helix mobile producer on-demand user's guide - RealPlayer

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Helix Mobile Producer On-Demand User’s GuideFormatQCELPRealAudioMP3Audio Encoding Formats (continued)DescriptionQualComm Code Excited Linear Predictive Coding speech codec.The only option is one of these two bit rates:• 14 000 bps (full-rate)• 6 800 bps (half-rate)RealNetworks audio file format. The only option is the codecflavor.MPEG-3 audio file format. The only option is the bit rate (in bps).Note: Stereo or Mono is specified automatically: bit rates below64 000 are mono, 80 000 and above are stereo. If the inputis mono, then the output is also mono.Make-up of the Enhanced AAC Plus codecBit rateUse this option to specify the bit-rate value for an audio stream in bits persecond (bps). Different bit-rate ranges are available for different audioencoders.Note: This option is not available for the RealAudio encoder.Use joint stereo (AAC audio encoder only)Joint stereo coding removes redundancies between the left and right audiochannels of stereo sources. Select this option to encode channel redundanciesand differences separately. Using this setting can reduce the bit rate by asmuch as half, but it also might introduce some artifacts. Clear the Use jointstereo check box if you want the redundant portions to be encoded twice.36
CHAPTER 6: Setting Encoding ParametersCustom Sampling Rate (AAC, AAC Plus and Enhanced AAC Plus encoders)When you check this option, you can specify the channel mode (mono orstereo), and the sampling rate.Silence Detection - DTX compression (AMR encoder only)This option enables the encoder to detect silence periods in speech. Suchperiods are then coded with a "silence targeted algorithm" that improvescoding efficiency and decreases the bit rate.Flavor (RealAudio encoder only)Select an encoding preset depending on the input audio stream (voice,music,…).Setting Video ParametersThis section explains how to use the various encoding options to set theparameters for encoding video input. The following illustration shows thevideo parameters in the Audio/Video Streams tab.The Video parameters (H.264 video encoder)37
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helix mobile producer on-demand user's guide - RealPlayer

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