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Niagara B264 Standalone Encoder Manual

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o HD 1080i inputs can be scaled to 1280×720p at the same incoming frame rate
(e.g., 1080i59.94 will be scaled to 720p29.94; 1080i50 will be scaled to 720p25)
o HD 1080i inputs can be scaled to ¼ resolution (960×540), with the same
incoming frame rate
o SD inputs can be horizontally cropped to 704 pixels or horizontally scaled to 640
pixels
o SD inputs can be horizontally scaled to 640 or 528 pixels, and converted to
progressive frame rates (29.97p for NTSC inputs, 25p for PAL inputs)
If Video Input Settings is set to Auto Detected, the following options are offered in this
parameter:
o Same as Input: the encoder will produce a signal that has the same resolution and
frame rate as the input (no scaling).
o Scale 3/4 Horizontal: the encoder will scale down the image horizontally by 3/4.
The frame rate will not be changed.
o Scale to 640×360p: the encoder will scale the input video to 640×360. The frame
rate will be the same as the input, but interlaced inputs will be de-interlaced (for
example, 1920×1080i60 will yield 640×360p30). This resolution is not available
for 1920×1080p inputs at any frame rates; the encoder will fall back to 3/4
horizontal scaling in this case.
o Scale to 480×270p, Scale to 320×240p, Scale to 320×180p: the encoder will
scale the input video to the selected resolutions. Interlaced inputs will be de-
interlaced as described above. Progressive inputs will be encoded at half frame
rate. This resolution is not available for 1920×1080p inputs at any frame rates;
the encoder will fall back to 3/4 horizontal scaling in this case.
Video Rate Mode: This controls whether the video elementary stream is CBR or VBR.
The video bit rate setting varies according to this selection, as shown below.
Bit Rate Selection: This field is shown only if the encoder is set to CBR mode, and
allows the user to specify either the video bit rate, or the transport bit rate. The transport
bit rate includes audio, video, tables, NULL packets, and various overheads. In some
situations, such as for example, RF links of fixed capacity, it is more convenient to
specify the transport rate (i.e., the final bit rate “in the wire”), and let the encoder
compute the corresponding video bit rate to yield the desired transport rate. In other
situations, such as IPTV deployments, it is more convenient to simply specify the video
bit rate and let the encoder compute the final transport rate. Note that this control is not
available in the OTT protocol modes. The controls displayed vary according to this
selection:
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