The Zixi Broadcaster is the central component in the Zixi Video Network. Zixi Broadcaster takes video streams from Zixi Feeder, and can process the stream, enabling transcoding, transmuxing, recording, and distribution in multiple bit rates and protocols to any device anywhere. The Zixi Broadcaster is an intelligent and versatile video distribution component that may reside on premise at a customers site or is customers’ site, on the customer's cloud, or offered by Zixi as a cloud service.
Zixi Broadcaster offers the following features:
- Robust content delivery over IP - communicates with Zixi Feeder and Zixi Receiver over UDP-based, video-optimized protocols on private and public IP networks for maximal quality at a predictable latency
- Adaptive Bit Rate - Dynamically adjusts stream rate to adapt to changing network conditions, using unicast or multicast, to meet specific application requirements
- Transcoding - transcodes to a variety of different profiles and bit rates
- Format conversion – supports Internet protocols: HLS/HDS/MPEG-DASH/RTMP/FLV FLV/MPEG-TS over HTTP
- Recording - store streams as MPEG-TS files.
- Time-shifting – records the stream to delay its broadcasting
- Secure and rapid file transfer – accelerated and secure file transfers delivered at wire speed and accelerated HTTP delivery including optimized playback of HLS and HDS over UDP.
- VOD - stored files can be accessed on demand in multiple formats.
- Clustering and load balancing – supports cluster architectures to provide continuous uptime.
- Transport Stream Analyzer – MPEG-TS ETSI TR 101-290 analyzer (priorities 1 and 2)
- Content Analysis - analysis of the stream's audio and video content, including audio levels, audio silence detection, frozen video detection, and more.
- Monitoring - captures network and content specific statistical information in real-time.
- Supports many to many and any to any - gateway platform between UDP (unicast/multicast), Zixi protected stream (unicast/multicast), RTMP, or other supported formats.
- Network bonding with hit-less fail-over – reunites divided streams coming from multiple network channels into a single stream, enabling simultaneous load balancing between multiple networks and ensuring high availability of the stream.
- Hitless failover - hitless failover for inputs enables undisrupted streaming when switching from one source to another. Zixi's new hitless failover feature is based on the SMPTE 2022-7 standard, which specifies “seamless” or hitless failover between binary-identical streams with synchronized RTP headers.
- IFB Support - a monitoring and cueing system for one-way communication from the director or assistant director to on-air talent or a remote location. IFB support has been implemented in Zixi Broadcaster Pull and UDP outputs, allowing the decoder with a Zixi Receiver to send audio back to the encoder with a Zixi Feeder.
- AES stream encryption and decryption - UDP, File and RTMP input streams can be encrypted by Zixi Broadcaster using a fixed key (AES 128, AES 192, AES 256), which can be entered into the input settings or automatically generated. Zixi Broadcaster can also decrypt contribution streams using a matching key, or securely forward encrypted streams to receivers, without being able to see or analyze the traffic.
ZiXi Technology
ZiXi’s- .
- MPTS demuxing - MPTS streams can be demuxed into single SPTS input streams for specific programs.
- SCTE-35 - SCTE-35 markers found in the source input will be used to segment the stream and the #EXT-X-CUE-IN/#EXT-X-CUE-OUT tags will be added to the manifest.
- Low-latency HLS - Zixi Broadcaster supports low latency HLS delivery using chunked transfer encoding, which starts sending an HTTP response as chunks of data when they are ready before the complete response is available. Chunked transfer encoding can be use with transport stream (TS) segments and with fragmented MP4 (fMP4), which is also called Common Media Application Format (CMAF). For low latency HLS and DASH, Zixi Broadcaster must be used as an origin server.
Zixi Technology
Zixi’s transport stream protocol is a content and network-aware protocol that dynamically adjusts to varying network conditions and employs error correction techniques for error-free video streaming over IP. With minimum overhead to physical bandwidth, this dynamic mechanism provides low end-to-end latency, removes jitter, recovers and re-orders packets, smooths video delivery and regenerates video to its original form, all in real-time.
ZiXi Zixi delivers outstanding performance (at low predictable latency), superior reliability (no packet loss) and broadcast-grade video quality (SD, HD, and UHD) with no tradeoffs to delay, resolution or stutter.
Streaming from one Zixi-enabled device/server to another Zixi-enabled device/server protects the stream from quality degradations along the path. It enables the streaming of high-quality video over any distance, while overcoming the varying network conditions of the public Internet, where the amount of network errors, packet loss, jitter and out-of-order packets fluctuate "every second".
The ZiXi Zixi transport stream protocol can be also deployed on part of the path. For example, from a ZiXi Feeder to a ZiXi Broadcaster (Zixi protected path) and on to the end user through UDP or RTMP. In this case, the path that has challenging conditions (e.g. long distance or unstable wireless conditions) will be protected by ZiXi and then delivered on to the end-user on a standard UDP or RTMP protocol.
