Video problems - mp4, DivX, QuickTime compatibility, converting m2t

At first my Mac didn't recognize AVI files natively in QuickTime, but VLC could play them. I installed DivX and now it will play AVI, .mov and .mp4 converted from an m2t stream (using VisualHub and MPEG StreamClip), and most other formats, however, certain *.mp4 files that were working before now no longer work in Quick Look or QuickTime. As far as I can tell, they are all videos converted from YouTube with TubeSock. What could be causing this? Before DivX, QuickTime played them; now, they're simply plain white videos with the sound intact.

Can you run get info on the files in quicktime player? It might be worth uninstalling DivX and trying Perian instead.
If you prefer to get to the bottom of the issue instead of just working around it, dig up the video on Youtube again, re-download and re-convert. See if it happens again.
If it does, go back to the youtube page again and open the activity window in safari. Here you will find an entry with a drop down arrow for each tab or window you have open. They are all labelled with their URLs. Find the YT page and click the drop arrow. This will give you a load more YT URLs. You are looking for one with .flv in it (not necessarily at the end). Click this one to highlight it, then copy it. Then open the downloads window and paste into it. The flash video will now download. (This is what Tubesock is doing for you.)
Try converting the .flv again with Visual Hub or Streamclip. If it still goes wrong at least you have eliminated Tubesock as the culprit.

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