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SDI Decoder Statistics

The following tables list the SDI 1 and SDI 2 Decoder statistics: 

Statistics & Video Decoder
Up TimeThe length of time the decoder is actively decoding (e.g., 5d22h15m25s).
RestartsThe number of times the decoder was internally restarted due to a change in encoded stream parameters (resolution and/or frame rate) or because of excessive errors in the stream.
Video Decoder

The compression algorithm detected in the decoded stream, either:

  • AVC/H.264
  • HEVC/H.265
  • MPEG2
  • Invalid (the video compression algorithm is not recognized)

The application profile class for the incoming video stream:

  • (AVC/H.264) Main, High, or Baseline
  • (HEVC/H.265) Main or High, optionally with 4:2:2 and/or 10-bit

  • (MPEG-2/H.262) Simple, Main or High


    The profiles and levels are defined in the corresponding MPEG-2/H.262, AVC/H.264 or HEVC/H.265 specifications.


The required level of decoder performance to be able to process the incoming video stream:

  • (AVC/H.264) 3, 3.2, 4, or 4.2
  • (HEVC/H.265 ) 1, 2, 2.1, 3, 3.1, 4, 4.1, 5, 5.1, 5.2, 6, 6.1 or 6.2

  • ( MPEG-2/H.262 ) Low, Main or High

The current operating status of the decoder, either:

  • INACTIVE: Decoder has not been started
  • RUNNING: Decoder is currently running with signal
  • INVALID: Decoder is currently running with no signal
Buffering ModeThe type of buffering used.
MultiSync DelayThe delay in ms from timecode stamping at the encoder to display when buffering in MultiSync mode.
MultiSync StatusAn indication of whether or not MultiSync buffering is working properly. May provide helpful information on what is missing (e.g., "Timecode is NOT PRESENT").
MultiSync Delay SetAn indication of whether or not the MultiSync delay setting is within the acceptable range. (See "MultiSync Delay Range" below)

MultiSync Delay Range

The range of values within which the MultiSync delay must lie.
(Input) Format

The input signal detected from the encoder.

BitrateThe bitrate for the decoded video.

Decoded Frames

The number of decoded video frames.


Video frames are complete pictures sent in a cascade for display at a distinct point in time. See "Decoded Frames" under "Audio Decoder & Output".

Skipped FramesThe number of frames that were not sent to the video decoder.
Video Output
(Output) Format

The output signal sent from the decoder.

Output FramesThe number of video frames output from the decoder.
Skipped FramesSkipped frames occur when the time to play a video frame has already passed when the decoder is finished producing a new video frame. In this case, the video frame is dropped (never displayed) and it is counted as skipped. The decoder does this to minimize the latency and maintain audio/video sync. The most likely reason for this to occur is that the video is complex and takes more time to decode than is expected by the decoder.
Replayed Frames

A replay frame occurs when the same video frame is played twice in a row on a decoder output. It occurs when the decoder is too slow to produce a video frame and there is nothing else to display. In this case, the decoder will replay the last frame played. Conditions such as network congestion and packet loss, complex video scenes, and the decoder attempting to minimize latency can all cause replay frames.


If the Replayed Frames statistic increments periodically and video playback is not smooth, we recommend that you try running the decoder using Fixed mode with a delay added of up to 2000ms of buffering, or less as playback quality permits. This should take care of most non-congestion related skip/replay situations.

Display ErrorsThe number of display errors.
Audio Decoder & Output

The audio compression algorithm, either:

  • AAC-LC / ADTS: decodes audio using the ISO/IEC 13818-7 MPEG-2 Part 7 AAC-LC algorithm with ADTS headers.
  • AAC-LC / LATM: decodes audio using the ISO/IEC 14496-3 MPEG-4 Part 3 AAC-LC algorithm with LOAS/LATM headers.
  • MPEG1 Layer 1/2/3 (ISO/IEC 11172-3) designated as MP1, MP2 and MP3, respectively.
  • AC-3: decodes a TS stream containing AC-3 audio formatted as per ATSC A/52.


Any AC-3 audio received will be down-mixed to a stereo pair for output on the HDMI and SDI interfaces.

The two channels of AES3 data are output within the SMPTE 272/299 embedded audio ancillary packets of the SDI HANC space.


The current operating status of the decoder, either:

BitrateThe bitrate for the decoded audio.
Sample RateThe number of audio samples per second taken from the output signal. 48 kHz only.
Number of PairsThe number of audio channel streams played as surround sound over the HDMI interface.
Input Layout 1

The stream's channel configuration as received and decoded. This statistic reports what the channel configuration was before the down-mixing and/or resampling step.

Decoded Frames

The number of decoded audio frames.


Audio frames are same-sized groups of audio samples to be played back. See "Decoded Frames" under "Statistics & Video Decoder".

Audio Output
Output Frames

The number of audio frames output.

Output Layout

The audio output layout on the SDI/HDMI interface. It is always 2.0: stereo (Front Left and Front Right).


If the Input Layout is mono, it will be mixed to stereo as the output.

Skipped FramesThe number of skipped audio frames.

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