[squid-users] Squid not caching some sites

My squid web cache proxy server is not caching sites such as...
http://www.netsmartz.org/resources/reallife.htm
http://www.netsmartz.org/stories/canttake.htm
http://www.nsteens.org/videos/social-networking/

These sites contain video that, when played, are choppy and cut out. I'm
certain that these videos aren't getting cached. And this is kind of the
point to the whole web cache project. I need for teachers to be able to
cache these kinds of things, so when the students try to access them they
play quicker and more smooth. How do I convince squid to cache these?

Here is my current squid.conf

http_port 3128
acl QUERY urlpath_regex cgi-bin \?
cache_mem 512 MB # May need to set lower if I run low on RAM
maximum_object_size_in_memory 2048 KB
# May need to set lower if I run low on RAM
maximum_object_size 1 GB
cache_dir aufs /cache 500000 256 256
redirect_rewrites_host_header off
cache_replacement_policy lru
acl all src all
acl localnet src 10.80.0.0/255.255.0.0
acl localhost src 127.0.0.1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/8
acl Safe_ports port 80 443 210 119 70 21 1025-65535
acl SSL_Ports port 443
acl CONNECT method CONNECT
http_access deny !Safe_ports
http_access deny CONNECT !SSL_Ports
http_access allow localnet
http_access allow localhost
http_access deny all
icp_port 0
refresh_pattern \.jpg$ 3600 50% 60
refresh_pattern \.gif$ 3600 50% 60
refresh_pattern \.css$ 3600 50% 60
refresh_pattern \.js$ 3600 50% 60
refresh_pattern \.html$ 300 50% 10
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 0 20% 4320
access_log /var/log/squid/access.log squid
visible_hostname AMSPX01

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