Whammo. My videos wouldn’t play anymore. Well, actually, they’d play audio, but the video was just black.
I thought it was the particular app I was using, so I tried Media Center, and Microsoft’s Media Player. Same result.
From past experiences, I figured something had hosed a codec (codecs are utility libraries installed on your machine that code and decode video and audio files, each format has it’s own codec).
But, where to start looking?
So, I did some googling and found a great page that lists all the various FOURCC codes for codecs:
From that, I found a little app you run against a specific AVI to determine what codec it uses, called GSPOT:
Running that against the AVI in question yielded the XVID codec.
Alternatively, just view the AVI in a hex editor and look at the header in the file:
You should be able to pick out the four character CC code fairly readily.
Then, from the table at FOURCC, I went to the xvid codec page:
Downloaded and installed. Presto! Videos with audio and video again!
It’s just that simple