Streambox Chroma Manuel utilisateur
HD/UHD/4K Rackmount
Encoder and Decoder
User Manual
August 2019 v0.3 LN/DB
1 About Streambox Chroma
The Streambox® Chroma Encoder/Decoder is a rack-mountable Audio/Video Encoder and Decoder solution for
secure, low-latency video transport that is required for studio and post-production workflows, video backhaul,
or multi-campus video distribution. The Encoder and Decoder applications run on a Linux operating system
and support optional AES 128-bit encryption (and AES 256-bit encryption with restrictions), LDMP multipath
transport, and ACT-L5 and -L3 Advanced Profile compression, all together providing a secure, high quality
video transport with low latency and wide color fidelity.
With optional hardware and software upgrades, Chroma can utilize such features as 4:4:4 12-bit Color depth,
Rec.709, Rec.2020, DCI-P3, XYZ and RGB color spaces, and 2K/4K video, with support for HDR and HFR video,
as well as up to 16 channels of PCM audio.
Codecs
Chroma utilizes two proprietary video codecs, ACT-L3 and ACT-L5.
Streambox’s ACT-L3 codec, an advanced video compression technology optimized for interlaced and
progressive video and display systems, which ensures compatibility with other Streambox products including
Standard Definition (SD) products. Chroma also offers Streambox ACT-L5 codec that allows the streaming of
much higher quality video than is available on other platforms. Both codecs provide higher quality in 4K, UHD,
2K, HD and SD, at a much lower data rate than MPEG and H.264 compression. Both codecs are adaptable to
user-selectable data rate requirements with constant bit rate and variable bit rate modes.
The robust family of Streambox video transport solutions features innovative error correction and bandwidth
shaping technologies which manage, control, and mitigate packet loss and correct irregularities common to
video delivery over packet-based networks.
2 Solution Features
ACT-L3/L5 Codec for Superior Video Quality and Delivery
✔Standard Definition, High Definition, 2K, UDH, 4K, and even 3D (synchronized two-channel HD video)
are supported
✔High-quality, 12-bit RGB 4:4:4, or 8/10-bit 4:2:2 video over public and private IP networks
1
✔Low Delay Multi-path Protocol (LDMP) reliable video transport
✔0.5 to 2 second end-to-end latency over IP networks
✔Scalable bitrates from 2 up to 120 Mbps with near lossless quality
✔Adaptive bitrate encoding / decoding
✔Up to 8-channel synchronized video (option)
Security for Protection of Content
✔A protective shield around the transport of valuable media content
✔One-to-one or one-to-many encrypted collaboration via private network or Streambox Cloud Services
✔Optimized ACT-L3/L5 codec adds security
✔End-to-end AES 128-bit video encryption (optional)
✔AES 256-bit encryption is available with added restrictions (optional)
✔Encryption with no increase in stream latency
✔Playout on proprietary software and hardware Media Players
Simplified Workflows and Playout
✔Workflow support from capture to playback with either a hardware Decoder or media player
✔Integration with Streambox Enterprise Server and Cloud Service for video routing of live streams
✔Supports file-based streaming from Streambox Enterprise Server or Cloud Services to Decoder or
media player
✔Stream high quality live video over local networks, Internet connections, and MPLS networks
✔Securely share video streams with 3rd-party providers or stakeholders with Streambox Sessions™
Upgrade Options
✔4, 8, 16-channel uncompressed PCM audio support
✔AES 128-bit or 256-bit encryption
✔12G-SDI with 12-Bit, 4:4:4 RGB
✔2, 4, and 8-Channel synchronized video
✔DolbyVision
✔Extended service and support
1 requires 12G-SDI option
3 Specifications
Hardware
●Size: 1 Rack Unit: W48.2cm x D28.2cm x H44.0cm (19in x 11in x 1.7in)
●Weight: 4.7kg (10.5lbs)
●Power: 100-240 VAC, 160 W
●2x 1000Mbps RJ-45 Ethernet ports
●HDMI Monitor Output (for terminal access)
●USB Connections (for terminal access)
●Encoder/Decoder half-duplex (standard). Encoder-only, Decoder-only, and Encoder/Decoder
Full-Duplex models available
Video Interface
●Video IN/OUT: BNC 12G, 6G, 3G or HD-SDI (support varies with model), 12-bit HD with up to 16-ch
embedded SDI audio
●Color: RGB, YUV 4:4:4* in 2K/4K modes, 4:2:2 and 4:2:0 Rec.709 in all modes
●Bit Depth: 12*, 10, 8
●Options to add HDMI Video in/out
●HDMI 2.0a with Rec.2020, HDR-10 Metadata support on Decoder (optional)
●REFERENCE: BNC Tri-sync (HD only)
●8-Channel Decoder**
Audio Interface
●SDI Embedded Audio IN/OUT
●Audio Codec: Up to 8-ch PCM and AAC, CELP, GSM frequency up to 48 KHz, 5.1 surround sound; 16-ch
PCM*
* (optional 12G-SDI hardware required)
** (optional Quad 2 Blackmagic Decklink video card required)
Supported Encoder Video Inputs
Input Resolutions
Input Frame rates (fps)
HD
SD NTSC and PAL
HD 720p, 1080i, 1080p,
1080psf
SD: 29.97 (NTSC); 25 (PAL)
HD: 50, 59.94 (720p, 1080i), 23.98, 24,
25, 29.97, 30 (1080p); 23.98, 24
(1080psf)
2K
2K DCI (2048x1080)
23.98, 24 (2K DCI)
UHD*
UHD (3840 x 2160)
Option available: 3D (2x
HD) 1080p, 1080psf
23.98, 23.98psf, 24 (3D)
23.98, 24, 25, 29.97, 30 (UHD)
4K**
4K DCI (4096 x 2160)
23.98, 24 (4K DCI)
50, 59.94, 60 (UHD)
* In addition to all HD and SD resolutions
** In addition to all UHD, HD, and SD resolutions
Supported Decoder Video Outputs
Output Resolutions
Output Frame rates (fps)
