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

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Helix Mobile Producer On-Demand User’s GuideThe following table lists the types of packet headers and the typical sizefor each one.Typical Packet Header SizesHeader Size (in bytes)IP 20PPPoE 8RTP 12RTSP interleave 4TCP 28UDP 8The following table lists the applicable RFCs and gives a description andthe typical MTU for each one.Typical MTUsRFC Description MTU894 Minimally required 681051 ARCNet 5081356 X.25, ISDN 5761055 Serial line IP (SLIP) 1,0661042, 2516 IEEE 802.3 / 802.2, PPPoE 1,492894, 895 Ethernet 1,5001390 FDDI 4,3521042 4-Mb token ring 4,4641042 802.4 token bus 8,166None 16-Mb token ring 17,9141374 HIPPI 65,535Loss Protection (RealVideo encoder only)Adds error correction information to the video stream to assist the player inreconstructing lost packets.50
CHAPTER 6: Setting Encoding ParametersLatency mode (RealMedia export type only)Each RealVideo clip has a maximum startup latency that determines how longvideo requires to display after RealPlayer begins to receive the stream.There are three possible values:• Normal (longest delay from real-time, but best viewing experience),• Moderate (shorter initial delay that may increase and produce some rebuffering,• Low (shortest delay, but intermittent sections of media may be lost).If you select Normal, you can specify the maximum latency. This specifies thevideo buffer size, from 1000 ms to 25000 ms. The default is 4000 ms.Increasing the latency may be particularly useful for videos that stream at lowbit rates and start out with high action sequences. The longer latency creates alarger data buffer for the starting sequence, and generally improves the video’sappearance. Bear in mind, however, that a long latency time may cause restlessviewers to stop the presentation before it begins playback.Note: The startup latency does not affect how quickly adownloaded clip begins to play. Increasing the latency value,however, can improve the visual quality in downloaded clips thatbegin with fast-action sequences.Setting MetadataHelix Mobile Producer On-Demand can encode clip information directly intoa clip or broadcast. This is highly recommended for all jobs because the clipinformation tells the viewer about the stream and can help search enginescategorize clip.You can specify the following information.TitleAuthorIn this field, enter the title of the clip or broadcast. Because this title appearsin the RealPlayer interface, it is best to use a short title.This field holds the name of the person or organization that created the clip.51
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HELIX MOBILE PRODUCER ON-DEMAND USE
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CONTENTS1 INTRODUCTION 1What is Hel
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ContentsEncoder type...............
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QCELP 91RealAudio 91audio encoding
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command-line interface 4, 55, 56com
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installer 10installer file 9interle
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RTP 50RTSP 50RTSP interleave 50TCP
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VBR encoding 31VBR file 31VBR video
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helix mobile producer on-demand user's guide - RealPlayer

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