2018-05-18
Page 13
IncodeX One Point-to-Point
Broadcasting Solution
control the encoding quality of your video stream, but it is better suited for encoding video that does not contain a
lot of movement to prevent an overly large data stream.
►
“VBR” (Variable Bit Rate) Encoding and “Video Burst Size”
Alternatively, you may choose “VBR” or variable bit rate encoding by clicking on the lefthand side of the “Rate
Control” selector. VBR automatically adjusts your selected video bit rate during encoding, using higher bit rates
during times of high motion within your incoming video signal while encoding the lower movement portions at
lower video bit rates. Your selected video bit rate is treated by the IncodeX One as a target that the adjusted bit
rates end up averaging over a period of time. VBR encoding for high motion video results in a data stream that
is overall smaller in size and requires less bandwidth than if the video had been encoded at a constant bit rate.
To prevent your IncodeX One from sending a data stream larger than your network can handle during encoding
at the higher VBR bit rates, use the “Video Burst Size” drop down box to limit the amount of bits sent during the
selected number of milliseconds.
NOTE:
The “Video Burst Size” only pertains to variable bit rate encoding and is hidden in “CBR” mode.
• “Video Resolution”
Specify the size and pixel density of your video stream’s picture with the “Video Resolution” drop down box. By
default, the IncodeX One is set to “Follow Input,” which encodes your video stream at the same resolution as the
video signal going into your IncodeX One’s video input. Alternatively, you may choose 480i (720x480) for a standard
definition video quality at a 4:3 aspect ratio or one of the high definition video resolutions (720p [1280x720] or 1080i
[1920x1080]) with aspect ratios of 16:9.
•
“Video Profile”
The IncodeX One interface also gives you the ability to choose your H.264 encoding compression cababilities with
the “Video Profile” drop down box. The “Baseline” profile uses the fewest compression features while the “High”
profile offers the highest quality video stream requiring the least amount of bandwidth. However, more features mean
more complex encoding and decoding is required for the higher level profiles. When choosing an H.264 profile, the
main thing to consider is the devices your viewers will be using to decode your stream. The decoders provided with
IncodeX One Point-to-Point solutions support the “High” profile, so LEIGHTRONIX recommends this setting for use
with the included decoders. Many mobile devices and older and/or less powerful computers are only able to decode
streams encoded with the “Baseline” profile.
• “GOP Size”
When choosing the GOP or group of pictures size from the “GOP Size” drop down, you are telling the IncodeX One
how many partial picture frames you want between full picture frames. A full, starting frame, known as an I-frame,
contains all of the data needed to display that particular point in the video stream. The remaining frames in the GOP
only contain data that differs from the I-frame while reusing the I-frame data that doesn’t change. Choosing a larger
GOP will result in some compression of stream size as less of the same information is repeated in the stream. As a
trade off, though, your video stream may play back less smoothly if your network connection has issues or the stream
becomes corrrupted and your decoder has to search further into the video stream for I-frame reference points.
• “Frame Decimation”
The “Frame Decimation” drop down allows you to reduce the number of frames per second (fps) in your incoming
video signal. Either choose “None” to leave the frame rate as is or reduce by one half, one third, or one fourth. Re-
ducing the frame rate results in higher quality images, but the stream display may be jerky, especially in the case of
high motion video.
• “Audio Delay (ms)”/“Video Delay (ms)”
The audio and video delay fields allow you to enter the number of milliseconds you want the IncodeX One to wait
before beginning to encode your incoming audio and/or video. These settings allow you to compensate for any audio/
video sync issues in your source signal.
• “D1 Sharpness”
If you chose a composite video source for encoding, the “D1 Sharpness” drop down box will be displayed in the
“Advanced Controls” panel. Use this setting to increase the crispness of the edges in the incoming video signal for
a more focused look, with the option to increase sharpness by factors of .5, 1, or 2. Leaving the option set to 0 will
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