The ZiXi Zixi Broadcaster is the central component in the ZiXi Zixi Video Network. ZiXi Zixi Broadcaster takes video streams from ZiXi 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 Zixi Broadcaster is an intelligent and versatile video distribution component that may reside on premise at a customers site or is offered by ZiXi Zixi as a cloud service.
ZiXi Zixi Broadcaster offers the following features:
- Robust content delivery over IP - communicates with ZiXi Zixi Feeder and ZiXi 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
- 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)
- 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.
- 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 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.
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- 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 stream at Acquisition or how 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 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-2022
- RTMP pull from CDNs and/or other sources
- RTMP push
- RTMPS
- RTSP input
- Transport stream files from local file system
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- ZiXi protected transport
- MPEG-TS over UDP and/or RTP with SMPTE-2022
- RTMP 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 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- MPEG1 layer 1 Audio Layer I / 2, AACII / III, MPEG-2 Audio Layer I / II / III
- Audio Encoding – AAC only, AAC only; Pass through – any audio codec (MPEG1/2 / AAC / AC-3)
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 Broadcaster. ZiXi Broadcaster serves as a gateway between Unicast and Multicast streams, while allowing reliable streaming over multicast.
Adaptive Options
ZiXi Broadcaster can create an adaptive group, subsequently editing, recording, or playing it in conjunction with DASH, HLS, HDS or ZiXi. You can also set a Pre-roll video/screen that will be played before the live streaming begins.
VOD Options
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 point. 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.
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Latency below 1500ms will add an FEC overhead of up to 30%