Epiphan Pearl Mini Live Video Production System with 512GB SSD (NA/JP) - Manual (Page 199)

Pearl Mini User Guide Configure audio encoding
4. Configure the frame size, do the following:
a. Uncheck Use current signal resolution as the frame size.
Enabling Use current signal resolution as the frame size is not recommended
if the video input resolution changes frequently. An unstable cable or other
disturbance that causes the resolution of the video input signal to change during
a live stream can cause the stream to drop. Unchecking this feature helps
prevent that.
b. Select a Frame size from the list of options or enter a custom frame size in pixels.
5. Change the Limit frame rate. The default should be adequate in most applications. While decreasing the
limit may improve system performance, you may need to test different values to balance video
smoothness and processing power
6. Change the Bitrate. You can increase or decrease image quality by increasing or decreasing the target
Bitrate value. Video with a high level of motion and high resolution, such as a sporting event, requires a
high bitrate.
7. Click Apply.
Configure audio encoding
If your channel includes audio sources in any of the layouts, then AAC 48 kHz is set as the default audio codec
for the channel. You can choose a different audio codec for a channel using the Admin panel. The following table
lists the supported audio codecs and bitrates.
Table 41 Supported Audio codecs and bitrates
Value Description
AAC
The AAC (default) audio codec is comparable to MP3 and may produce better sound
quality with a similar bitrate. Supported values are 16, 22, 44 and 48K kHz.
Most digital signals (HDMI or SDI sources) use 48 kHz audio. Matching the encoded
level with the source level provides the best sound quality by avoiding audio
resampling. For analog signals, 44 kHz provides higher sampling.
The maximum bitrate for mono encoding of a 44 kHz signal is 264 kbps. For stereo,
320 kbps is supported. Note that lower bitrates (e.g. 32 kbps) with a 44 kHz signal
may result in distorted audio.
MP3 MP3 provides a common audio format for audio storage. Supported values are 22
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