuickTime Player in Windows.

Thanks again, QuickTimeKirk.
I think the audio rate was to blame. I changed the audio format in QuickTime Player 7 Pro from (I think) Linear PCM to AAC and the kbps number from the default value 128 to 64. Then I changed the mark for the video rate from automatic to the option of setting a limit and set a suitable limit. That way I was able to control the total kbit/second rate for the exported .mov file so that it got a reasonable size.
When I compare the source .flv file with the produced .mov file for the case when they have about the same total kbit/second rate, I can see that the .mov file is smoother or has less detail than the .flv file although the difference is not big. Increasing the video rate limit in QuickTime Player 7 Pro causes a bigger .mov file with better quality to be produced.

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