The comparison of transmission protocols, HLS, UDP and HTTP.

    The article describes the difference of 3 protocols

    UDP (multicast)

    Multicast is UDP packets transmitted from one source to a group of subscribers. The address to which such packets are sent is typically between and, but is not recommended because of the large number of specialized addresses.
    The oldest way to deliver a TV signal to the user: stream is sent as udp-packets broadcast.

    UDP-similar to the transfer of goods catapult-launched and forgotten. whether or not we got caught or not, it's not the concern of the one who launched it.

    This is a significant drawback: the broadcaster cannot diagnose the problem with the client, that is, if there is a loss of udp packets, kubiri and spillages will appear on the TV screen.

    Multicast can be used only in local networks, as Internet routers do not route multicast. For routing in a local network-special multicast pim-routers are used. Highly loads the network, and requires high-quality network equipment.
    Of the advantages-good compatibility with old set-top boxes as well as saving network bandwidth (that is, if one switch 5 users watch the first channel - in the uplink of the switch will be only 1 subscription instead of 5).

    May be used for authorization only using the stream cipher.

    UDP (unicast)

    Unicast-UDP packets transmitted from one source to the receiver address: for example: a server with the ip address and transfers the address reception is made by the client at his own address: Suitable for transmission of streams of real-time inside the head stations or receiving equipment on server decoding - transcoding.


    Яit is a Protocol for the transmission of audio and video data. The principle of broadcasting is similar to downloading an infinite file. It is well compatible with old set-top boxes, but with an unstable connection, transmission breaks are possible - just as when downloading a file via the Internet with an unstable connection.

    The principle of delivery is similar to the delivery of goods on the conveyor belt-deliver, but if there will not have time to unload, or there will be problems in the movement of the tape - delivery will stop.

    Authorization by login/password, ip/mac and encryption of biss or cas stream is possible.


    HLS (HTTP Live Streaming) is a Relatively new communication Protocol for HTTP-based media streaming developed by Apple as part of QuickTime, Safari, OS x and iOS software. The work is based on the principle of splitting the whole stream into small fragments - chunks, consistently downloaded over HTTP. The flow is continuous and can theoretically be infinite. At the beginning of the session, a playlist in M3U format containing metadata about the existing nested streams is downloaded

    HLS-similar to the delivery of cargo containers-deliver a lot of cargo at once (chunk), and while all unloaded, we still bring. If a container is not reached - we have plenty of time to deliver it again.

    Authorization by login / password, tokens, ip / mac is possible