Can not transfer the video stream fastly!

Hi!
I tried to send an avi file and got it with the following settings:

Transmitter:
- Packet length: 8000 bytes
- packetspersecond: 10
- SchedulingTimeout: 100000
- ExpireTimeout: 1000000
- PayloadFormat: DynamicPayloadFormat(100, 90000)
- period = 1000/packetspersecond
- sending packet: putData(timestamp*i,(const unsigned char *)paq,lpaq);
- timestamp: 9000

Receiver:
- SchedulingTimeout: 100000
- ExpireTimeout: 1000000
- period: 100

But when I tried to send 100 packets per second, it didn't work. The packets 
arrived delayed and most of them were lost (only 15% packets arrived 
correctly).

Anybody can help me? The changes I did were the following:
- packetspersecond: 100
- timestamp: 900

- period: 10

I tried to send larger packets, but I can't send larger than 8152 bytes (UDP 
MTU).

Thanks for help

MARIO