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

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Helix Mobile Producer On-Demand User’s Guidetime. The first pass takes about as long as it would to encode the source filefor one target audience.Although two-pass encoding helps when you use constant bit rate encoding, itprovides greater benefit for variable bit rate (VBR) encoding, described in“Variable bit rate (VBR)” on page 30. With two-pass encoding, Helix MobileProducer On-Demand can analyze the entire video file to determine how bestto vary the playback bit rate through the length of the clip. Without two-passencoding, Helix Mobile Producer On-Demand sequentially analyzes smallsections of the source file during encoding, creating a string of VBR sectionswithin the clip.Tip: Use two-pass encoding whenever you encode from adigitized file. Turn it off only if you must decrease theencoding time.Setting the Bit RateUse this option to set the standard bit rate for encoding the video stream, inkilobits per second (Kbps). Note that to set a constant bit rate or a variable(average) bit rate for the clip, you use the Bit rate control option, as describedin “Bit rate control” on page 29.Setting Audio ParametersThis section explains how to use the various encoding options to set the basicparameters for encoding audio input.The default audio encoding parameters in Helix Mobile Producer On-Demand have been set carefully to provide the best overall quality of audiooutput for the most common streaming audio scenarios. We recommendchanging these parameters only if you have advanced knowledge of audioencoding.34
CHAPTER 6: Setting Encoding ParametersThe Audio Parameters (AAC encoder)Encoder typeThe following table lists and describes the six audio encoding formatssupported by Helix Mobile Producer On-Demand.FormatAACAAC PlusEnhanced AACPlusAMRnarrowbandAMR widebandAudio Encoding FormatsDescriptionAdvanced Audio Coding Low complexity. AAC-LC allows thefollowing settings:• bit rate - a value from 8 000 to 320 000 bps, default value is96 000 bps• joint stereo option• the audio sampling rate in kHz - allowed range is dependant ofthe defined audio bit rate• the number of channels (1 or 2) - allowed range is dependant ofthe defined audio bit rateAAC Plus allows the same settings as AAC-LC, except joint stereooption.Note: AAC Plus is only available for use with the 3GPP v6 exporttypes.Enhanced AAC Plus allows the same settings as AAC-LC, exceptjoint stereo option.Note: AAC Plus is only available for use with the 3GPP v6 exporttypes.Adaptive multirate speech codec. The options for AMR-NB arelimited to the bit rate selection, and the Use Silence Detectionoption.Adaptive multirate speech codec. The options for AMR-WB arelimited to the bit rate selection, and the Use Silence Detectionoption.35
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