Operation Manual

Niagara SCX User Guide
ViewCast 69
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Description
 If you enable B frames and set the MPEG type to MPEG-4, the resulting
H.263 file uses Advanced Simple Profile when you encode it.
NOTE: Some players, such as QuickTime player, become incompatible with streams that
include B frames. If your resulting stream has quality issues on playback, try disabling B
frames to ensure compatibility with most players.
The Video/Encode Quality setting currently remains inactive and does not affect the results
of the encoding stream or file.
Figure 92. MPEG-4 Basic Settings
 Under the Audio Format settings, you have another drop-down box that
includes several choices as for audio sampling.
 Set whether you want to encode the audio monophonic (mono) or
stereophonic (stereo).
 The Audio Encoder settings provide you with a drop-down box with two
primary choices:
— AAC (Advanced Audio Coding)
A standardized, lossy compression and encoding scheme for digital
audio.
AAC achieves better audio quality than MP3, a Motion Picture Experts
Group (MPEG) standard.
— AMR (Adaptive Multi-Rate)
An audio data compression scheme optimized for speech coding.
3GPP adopted AMR as the standard speech codec; it is widely used in
GSM.
You can either AMR narrow band (AMR-NB) or AMR wide band (AMR-
WB).
NOTE: When you select AMR Encoder for audio, the audio automatically encodes using 8 kHz
mono for playback on cell phones.
 The Audio Typesetting only relates to AAC Encoding.
 If you select AMR in the Encoder field, the system does not use this setting.
 The Audio Type field provides a drop-down box with two choices:
— Low Complexity (LC)