Roll the mouse pointer over the Program monitor to reveal a Configure button at right in the title bar below the display. Click it to open the Output Configuration panel.
Tip: As for other viewports, alternatively two finger tap on a touchscreen or, if Click Viewports to Show on PGM is disabled in the Options menu, double-click the mouse on the viewport to open this panel.
The Output tab in this panel contains controls governing the system’s primary outputs.
We discussed Primary and Secondary outputs in Configuring A/V Output. The first four entries in this panel are primary outputs; typically, these are also mixed outputs, hence their default labels – MIX 1, 2, etc. These video sources are sent to the corresponding SDI output connectors (when provided), and also as NDI (Network Device Interface) outputs.
The primary outputs support the largest number of optional video sources and, uniquely, can follow a delegated M/E, or a Switcher color group. All other outputs can be assigned to follow a primary output or show another designated Switcher source (excluding M/Es).
In similar fashion, you can choose which audio source accompanies any of the primary outputs. Choose any individual audio mixer input, or any of the mixed audio outputs, Master or Aux (audio mix options vary by model).
The Format menu allows you to choose the video format for each output. Select the video format for downstream devices you intend to connect to the corresponding output here. The formats available are drawn from the list below, according to whether the session is in PAL or NTSC mode:
1080i or 1080p – depending on the session format.
480p – progressive standard definition NTSC sessions only.
480i (4:3) – interlaced standard definition NTSC sessions only.
480i (16:9) – interlaced standard definition interlaced NTSC sessions only.
576p – progressive standard definition PAL sessions.
576i (4:3) – interlaced standard definition PAL sessions.
576i (16:9) – interlaced standard definition PAL sessions.
Alpha – for remote workflows, send Alpha Channel through one of the MIX outputs.
Note: Output 1 always transmits video in session format, thus shows a Resolution display only.
Generally, source formats that are inconsistent with the current output resolution setting are automatically conformed when possible. In some cases, such as non-standard format sources, the output format may be modified to provide a suitable display. That said, it’s best to avoid non-standard sources if possible.
Last on the source format list is the Alpha Channel toggle. Any switcher output can be specified to support rendering of an alpha channel, including NDI inputs from that channel.
Recordings of the alpha outputs can be used in Adobe CC or DDR's and will retain the alpha channel that was generated. Thumbnails or captures of stills also support alpha channel.
Video Mix also support independent rotation and flip controls, as well as Section options.
The Stream controls in the Output tab let you independently assign any of the primary mixes to one or two streaming encoders. Likewise, for models with multiple audio busses, you can send audio from the Master audio mix or any of the Aux busses to one of the encoders.
The audio controls also include individual VU meters, Gain knobs, and an AGC (Automatic Gain Control) option. These allow you to modulate audio for the streams separately from your primary audio outputs.
Tip: Streaming output is always de-interlaced.
Streaming Output involves more options, too, since there are so many different ways to stream. In this panel, configure the audio and video sources sent to the streaming output. All other options and settings relevant to streaming are discussed in Stream and Encode.
APP RETURN a special output source to route and configure audio and video for supported applications with Live Call Connect. Video routing options support MIX 1-8 and audio routing corresponds to a mix minus of the Master and AUX busses, or any input.
Record and Grab Tabs
Each MIX output source has corresponding Record and Grab control groups to provide settings and options for capture. These important capabilities are discussed in full in Record, Grab and Replay. The controls shown in are detailed in Record (Grab is virtually identical, but for the lack of an Instant Replay feature).
The Genlock feature allows your system to ‘lock’ its video output to a reference video signal supplied to its Genlock input connector.
This synchronizes system video output to external equipment locked to the same reference. Genlocking is not a requirement, but it is very beneficial, and you should definitely use it if you have the capability.
Miniscule local timing differences between these may force tiny delays during switching operations, which can contribute to throughput latency. So, serving i) the Genlock input and ii) other video devices in the chain with a single reference is the recommended approach.
You could think of it this way:
Genlocking your cameras has the effect of locking their output together, ensuring optimal synchronization for live switching. This may result in throughput latency benefits.
Supplying the same sync source to the Genlock input ensures a match between the system’s video output and any downstream video devices required to handle both it and other (genlocked) sources.
Note: Digital audio is less tolerant in certain respects than analog. Some devices require SDI sources to be genlocked when mixing digital audio (whether for recording or live production).
Vizrt systems include dynamic audio re-sampling for requirement. So genlocking SDI audio/video sources is not a requirement. Still, genlocking sources and other production devices to a single house reference signal, or genlocking the cameras directly to the Vizrt live production system's output is encouraged (to genlock cameras, see your camera manual).
Tip: The term “genlock” refers to “generator locking”. Professional video devices often provide a “genlock input”, which allows an external reference signal (often referred to as ‘house sync’) to control its video timing.
The output of video devices connected in this manner is synchronized to the reference signal, and they are referred to as ‘genlocked’.
The ‘bi-level’ reference signal long used for standard definition television is often used for genlocking both SD and HD installations. However, the HD (Tri-level) reference sources are also supported by the Reference Type settings option.
Note: Reference Type options do not appear for SD sessions.
This setting is applied when a genlock reference signal is not in use. To adjust the setting, supply color bars to an input and pass video output to a downstream vectorscope. The vectorscope display is completely stable when Center Frequency is properly adjusted.