&fmt=18 does not give the same quality as playing by "high quality

[arminio]

"Famous" Youtube "&fmt" parametter has bug or what?!

Video encoded in H.264 in 640x360 after upload and encoding has "high quality" link which give very good and superior quality than "normal" playback. Now, if I try to play it with &fmt=18 parametter, youtube plays it with something between normal and high!?

Check this video to see what I mean:

normal quality: http://www.youtube.com/watch?v=XXXJ28OLg3Y - playback is bad

Click on "hight quality" - playback quality is very good

&fmt=18: http://www.youtube.com/watch?v=XXXJ28OLg3Y&fmt=18 - clearly better than norman but also less quality than playback after clicking on "high quality"

This is particulary visible at the begining when logo fades in and out...

It is obvious that &fmt=18 does not give the same quality as clicking on "high quality" below video! Any ideas why and how to force that "clicked" high quality in URL?

[arminio]

Problem solved! &fmt=18 is not equivalent of "watch in high quality". It is &fmt=35!

[zilog jones]

It goes up to 35 now? I thought 22 was the best!

[arminio]

It is pretty messy and you need to test what's the best for your upload... all this &fmt parametters are "unnofficial". It is really shame that YouTube is so popular and also so problematic. For my videos (640x360), &fmt=35 gives the best quality. For HD uploads, it is 22 I think...