ZEC Adding RIST Outputs

3 min

the rist output can be push streams or have them pulled to/from a rist enabled device rist seeks to provide reliable, high performance media transport by using udp at the transport layer to avoid the inefficiencies of tcp, then layering on top forward error correction and retransmits to add the reliability inherently absent from udp zixi supports the following rist profiles simple profile (push only) the rist simple profile provides best in class packet protection, as well as support for multi link bonding and seamless switching main profile (push/pull) – the rist main profile builds upon the features of the simple profile to provide backwards compatibility, while opening the door for additional features, including encryption and authentication rist main profile uses industry standard dtls or psk with a variety of available cyphers to ensure the most up to date protection, while being flexible to accommodate local legal regulations support for pre shared keys is also included, which makes rist main profile compatible with one to many environments such as satellite or multicast distribution native tunneling and multiplexing the ability to combine multiple simple profile rist streams into one single connection, optionally with one single encryption and authentication step, using industry standard gre over udp bandwidth optimization by deleting null packets at the source and re inserting them at the destination support for high bit rate streams the rist main profile includes an rtp header extension which increases the sequence number size to 32 bits, and therefore increases the maximum size of retransmission buffers, and thus opens the door for higher bitrate streams, such as lightly compressed (e g , jpeg 2000, tico) and uncompressed video contact your zixi representative to learn more about interoperability testing between zec and 3rd party devices more details about rist can be found at www rist tv http //www rist tv/ to create a rist output in the zec outputs page, click +new output the new output window is displayed select rist option (radio button) type in the unique identifier for this output in the output name select an input stream to be made available on this output from the drop down list select the show in matrix check box to display this stream in the matrix (see zec using the matrix docid\ ofxethpsuo9eimqpwfzea ) default selected specify the output parameters (see output stream parameters table docid\ t95dhot0jijexltqpbqaz below) if you want to remux the stream to cbr (used for professional irds) in order to avoid bandwidth waste or add null packets and adjust the stream clock (pcr) in order to make the stream cbr, select remultiplex/pad and configure the respective parameters ( see output stream parameters table docid\ t95dhot0jijexltqpbqaz ) you can decrypt an encrypted stream as it enters the zec to decrypt a stream, select the decrypt stream checkbox and fill in the parameters as described in the output stream parameters table docid\ t95dhot0jijexltqpbqaz below for more information, see decrypting an output stream in zec docid\ fqloypidpib19cqfvu8rz click ok the new rist with its settings is created and now appears on the screen output stream parameters table parameter description output parameters profile select one of the following rist profiles that matches the input stream simple profile (default) main profile type (main profile) push pull host specify the destination ip address or url of the host to which the stream will be pushed port specify the target udp port \ttl\ \specify the time to live (ttl) used mainly to limit the range (or “scope”) of a multicast transmission leaving it blank uses the default value specified by the operating system \ 204b ts packet enable this option if the stream has an mpeg ts that uses 204 byte packets this will allow the udp packets to be aligned with mpeg ts packets ssrc enter an ssrc identifier for the rtp session the ssrc identifier is a randomly chosen value meant to be globally unique within a particular rtp session smoothing \[mms] enables transmission of the output at the correct rate required when the receiving device is sensitive and can’t lock onto the stream (in such a case, the recommended latency is 100 1000 ms) smpte 2022 fec in the smpte 2022 fec standard, 1 d and 2 d parity codes are systematic fec codes of decent complexity that provide protection against bursty or random losses this setting can be modified without interrupting an existing stream to enable smpte 2022 fec (forward error correction), select one of the following parity options from the drop down menu 1d smpte 2022 1d can fix a problem in one packet per row this means that the number of rows specified should consider the packet loss rate the shorter the row, the more error resilience can be achieved at the expense of the bitrate level however, longer rows increase the delay that the fec will add it is recommended to select this option when the packet loss is sporadic the stream will occupy the source port and two ports above it (e g , if the source port is 8988, it will occupy 8990) 2d smpte 2022 2d uses a table of packets, which includes rows and columns this option is more error resilient, but it increases the delay by (row column) packets and increases the bitrate with r+c packets per each table of r c packets it is recommended to select this option when packet loss is bursty the stream will occupy four ports above (e g , if the source port is 8988, it will occupy 8992) bind to ip select from the drop down list the local ip address to be used for this input, or select any to enable any ip to be used local port specify from which local port to source the stream, if desired (instead of randomly chosen by the operating system) rist main profile parameters (main profile) use dtls select this checkbox to encrypt the stream dynamically using dtls ignore tls certificate errors select this option when streaming to a trusted server that does not have a valid certificate when this option is selected, zixi broadcaster will ignore the tls certificate errors and transmit the stream to its destination user enter a user name password enter the password remultiplex/pad select this checkbox to enable remuxing from vbr mpeg ts to mpeg ts cbr (used for professional irds) or padding with null packets mode select one of the following pad – adds null packets and adjusts the stream clock (pcr) in order to make the stream cbr remultiplex performs demux >mux and rebuilds the stream according to the parameters below target bitrate \[kbps] specify the cbr bitrate to target for a remuxed stream pcr interval (ms) specify the frequency at which program clock reference is inserted into the outputs transport stream in milliseconds (default 90) \buffer size \[ms]\ \specify the size of the buffer that will be used for the remixing a larger buffer increases the quality, but also increases latency \ \no null packets\ \select this option to re multiplex the stream to cbr but remove the null packets in order to maintain a low bitrate \ enable decryption select this checkbox to decrypt an encrypted stream decryption type if the stream has been encrypted, you can decrypt it through the output by selecting this checkbox and specifying the type of encryption that was used select automatic to decrypt a stream that has been encrypted using automatic encryption only if the stream has not been encrypted, select none (default) important notice if the stream has been encrypted, you must decrypt it in the output decryption key if the decryption type includes a key, enter the key to decrypt the stream during output