7. Select the type of bit rate control from the Rate Control drop-down list. Options are:
• VBR (variable bit rate) — Produces a better quality-to-space ratio compared to a
CBR file of the same data because it includes more bits for complex segments of
the AV stream and fewer bits for simpler segments. However, it is difficult to predict
the size of the resulting file.
• CBR (constant bit rate) — Creates a file of predictable size and stream rate, but of
variable quality depending on the complexity and motion content of the video.
• VCBR (constrained variable bit rate) — Limits the maximum bit rate and sometimes
the buffer size to create a stream of the best possible quality within a specified
(constrained) bit rate compression limit similar to VBR.
8. Select an encoding compression level from the H.264 Encoding Profile
drop-down list.
• High — Offers a higher level of compression and better quality for the selected bit
rate but is more processor intensive to decode.
• Baseline — Offer the lowest compression level and is less processor intensive to
decode.
• Main — Offers mid-range compression and performance.
9. Select an encoding profile level from the Profile Level drop-down list (part of figure
62, shown below). This sets the upper limits of resolution, bit rate,and frame size.
Settings are from 3.0 (for lower limits) to 4.1 (for higher limits).
10. Configure audio encoding (in the Audio Encoding panel of the Archive Encoder
column):
• Select the audio bit rate from the Audio Bitrate drop-down list. The SMP
supports rates of 80, 96, 128, 192, 256, and 320 bits per second (bps) for stereo
audio.
• Select the audio channel (A, B, or dual channel) to use from the Channel
Selection drop-down list.
• If desired, set a delay period for the audio to follow video. Type the number of
miliseconds (from 0 to 999) into the Audio Delay field or click the Up and Down
arrows to adjust the period.
NOTE: The confidence encoding stream uses the same audio encoding settings as
the archive encoding stream.
SMP351 • Web-Based User Interface 96
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