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SDI Decoder Settings

The following sections list the SDI 1 and SDI 2 decoder settings:

Primary Stream(None)Select the primary input stream from the dropdown list of the stream(s) you have configured or “SAP Discovered” streams (if SAP listening is enabled). See Setting Up Decoder Streams.
Secondary Stream(None)(Optional) Select an alternate (secondary) stream for the decoder channel.
NameN/A(Read-only) The Name of the selected primary input stream.
ProtocolN/A(Read-only) The encapsulation Protocol for the stream, e.g., TS over SRT.
TypeN/A(Read-only) The stream Type, e.g., Unicast or Multicast.
ResolutionN/A(Read-only) The input signal detected from the incoming video stream. It includes the number of pixels per line, and whether the video is interlaced or progressively scanned (indicated by i or p).
Frame RateN/A(Read-only) The frame rate per second of the incoming video stream.
AudioN/A(Read-only) The sampling rate of the incoming audio signal.

Enable Buffering


Check or clear this checkbox to enable or disable buffering (see "Mode" below).


When buffering is disabled, the decoded picture buffer is passed to the output interface with no buffering to compensate for stream jitter. This is the lowest latency mode, but may have noticeable skip and replay artifacts.



("Enable Buffering" must be checked) The type of buffering to use. A jitter buffer temporarily stores arriving packets in order to remove the effects of jitter from the decoded stream.

  • Automatic: Automatic mode favors smooth playing content with good synchronization between audio and video. The incoming stream is monitored and the optimal required delay is determined so that stream packet and video picture jitter is absorbed. The calculated delay may change slowly as network and video conditions change.


    The added delay will not decrease with time even if the video jitter disappears.

    The added delay depends on the monitored video jitter. It also depends on the audio arrival time; if the audio is late, this delay will be added to the current calculated delay. For example, if the audio is late by 500 ms (vs Video), an additional 500 ms delay will be added to allow the Audio/Video synchronization.

  • Fixed: Fixed mode allows users to specify a delay to be added to the decode pipeline after the content is decoded. The amount of delay does not vary and artifacts may result if a too low value is used. (See "Delay" below.)


    The decoder has a minimum buffer set based on the resolution and frame-rate of the stream content. In addition, users can add more delay if desired: (1) to achieve a specific decoding latency for inter-channel synchronization purposes; (2) to deal with unusually large amounts of jitter in the stream; or (3) to allow A/V sync to occur when the stream content is highly out of sync.
  • Adaptive Low-Latency: The decoder measures the stream packet and video picture jitter and adds in a delay so that artifacts are minimized while also minimizing video latency. Provides backward compatibility with older decoder versions.


    Audio artifacts may occur if audio is streamed after video when using Adaptive Low Latency.

    This mode does not consider the audio arrival time. If the audio is late by 500 ms, the audio /video will be unsynchronized by at least 500 ms. In theory the audio should play smoothly as long as there is not significant jitter. If the audio jitter is over 40 ms, audio artifacts will be noticeable.

  • MultiSync: Use to synchronize the content across multiple channels to within one frame period. This is designed to allow down-stream equipment to switch smoothly between video and audio sources. You need to set the "MultiSync Delay" on all of the decoder channels to the same value. For the steps to configure multi-channel sync on the Makito X encoder and decoder, see Multi-channel Synchronization.


0 ms

("Enable Buffering" must be checked and "Mode" must be Fixed) The delay in ms when using buffering in Fixed mode. Range = 0…2000 ms


The maximum delay is 2000 ms. If for any reason the system requires more than this value to play smoothly, video or audio artifacts will be noticed.

MultiSync Delay

1000 ms

("Enable Buffering" must be checked and "Mode" must be MultiSync) The delay in ms required to ensure that two or more decoder channels are synchronized. Range = 0…10000 ms


The difference in the values between the decoder channels cannot exceed 2000 ms.

Output ResolutionAutomatic

The dimensions of the frames (width and height) to send to the display with an indicator (i or p) whether the video is interlaced or progressively scanned.

  • Automatic: Allows the decoder to choose a suitable display format based on the stream parameters and the connected display's capabilities.


    Attempts to up/down-scale incoming video that is not supported to a nearest or best matching supported resolution.
  • Native: The display format chosen is always the same as stream's encoded format regardless of the connected display’s capabilities. If the stream's encoded format is supported as a display format, the display shows video in that format. Otherwise, no video is displayed. Statistics show the format in which the video is encoded.

  • TV Resolutions: 1920x1080p…720x480i
  • Computer Resolutions: 1920x1200… 640x480
Output Frame RateAutomatic

The frame rate per second generated for the displays:

  • Automatic: The decoder will select the best display frame rate based on the stream parameters and the connected display's capabilities.
  • 75, 60, 59, 50, 30, 29, 25, 24 or 23


If Automatic is selected, the actual frame rate generated will be the next highest valid frame rate supported by the SDI and HDMI interface, plus the one that gives the best decimation factor. For example, 30 Hz could be chosen instead of 29.970 Hz.
Still ImageFreeze

The type of static image to display when the decoder is not receiving a video stream.

  • Freeze: continues to display the last decoded video frame.
  • Black Screen: displays a black screen.
  • Blue Screen: displays a blue screen.
  • Color Bars: displays a series of vertical color bars across the width of the display.
  • Mute: disables the video output.
  • Select Image: opens the Still Images selection dialog for you to select a custom still image. Images must be uploaded by an administrative user. Custom still images are not supported for HEVC streams; instead the Freeze still image will apply. For details, see Configuring Still Image Streaming.


When the still image is substituted on the display outputs, the video frame rate and resolution will be maintained.
Still Image Delay3The delay in seconds before the still image is displayed. Range = 1…1000 seconds

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