Science Image FLOW 4K – Up/Down/Cross Converter & Fiber Transmitter/Receiver


Incredibly versatile video signal converter with up, down and cross conversion to and from 12G-SDI and HDMI2.0, as well as fiber optic 12G-SDI input and output

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The FLOW 4K from Science Image is a highly versatile signal converter and optical video receiver and transmitter, all in one compact device.

The FLOW 4K converts 1 channel of 12G-SDI or HDMI 2.0 4K60 and below video sources into any format specified by the user in the range of HD to 4K60, and output through the 12G-SDI or HDMI 2.0 ports.

The Up/Down/Cross conversion function currently supports at least 35 types SMPTE and PAL/NTSC standard formats, with more formats available in the future by way of firmware updates.

To quickly view the device’s settings, a convenient 1.3-inch OLED screen displays the unit’s working status and parameters, input/output format and other content in real time.

The FLOW 4K has built-in HDMI 2.0 and 12G-SDI optical transceivers for sending and receiving video signals over long distances. Users can choose different optical modules to transmit different distances, with the maximum support of 20 kilometers.

SDI Video Format

SDI video format
1.5G/3G-SDI HD video format720p50,  720p59.94,  720p60,  1080i50,  1080i59.94, 1080i60, 1080p23.98,  1080p24,  1080p25,  1080p29.97,  1080p30,  1080PsF23.98,  1080PsF24,  1080PsF25,  1080PsF29.97,  1080PsF30,  2K DCI 23.98p,  2K DCI 24p,  2K DCI 25p, 1080p50, 1080p59.94, 1080p60
6G/12G-SDI/Ultra HD /4K video format2160p23.98, 2160p24, 2160p25, 2160p29.97, 2160p30, 2160p50, 2160p59.94, 2160p60
SDI specificationSMPTE 259M, SMPTE 292M, SMPTE 296M, SMPTE 372M, SMPTE 424M, SMPTE 425M, SMPTE 2081-1, SMPTE 2081-10, SMPTE 2082-1 and SMPTE 2082-10

HDMI Video Format

HD video format720p50,  720p59.94,  720p60,  1080i50,  1080i59.94,  1080i60, 1080p23.98, 1080p24,  1080p25,  1080p29.97,  1080p30, 1080PsF23.98,  1080PsF24,  1080PsF25, 1080PsF29.97,  1080PsF30, 2K DCI 23.98p, 2K DCI 24p,  2K DCI 25p, 1080p50,  1080p59.94,  1080p60
4K video format2160p23.98, 2160p24, 2160p25, 2160p29.97, 2160p30, 2160p50, 2160p59.94, 2160p60
SDI video sampling4:2:2 and 4:4:4
SDI audio sampling rateTV standard 48kHz
SDI color accuracy4:2:2 and 4:4:4
SDI color spaceREC 709     BT2020
HDMI color spaceREC 709     BT2020
HDMI color accuracyYUV 4:2:2 and RGB 4:4:4

Format Conversions


SDI video input1 x 1.5G/3G/6G/12G-SDI, adaptive input, automatic switching
SDI video output1 x  1.5G/3G/6G/12G-SDI, adaptive output, automatic switching
HDMI video input1 x HDMI 2.0 Type A interface supports up to HDMI 4K60p input, backward compatible
HDMI video output1 x HDMI 2.0 Type A interface supports maximum HDMI 4K60p output, backward compatible
Optical fiber input and output (Optical transceiver function temporarily closed)1 x SMPTE optical fiber SFP socket, used to connect different types of Gigabit/10 Gigabit/12G-SDI optical fiber modules
RJ45 Gigabit Ethernet port1 x RJ45 Gigabit Ethernet interface
LINE IN audio input port1 x LINE IN 3.5mm audio input port for external analog audio embedding
MIC input and output port1 x Mic 3.5mm audio input and output port


1.3 inch OLED screen1 x 1.3-inch OLED screen, real-time display of NDI box encoding/decoding status, input/output format and IP and other information, clear at a glance, easy to operate.


size125mm x 115mm x 24mm
materialall aviation aluminum milling

Power supply
Two power supply modes5-18V DC power input and POE
Power consumption10W
Operating temperature5°C to 40°C
Storage temperature-20° to 60° C (-4° to 140° F)
Relative humidity0% to 90% non-condensing


Packing ListFLOW 4K

quick start manual

12V universal power supply (includes four sets of international conversion plugs)

Warranty1 year limited manufacturer’s warranty

Additional information

Weight3 lbs
Dimensions8 × 6 × 4 in