videnc

Displays encoder video status information. You can specify to display the configuration (config), stats, or all.

Tip

To display a summary of all the encoders in a table format, you can use videnc all get table.

(SDI Dual-BNC only) The Video Input port for the encoder:

• BNC1
• BNC2

Timecodes are used to mark video frames, mainly for editing purposes. This field either disables timecoding, or selects the source to “timecode” the encoded video frame. The following selections are available:

• None: No time code will be inserted in the video stream (saves bandwidth if not required).
• Video: (SDI only) The timecode will be extracted from the incoming video signal.
• System: If no timecode is included in the video feed, the encoded timecode is based on the encoder’s system clock. In this case, it is a good idea to enable NTP (see Configuring Network Settings).

Note

See TimeCode Source for currently supported TimeCode features.

Specifies the aspect ratio of the video source and signals it into the MPEG stream:

• Auto: Aspect ratio is derived from the incoming video source resolution.
• 3:2, 4:3, 5:3, 5:4, 16:9, 16:10, 17:9: Forces aspect ratio to specified value.
• WSS/AFD: Extracts aspect ratio from incoming video source based on WSS (Wide Screen Signaling) or AFD (Active Format Description) if detected.

Note

WSS is only supported with analog PAL video; AFD is only supported with SDSDI video.

By default, input is scaled to the output resolution.

• Scale: Input is scaled to output resolution.
• Crop: This setting crops the input and encodes to a rectangle within the input image (at the center of the image) while discarding the rest of the input image. The output resolution is the portion of the input that is encoded from the center. This may be done instead of downscaling.

Note

Cropping is disabled if resolution is set to Auto, 960, or 1440, or if (output) resolution is set to equal or larger than the input resolution.

The Group of Pictures size for the encoded video.Range: 1-1000

Note

For intra-refresh mode, the GOP size is the number of frames between the sequence and picture parameter set NAL transmission.

The GOP structure for the encoded video: (See “Framing” in Video Encoder Settings)

• I: I frames only (lowest delay; lowest quality)
• IP: I and P frames only
• IBP: I, B and P frames (H.264 only)
• IBBP: I, BB (two B frames in sequence) and P frames (highest delay; highest quality) (H.264 only)

Note

B frames require a Main Profile decoder.

B frames provide more quality as the encoding is more efficient; thus more details can be rendered in the same bandwidth/bitrate.

Tip

When B frames are used, the GOP may be rounded up to make the sequence end with a P frame.

Select the compression scheme:

• CAVLC: Context-adaptive Variable-length Coding is a lower-complexity alternative to CABAC. CAVLC produces lower quality, but is easier to decode.
• CABAC: Context-adaptive Binary Arithmetic Coding is an algorithm to losslessly compress syntax elements in the video stream. CABAC compresses data more efficiently than CAVLC and should produce better quality, but requires considerably more processing to decode.

Note

The H.264 decoder must be Main Profile compliant or higher to decode a CABAC video stream.

Tip

Generally, you get better visual quality if you are using CABAC because it is more efficient.

Enables (on) or disables (off) Intra-Picture SubPartitioning. Intra-Partitioning is a setting that allows the use of a sub-macroblock partition called the “Intra8x8 block” with all the intra-prediction modes associated with it.

Note

Intra-Partitioning requires that the H.264 decoder be High Profile compliant.

Generally, you get better visual quality if you enable Intra-Partitioning because it gives the video encoder better coding tools.

Tip

Noisy Matrix completion is enabled automatically when Partitioning is enabled and video bitrate is under 800 Kbps. Noisy Matrix completion enhances video image “noise” reduction to improve video quality at lower bitrates and make blocky artifacts less visible.

Enables (on) or disables (off) Intra-refresh video encoding support. Intra-refresh is a video encoding mode of operation in which no distinct IDR frame is sent in the video elementary stream. Instead, the macro-blocks that make up the IDR frame are sent gradually within a certain time so that the entire video reference frame is re-built (at the decoder) within the number of frames specified by the refreshrate parameter. Intrarefresh minimizes latency, smooths the video bitrate, and minimizes GOP pulsing artifacts.

Tip

Intra-refresh requires that the decoder and streams be started first.

Specifies the number of frames over which the entire picture is refreshed. Range: 1-5000

Note

If the refresh rate is set too low, a left-to-right wave-like artifact may result.

This parameter enables Closed Captioning on the encoder stream. Off, On

Note

For more information, see Closed Captioning.

• WUXGA, 1900x1200
• UXGA, 1600x1200
• WSXGA, 1680x1050
• HD+, 1600x900
• SXGA+, 1400x1050
• WXGA+, 1440x900
  1360x768
• SXGA, 1280x1024
• WXGA, 1280x768
• XGA, 1024x768
• SVGA, 800x600
• VGA, 640x480

Note

See Video Encoding.