Advanced Profile (AP): This feature allows improved quality for low delay application. Instead of sending
single big iFrame, the encoder spreads keyframe in a left-to-right pattern, producing slightly lower delay and
more graceful image recovery. This is more useful for lower bitrates, below 12 Mbps.
Bit Depth: The number of bits used for color in the pixels. Possible values are 8, 10, and 12. (12-bit is ACT-L5
only). For similar quality, a 10-bit setting requires an additional 25% bitrate over 8-bit, and 12-bit requires 50%
more than 8-bit.
Color Space: Select the color gamut for the stream.
Audio Settings
The Audio Settings allows changes to be made to the stream’s audio parameters. Do not make changes to this
menu during live broadcasts as it will interrupt the audio feed.
Codec: Selects the audio codec to use for audio transport. The codecs and their per-channel bitrates are listed
below:
● PCM (256Kbps): This uncompressed audio is only available in ACT-L5 codec mode. Normally up to 8
channels are supported, with 16 channels support as a paid option.
● AAC (128Kbps): The AAC audio codec is the highest quality audio available with ACT-L3.. AAC is the
only option which allows for 6 (5.1) and 8 channel audio.
● GSM (77Kbps): The GSM audio codec delivers medium quality audio for lower bandwidth usage. Using
GSM audio will allow for lower latency over the ACT-L3 or ACT-L5. This codec only supports mono audio
(single channel). If the source video has 2 or more input channels, and GSM or CELP are used, the channels
will be merged.
● AAC Low Bitrate (64Kbps): The AAC low bitrate audio codec delivers lower quality audio for half the
bandwidth usage of the AAC setting.
● CELP (24Kbps): This codec only supports mono audio (single channel).
● GSM Low Bitrate (20Kbps): The GSM low bitrate audio codec delivers lower quality audio for lower
bandwidth usage. This codec only supports mono audio (single channel).
● CELP Low Bitrate (12Kbps): The CELP low bitrate audio codec delivers lower quality audio for the
lowest bandwidth usage, and is best used for voice-only transmissions. This codec only supports mono audio
(single channel).
Channels: Selects the number of audio channels to encode. Set to 1 channel when using CELP or GSM.
Sample-rate: Selects the audio capture sample rate.
To save your settings, press ‘Apply Changes’. If you want to go back to original settings, press ‘Apply Defaults’.
Save Preset
Presets allow the user to recall frequently used ACT-L3 or ACT-L5 configuration settings quickly and easily.
Presets can be helpful for engineers in configuring a unit, thus requiring less training for non-technical users.
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