LDN Video Streaming Problem!!

[hpa]

I'm having Problems with my LDN connection.
I'm am getting good speed on downloads, but not at all good on video streaming.
You tube and other streaming sites are loading well (Until I open a video to watch!)

I'm from Bahawalpur. Using LDN @ 1mbps connetion.

Usually I get a constant download rate of 120 KB/Sec
But today, DU meter is fluctuating between 5 KB/Sec to 50 KB/Sec, for streaming videos....

The DU meter fluctuates to 110KB/Sec, when I open graphically-heavy and flash sites, so it means that the problem is only with Streaming Videos!

What could the problem Be?

Here is my this months usage (not the whole month, actually):

[alitayyab]

0. Clear Cache (browser)
1. LDN could be throttling video streams (highly unlikely)
2. log on to: Google Video
3. Search for any random video.
4. you would probably get hits from mulitple sites for the same video
5. see if any of those play okay.