From LedHed's Wiki
To link a youtube video so that it opens in Hi-Def (1080p) append "&fmt=37" to the end of the link.
&fmt=37
For example:
Normal Link
http://www.youtube.com/watch?v=ysSxxIqKNN0
Hi-Def Link
http://www.youtube.com/watch?v=ysSxxIqKNN0&fmt=37
To link to at 720p resolution use:
&fmt=22
Resolutions & Format
| Youtube fmt Codes | ||
|---|---|---|
| fmt# | Resolution | Format |
| 5 | 240p | FLV |
| 17 | 176x144 | 3GP |
| 18 | 360P | MP4 |
| 22 | 720p | MP4 |
| 34 | 360p | FLV |
| 35 | 480p | FLV |
| 37 | 1080p | MP4 |