higher setting often improves video quality
Packet Stuffing: fills the outgoing stream with blank data as needed to maintain an output bitrate at the
Target Bitrate. This setting is useful for checking that the full amount of data can get through if needed.
Target Decoder
Destination IP: target IP address for the Decoder to which the video stream will be sent. Unicast and multicast
addresses are supported. 224.1.1.1 is an example of a Multicast IP address
Destination Port: IP port number for outbound ACT-L3/L5 UDP stream (default: 1770)
IP Packet Size: the size of the IP packet (default: 1392)
Forward Error Correction
FEC recovers lost packets due to varying network conditions. This setting refers to the number of redundant
packets sent to compensate for variable network conditions.
FEC: FEC is denoted as “R-S x% (D/F)” in the Encoder interface, where D stands for number of data packets, F
stands for number of FEC packets, and x% is the percentage of the data stream that will be consumed by Burst
FEC.
Shuffle: Rearranges the FEC packet sequence for ‘burst’ error protection. The following formula is used to
calculate the recommended setting for the Decoder when shuffle is enabled: buffer/jitter size in packets = FEC
packets X shuffle size
Protocol
Streambox offers two types of Transport Protocol for streaming, UDP and LDMP. Both use the UDP network
protocol. LDMP is a Streambox-proprietary protocol which uses 2-way UDP streaming.
● CWND sets the maximum Congestion Window, the number of packets sent but not yet acknowledged,
for all interfaces combined.
● CWND MIN sets the minimum congestion window for each individual interface. When using a single
network connection, this value should be the same as the CWND value above; when using two
connections, this value should be half the CWND.
● CWND MAX sets the maximum congestion window for each individual interface. When using a single
network connection, this value should be the same as the CWND value above.
● ACK Timeout (Acknowledgement Timeout) is the number of milliseconds the Encoder will wait for
confirmation that a packet arrived before it tries to resend. This setting affects allowed latency of the
stream because interfaces (USB modems for example) that are too slow and don’t meet this
requirement will not be used. This is how LDMP is able to guarantee latency. If your total bandwidth
seems very low, then try raising this number.
● Send Timeout is the number of milliseconds without response from a Decoder (or other receiver) after
which the Encoder will consider the connection dead.
● RTT Multiplier tells the Decoder how much predictive jitter buffer to create for out of order packets.
Increasing this value will increase reliability and latency when multiple interfaces are used.
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