rm文件格式2.ppt

* #0 CNavigationFilter::StartStreaming (this=0x16442a0) at CNavigationFilter.cpp:712 #1 0in CNavigationFilter::Pause (this=0x16442a0, State=State_Paused_Paused) at CNavigationFilter.cpp:210 #2 0x007222b8 in CFlowManager::Pause (this=0x15d5990) at CFlowManager.cpp:281 #3 0x00df90f8 in VideoPlaybackAP::flow_pause (this=0x14eeb88, bScanSI=true) at VideoPlaybackAP.h:513 #4 0x00e00488 in VideoPlaybackAP::detect_resolution (this=0x14eeb88) at VideoPlaybackAP.cpp:11910 #5 0x00e1a96c in VideoPlaybackAP::Activate (this=0x14eeb88, pPayload=0x15d8120) at VideoPlaybackAP.cpp:1197 #6 0x00dc87f4 in AbstractAP::SwitchAPTo (this=0x14f0844, pNewAP=0x14eeb88, pPayload=0x15d8120) at AbstractAP.cpp:3521 #7 0x00dd1d88 in AbstractAP::ProcessKey (this=0x14f0844, command=0x3fb44ba0) at AbstractAP.cpp:5610 #8 0x00e7e1dc in IMSAP::ProcessKey (this=0x14f0844, command=0x3fb44ba0) at IMSAP.cpp:3697 #9 0x0064eea0 in main (argc=1, argv=0x3fb45154) at main.cpp:948 RM文件的封装和解复用报告 概述 Rm文件简介 Rm文件格式介绍 2664Hisense的code中对rm文件的demux Rm文件简介 简介： RM格式是RealNetworks公司开发的一种流媒体视频文件格式，它的特点是文件小，但画质仍能保持的相对良好，可以根据网络数据传输的不同速率制定不同的压缩比率，从而实现低速率的Internet上进行视频文件的实时传送和播放 ，即先从服务器上下载一部分视频文件形成视频流缓冲区后实时播放同时继续下载为接下来的播放做好准备 。 音视频编码：RealAudio、RealVideo(见备注) 与rmvb的主要区别： rm格式采用的是固定码率编码 rmvb采用可变码率（Variable Bitrate ）在画面变动大 的地方用的比特位多一些，平静的画面用少的比特位。 Rm文件格式介绍 Real chunk types: .RMF: RealMedia file header (only one per file, must be the first chunk) PROP: File properties (only one per file) MDPR: Stream properties (one for each stream) CONT: Content description/metadata (typically one per file) DATA: File data INDX: File index (typically one per stream) 每个单元的共同头部开始部分： typedef struct rm_generic_hdr { unsigned long id; /* unique identifier for this header */ unsigned long size; /* size of header in file */ unsigned short version; /* struct version */ } __attribute__((packed)) rm_generic_hdr_t; 1.RealMedia file header (.RMF) dword chunk type (.RMF)