videnc

The Video Input port for the encoder:

• BNC1

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 timecode 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 (under Network Settings).

(timecode must be System with SMPTE12M-1 specified for countmode) Enables or disables timecode daily resyncs. Values are On, or Off. 

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.
• 1:2, 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.

(resolution cannot be set to Auto and must be less than the Input Format detected) Select whether to scale or crop the input to the desired resolution. See "Resizing" (under Video Encoder Settings).

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 (i.e., video compression mode) for the encoded video: (See “Framing” under Video Encoder Settings)

• I: I frames only (lowest delay; lowest quality)
• IP: I and P frames only
• IBP: I, B and P frames
• IBBP: I, BB (two B frames in sequence) and P frames (highest delay; highest quality)
• IBBBP: I, BBB (three B frames in sequence) and P frames
• IBBBBP: I, BBBBB (four B frames in sequence) and P frames (highest delay; highest quality)

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.

Configures the encoder to use multiple slices per frame instead of the normal 1 slice per frame encoder configuration. Encoding latency is improved since encoded slices can be transmitted on the network without having to wait for the whole frame to be encoded. 1..11

Setting the number of slices to 2 or higher will automatically enable slice-based video capture and encoding, resulting in even lower end-to-end latency. Streams with multiple slices will remain compliant with H.264 and H.265 standards, and will still be compatible with standard receivers and decoders. 

Note

Latency improvements are only seen on decoders that do not buffer entire video frames before decoding and can actually decode and output slices.

Multiple slices cannot be used in conjunction with skipframes or gopstructure, i.e., Framing containing B-frames (IBP, .... IBBBBP).

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

(Rate Control must be VBR) Enter the maximum video bitrate for the encoder: 0..120000 (0 is Auto configure). 

Note

maxbitrate should be greater than or equal to bitrate.