Dick Lu Email & Phone Number

Beijing City, China

1.develop rtmp,hls,http-flv,dash cdn system..2.develop push streaming sdk,which can push streaming to rtmp cdn system.3.deveop pull streaming sdk,which can pull rtmp,http-flv,and play on android an ios.4. sell our livestreaming system(pc,android,ios) to Baidu and kuaishou, and provide tech support.Baidu overseas show field website: www.cliponyu.comkuaishou:live.kuaishou.com5.research how to use live, panoramic and virtual reality technology in education, entertainment and shopping scence.we have Writed a panoramic livestream distribute system, and panoramic vod player.6. To research the application of speech big data in the fields of education, recruitment, e-commerce, advertising and so on.We have Writed a voice log and search voice system.7.My personal technical research direction is audio and video and network transmission, focusing on livestreaming, vod cdn, VR, AR technology..

Beijing,China

Project: show live interaction, P2P download systemTechnology / platforms / tools: C / C++ / Android / ios／linuxtwenty team members, 100 million customers,website: http: //www.mobogenie.com.(一)Project One: show live interaction1. Server, modify nginx-rtmp module. Reduce cache latency.2. Integrate ffmpeg, provide recording capability, and store video on cloud system.3. Realize the function of direct seeding cluster, guarantee the second level cluster, and improve the concurrent ability of direct seeding.4. Research and development of pc,android,ios push client. Adjust the collection parameters to reduce the gop time, so as to reduce the delay.5. Modify the open source senders system to achieve too large cache, refetching frame number, and effectively reduce delay.6. Adopt h265 codec, improve compression ratio and save bandwidth.7. Deeply modify webrtc to realize point-to-point voice and video real-time interaction. Save bandwidth and delay within 1 seconds after opening hole.Project 2 P2P download system1. Implement a million concurrent index servers.2. Implement pc and android p2p client.3. Realizing P2SP sharing, in which contains http seeds.4. Save a lot of bandwidth for the company.Management:1. Formulate the company's technology strategy, select the development framework, and plan.2. Implement agile development system deeply.3. Organize manpower to work on key issues, such as server concurrent stress.4. Pay attention to the research frontier p2p, interactive broadcast the latest technology, as much as possible in the project.

Beijing City, China

About technology / platforms / tools: C / C++ / flv / rtmp/ mp4 / hls/ts/rtsp / rtp / Linux / windows/android / ios/ffmpegCore team members 10, responsible for P2P acceleration, audio and video processing related products development and maintenance.(I) specific work itemsProject-P2P Fast Potato Video acceleration system1. CDN partition acceleration strategy, hot chip source cache policy and P2SP acceleration strategy, cache management design.Project II Entertainment Video P2P Live system1. Combine the cdn synchronization system of Tudou net, realize the P2P direct seeding system cluster.2. Adopt multiple upload, multiple small cdn live broadcast cluster structure. Effectively support 700,000 high concurrent live broadcast.3. Design of media block scheduling algorithm. Emergency buffer, secondary buffer scheduling algorithm. P2P sharing is realized under the premise of user experience, and the delay is reduced.Project 3 flv Assembly mp4 High concurrency Server1. Flv dynamic assembly into mp4, so that the small video in the client looks like a small mp4 file.2. In this way, the hard disk space can be saved effectively, and the browsing ability of video in each terminal can be improved.Item 4 hls real-time slicing, slice cache in memory, high concurrency on demand system.1. Because Android / iPhone supports HLS.2. Develop real-time hls slicing system.3.Cache slice in memory. Solve the problem of too many file fragments effectively. Combine with video cdn system, improve the concurrent ability of media server on demand.4. With hls, it is easy to access Tudou web video from almost hls-enabled endProject 4 multiplayer interactive direct broadcast systemThe goal is to support a variety show with second-second delays and allow multiple viewers and hosts to interact.1. Using directshow to collect data from high-end video recorder.

中国 北京

Responsible for 360 P2P network monitoring P2P download system, involving products: software butler, vulnerability patch.It involves technology / platform / tool: C / C++ / Windows Linux / TCP / MFC/bt protocol / kad algorithm.Team member 10.(I) specific elements of work:Project 1 P2P network monitoring cluster1. To monitor the popularity and frequency of download files for P2P users. Crack down on piracy, illegal distribution, and extend 360 security ideas.2. The basic logic of cluster work: masquerade dozens of machines as bt and emule nodes, crawl the network files, videos and other resources according to dht or kad protocol, and weigh these collected resource names ip, content type, release time, etc. Merge to the database. Display the local distribution, heat, etc of the file owners through the reporting system.Project II 360 P2P download acceleration system1. Server tracker design and implementation, single network card per second 200,000 request packets, single machine active user 4 million.2. Design and implementation of P2P download and upload client, implement BT-like protocol mapping, drilling, file caching, doing kind of logic, encryption, preventing bad seed spreading P2SP acceleration, intranet seed, intelligent speed limit.(II) Management:1. Write the framework yourself, core logical code, and take the lead.2. Review the member code, identify shortcomings, and allow them to improve their skills in their spare time.3. Train testers and actively coordinate the contradiction between testing and developers.

Beijing City, China

Responsible for live, on-demand client and media source server development. Team member 10.About technology / platforms / tools: C / C++ / vc2003 / mfc/ wmv / rmvb / rtsp/ rtp.Project P2P on demand, live broadcast system1. Read bt and emule algorithm and use it for reference to realize all kinds of strategy algorithms of our system.2. Design of P2P node management algorithm (node list acquisition, update, data exchange, etc.)3. Cache management design (media block storage, query, exchange, etc.4. Network communication design UDP hole, data verification, exchange protocol definition.5. Development of client (play, interface implementation).6. The development of media source server, such as parse, cache, distribute, etc.7. Development of operation management database website (user rights management, information collection and statistics, advertising strategy.8. Development of tools (operating system / WMP / Realplayer version testing, server connectivity testing.9. Task allocation. Support for team members' daily development.