FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
mzainuddinahm
Article Id 250298
Description This article describes how to block audio and video files using a File Filter.
Scope File Filter can be used to block files of different file types as well as audio and video. While all the file types can be blocked without issues, audio and video files may be allowed in spite of blocking them.
Solution

Disable streaming-content-bypass in:

 

# config firewall profile-protocol-options
    edit "Test_Profile"
        set oversize-log enable
        # config http
            set ports 80
            unset options
            unset post-lang
                set streaming-content-bypass disable <
        end

 

Now the audio and video files should be blocked.

 

Related document:

https://docs.fortinet.com/document/fortigate/6.2.1/cli-reference/234620/firewall-profile-protocol-op...