[streaming] streaming switch --file-caching

[Xiaolin Cheng]

Hello all,

I was wondering what is the functionality of file-caching option. When I 
receive a stream and store it on disk, I set file-caching=2000 and 
udp-caching=0. However, the PSNR values are even less than the case of 
file-caching=1000.

Can somebody tell me how to set file-caching and udp-caching when receiving 
a stream and store it on disk?

Thanks.