ZiXi’s Zixi’s transport stream technology includes the following features for ultimate quality and security:
- Network sensing
- Dynamic de-jitter
- MPEG specific optimizations
- Z-ARQ error recovery
- Z-FEC - Dynamic content aware forward error correction
- Active multi-path error recovery
- Adaptive bitrate over UDP, unicast or multicast
- Rate control and congestion avoidance
- 256 bit AES transport encryption
Zixi Platform Architecture
The Zixi Universe diagram shows how a Zixi embedded (ZiXi EcoZystem OEM partners) device initiates a ZiXi Zixi stream at Acquisition or how ZiXi Zixi Feeder running on an appliance or mobile device enables non-Zixi embedded devices to initiate a live stream. Zixi Feeder encapsulates the stream in the ZiXi Zixi transport protocol and delivers point to point or point to multi-point over standard IP connections. Zixi can be deployed on premise or in the cloud with the ability to monitor streams anywhere along the path. For management, processing and larger scale distribution capabilities, Zixi can support complex production workflows for live events capable of transcoding, recording, and more in a clustered environment that supports reliability and scalability.
Supported Protocols
Input:
- Zixi protected transport
- MPEG-TS over UDP and/or RTP with SMPTE-20222022 and/or RIST (TR-06-1)
- RTMP pull from CDNs and/or other sources
- RTMP push
- RTMPS
- RTSP input
- Transport stream files from local file system
Output:
- ZiXi Zixi protected transport
- MPEG-TS over UDP and/or RTP with SMPTE-2022
- RTMP and RTMPS push to CDNs and/or other media servers;
- Apple HTTP Live Streaming (HLS)
- Adobe HTTP Dynamic Streaming (HDS)
- FLV over HTTP (HTTP pseudo-streaming)
- MPEG-DASH (DASH264 profile)
- SHOUTcast
- Transport stream files to local file system
- Re-multiplex output streams to strict CBR for extensive compatibility with Integrated Receiver- Decoders (IRDs)
Transcoding Options
ZiXi Zixi Broadcaster can transcode a single input stream using multiple profiles. The transcoder supports the following options:
- Video Decoding – MPEG2, H.264/AVC, H.265/HEVC
- Video Encoding – MPEG2, H.264/AVC, H.265/HEVC
Audio Decoding – AAC, MPEG-1 Audio Layer I / II / III, MPEG-2 Audio Layer I / II / III, AC-3 (Dolby Digital)
Info For AC-3, which can contain up to six discrete channels of sound, the transcoder only supports the left and right channels and will ignore the other channels.
- Audio Encoding – AAC only, AAC only-HE (High Efficiency) and AAC-HEv2; Pass through (no encoding) – any audio codec (MPEG1/2 / AAC / AC-3, E-AC-3 (Dolby Digital Plus).
Recording Options
Live stream inputs can be stored as MPEG-TS files to a local disk drive or mounted drive.
Multicast Options
Multicast streams can be received or be sent by the ZiXi Zixi Broadcaster. ZiXi Zixi Broadcaster serves as a gateway between Unicast and Multicast streams, while allowing reliable streaming over multicast.
Adaptive Options
ZiXi Zixi Broadcaster can create an adaptive group, subsequently editing, recording, or playing it in conjunction with DASH, HLS, HDS or ZiXiZixi. You can also set a Pre-roll video/screen that will be played before the live streaming begins.
VOD Options
ZiXi Zixi Broadcaster supports VOD (Video on Demand) playback of stored files in multiple formats such as TS, MP4, HLS, FLV.
Latency Considerations
Latency defines the delay in which the video stream will be delivered to the end pointendpoint. This delay is essentially a buffer that is used for additional processing, thereby improving the quality of video stream. The latency should be considered based on the importance of immediacy. For example, if the video requires interaction (e.g. between a reporter in the field and an anchor in the studio), the latency should be set to a minimum so that the interaction does not suffer from any delay.
Latency can vary from tens of milli-seconds to several seconds.
Zixi protocol can start providing benefit from one frame (30ms), while increasing the latency will provide more robustness for the error-recovery.
In low latency (below 1500ms) the error recovery is based on hybrid approach of FEC and ARQ. FEC will add overhead of up to 30%(adaptive–without congesting the network) .
For getting sufficient error-recovery we are recommending to set the Latency at least 3 times larger than the RTT (i.e Latency >= 3* RTT)
Latency can be set to any value, we can propose two common modes:
- Interactive mode - 500ms
- Non-interactive mode – 4000ms
Latency below 1500ms will add an FEC overhead of up to 30%
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