User Manual v.2
QVidium
®
QVENC4K™ UHD/HEVC Video Encoder
Copyright 2023 QVidium
®
Technologies, Inc.
Page 20 of 43
Audio Bit Rate (bps):
Various selections from
16Kbps
to
384Kbps.
Default is
160000
. This sets
the total bit rate for the combination of the 2 audio channels (left and right channels of each
audio pair). (The default of 160Kbps actually produces the same TS Stream Bit Rate as setting
the audio bit rate to 128Kbps because of size constraints for audio packet sizes that must fit
within a fixed TS packet size.) The minimum audio bitrate is 16Kbps and the maximum is
384Kbps per channel. When encoding 5.1 surround-sound, the bit rate you specify is for the
entire set of 6 audio channels. (See Figure 9, below.)
NOTE:
The audio sampling rate is fixed at 48 KHz as this is standard for SDI.
Audio Channels: 0 (no audio), 2 (1 stereo pair), 4 (2 stereo pairs), 6 (3 stereo pairs), 8 (4
stereo pairs), 4 channels (independent), 5.1 multi-channel*, 5.1 downmix to stereo, AC-
3 pass through, AC-3 transcode, or AC-3 transcode to stereo,
. Default is
2 (1 stereo
pair)
. This setting allows you to select how to handle the embedded audio and which audio
channels to encode. For many streaming applications, video players cannot handle multi-
channel surround-sound. For multichannel input in a streaming applications, we recommend
downmixing or transcoding to stereo. (See Figure 9, below.)
*
NOTE:
Encoding to 5.1 Surround-Sound only applies to AAC and Opus. MPEG1 is only
applicable to stereo pairs.
Output 1, Output 2, Output 3, Output 4: Video output URLs (Universal Resource Locator).
This is described in detail in the next section
Note:
Please remember to always hit the
SAVE
button after making any changes or your changes
will be lost. You must also restart the encoder with the updated profile for these changes to
take effect. You can do this by simply clicking
Start.
Figure 9. List of audio channel options, audio encoding formats and audio bit rates.