Helix Broadcaster 100 Touch Screen User Guide
CHAPTER 4: Video and Audio Options
29
Buffer Size
The output buffer size sets the number of milliseconds of output data that is buffered before it
is delivered to the output destination. The default value is
300
milliseconds. For low-latency
encoding and delivery, set a value of
200
or
100
.
For More Information:
For details about low-latency encoding, refer to “Low-
Latency Encoding Values” on page 18.
Audio Options
The
Audio
tab for an output sets the audio format and streaming rate.
Audio Settings
Audio Codec
The
Audio Codec
drop-down determines how the input audio is encoded in the output:
•
No Audio Transcoding
If you select this option, Helix Broadcaster will not re-encode the stream, which saves
processing power. The audio is passed through as-is, however, and you cannot change
characteristics such as streaming speed or sampling rate.
•
MPEG2 Audio
MPEG-2 audio is common to television production. It should be used only at output rates
(video plus audio) of 1 Megabit per second or higher. This format is typically not
renderable by Internet media clients.
•
Remove Audio
If this option is selected, Helix Broadcaster does not encode or pass through any audio.
This results in a video-only stream. When you choose this option, other audio settings are
ignored.
Note:
Do
not
select this option when encoding from an SDI or HDMI input.
•
AAC Audio
Encode the audio with an AAC codec. If the input stream is already encoded as AAC,
choose this option if you need to change stream characteristics, such as setting a different
streaming speed or AAC profile.