HD#
SD NTSC and PAL
HD 720p, 1080i, 1080p,
1080psf
SD: 29.97 (NTSC); 25 (PAL)
HD: 50, 59.94 (720p, 1080i), 23.98, 24,
25, 29.97, 30 (1080p); 23.98, 24
(1080psf)
2K
2K DCI (2048x1080)
23.98, 24 (2K DCI)
UHD*
UHD (3840 x 2160)
Option available: 3D (2x
HD) 1080p, 1080psf
23.98, 23.98psf, 24 (3D)
23.98, 24, 25, 29.97, 30 (UHD)
4K**
4K DCI (4096 x 2160)
23.98, 24 (4K DCI)
50, 59.94, 60 (UHD)
# Can force an HD standard of your choice, upconverting from SD if necessary
* In addition to all HD and SD resolutions
** In addition to all UHD, HD, and SD resolutions
4 Hardware
Streambox Chroma is available in 3 main models: HD, UHD, and 4K, with some additional upgraded versions
such as the 12G-SDI version, available. Furthermore, each of the 3 models is available in an Encoder version
and a Decoder-only version. The Encoder versions can be switched into Decoder mode, in a half-duplex
fashion: the unit can be anEncoder or a Decoder, but not both at the same time.
Front Panel
Rear Panel
Rear Panel, 12G-SDI (optional for UHD, 4K models)
5 Encoder Web Administration
In addition to the standard console interface, the Streambox Encoder may also be equipped with a web
management feature. This allows the Encoder to be easily controlled using a web browser on any computer
with network access to the unit. The web interface uses advanced html which allows dynamic updates of the
web interface so that information is updated without having to refresh the page. The web interface can be
accessed by entering the IP address of the Streambox Encoder into a web browser .
5.1 Login Page
When first connecting to the web interface of the Streambox ACT-L3/L5 Encoder or Decoder you are
prompted for the Username and Password to access the interface. This username and password is specific to
the web interface and is not shared by the console or RDP interfaces. The login and password are
case-sensitive. The default credentials are:
Username: administrator
Password: demo
Figure 1 Encoder Web UI Login Page
5.2 Title Bar
The title bar contains the Streambox logo, product information, and important information about the
Streambox stream.
5.3 Info Page
The Info page is the main interface for Streambox Chroma Encoder and provides an instant view of the current
video and network settings.
Figure 2: Encoder Web UI Info Page
Video
The video section shows a scaled down preview of the video input to assist in verifying the video input signal.
Preview Update: With these buttons, you can select the frequency with which the picture will be updated.
Spot
will load a single frame about every 30 seconds, while Low
, Med,
and High
will load frames at respective
speeds; Preview Update provides feedback of what is being streamed and does not represent the full quality
of the video stream.
Source Video Format: displays the resolution, progressive/interlaced, and the framerate of the source video,
as detected by the Encoder.
Video Resolution: the video stream’s intended resolution, which may be a fraction of the source resolution.
Color Profile: the color capture profile
Bitrate: the total overall transfer rate of the ACT-L3/L5 stream, including all video, audio, FEC, and ancillary
data
Quality: the current and average compression quality metric for the encoded frames; 0 is highest quality (no
compression) and 300 is the lowest quality (highest compression)
Dropped Capture Frames: number of video frames dropped by the capture process; typically due to a problem
with video input (cumulative)
Dropped Encoder Frames: number of video frames dropped by the Encoder software engine; typically due to
the “prefer quality over framerate” setting or a problem with the Encoder settings (cumulative)
NOTE: Even in a perfect stream, it’s normal for this to drop several dozen or hundred packets at the
start of an LDMP stream.
Frame Delay: The number of frames buffered in the capture process
Frame Rate: The frame rate setting of the encoded stream
Network
Encoder IP: IP address that the Encoder is using to send data from (source address)
Decoder IP: IP address that the Encoder is using to send data to (destination address)
Packet Size (MTU): IP Packet size (default = 1392)
Shuffle: Forward Error Correction Shuffle setting
Buffer: the amount of network buffer available; this will vary based on the complexity of the video and
limitations in the network connection; a negative value indicates a failed network connection
Bytes: size of the buffer in bytes
Packets Sent: number of total packets sent since last restart
Transmission: Indicates LDMP or UDP network mode.
Streaming
This region includes a start/stop button for the stream.
5.4 Network Page
The network page allows access to the network settings such as bitrate, latency, and Decoder IP.
Figure 3 Encoder Web UI Network Page
For basic functionality of the system upon initial set up, two settings need to be set: the Decoder IP address
and target bitrate.
Bitrate and Buffer Settings
Target Bitrate: sets the total transfer rate that will not be exceeded when streaming
VBR Buffer: Variable bitrate buffer in seconds; amount of time in seconds that the Encoder has to process the
video before it is to be transported to the Decoder; values 0.1s to 5s; A lower setting decreases latency while a
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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