I'm trying to upload an XVID avi I created using Gordian Knot onto youtube. It's from a home video NTSC DVD. The conversion when I play it on VLC media player looks really good. However, when I upload it onto youtube, it looks really blocky where you can see a grid. I'm assuming this has something to do with the flash streaming that youtube uses. I tried converting it several times with different levels of compression. All of them looked just fine when I played them, but same problem with youtube. Any suggestions by someone who has an idea what might be happening would be greatly appreciated.