1、首先從https://github.com/volvet/h264extractor打包下載

2、讀README.md 全文如下：

# h264extractor
wireshark plugin to extract h264 stream from rtp packets, support Single NAL Unit Mode(RTP Packetization Mode 0),  FU-A and STAP-A.  In addition, opus stream is supported as well.


# How to use h264extractor
* Copy rtp_h264_extractor.lua to the directory where wireshark was installed
* edit init.lua,  make sure "disable_lua = false" and add "dofile(DATA_DIR.."rtp_h264_extractor.lua")"
* when open pcap file in wireshark,  decode as RTP and configure the H264 dynamic payload types.  
* Menu - Tools - Extract h264 stream from RTP


# How to use opus extractor
* Copy rtp_opus_extractor.lua to the directory where wireshark was installed
* edit init.lua,  make sure "disable_lua = false" and add "dofile(DATA_DIR.."rtp_opus_extractor.lua")"
* when open pcap file in wireshark,  decode as RTP.  
* Menu - Tools - Extract opus stream from RTP


# TODO
* H265 extractor


# Reference
* https://wiki.wireshark.org/Lua
* https://tools.ietf.org/html/rfc6184
* https://tools.ietf.org/html/rfc7587
* https://tools.ietf.org/html/rfc7798

其中H264部分的大意為：

編輯安裝目錄下的init.lua檔案（如WIN10系統可能編輯不了，需要在其它盤下編輯好後，複製過去），需確認

disable_lua = false，在檔案最後"dofile(DATA_DIR.."rtp_h264_extractor.lua")"。

把rtp_h264_extractor.lua複製到安裝目錄下，開啟wireshark在工具選單多了一項：Extract h264 stream from RTP，

如下圖所示：

開啟wireshark， 在解碼為當前值選擇RTP。

檢視rtp包的payload type（如96），那麼在wireshark工具欄選擇編輯-首選項->protocols->H264,

把H264 dynamic payload types設成96。

設定完以上，執行工具-Extract h264 stream from RTP，

執行後，會生成dump.264,一般會放在與碼流檔案同一個路徑下。

參考：

http://blog.csdn.net/volvetandanny/article/details/47087641

https://github.com/volvet/h264extractor 

https://wiki.wireshark.org/Lua

http://www.lua.org/