Thanks to you both! I'll try both of those.
I received a video by email, as an attached mp4. When I bring it into Vegas, the audio is there, but there's no video.
Any idea what would cause that?
.mp4 is just a container. Vegas probably doesn't support the codec hiding inside it. Use Gspot to identify the codec - Get CCCP and try again. if it still doesn't open, try using something else to convert it into a vegas friendly format.
The easiest way I've found to get videos off the net is the following.
Download Firefox or Chrome browser (Firefox has the edge here)
Then simply Google "Firefox (or chrome) youtube downloader" You will find many add-ons. I'm not at my computer so I can't tell you which I'm using right now, but several of them work really well. Just try a few until you find one you like. Some will give you the option to download the file in MP4 or FLV format. No need to use an external website and have the file emailed you you.
Mmm... mine is lot more complex but possibly more dynamic: Load the video up, look in your browser cache and copy the temporary video file. Run it though FFMPEG (preferably using a GUI like Avanti) to a decent bitrate H.264 video file and it's good to go.