webrtc h264

The main reference in this document is [1], which takes the code from the reference article. But [1] did not upload the complete code. Environment configuration can refer to the previous article [2] The main realization of the video in the local transmission. It took a day. As for WEBRTC video capture, codec, please refer to the online blog, here is not mentioned. Compile using CMake to generate makefile, step cmake. Note the points that follow, an

There are two types of echoes in voice calls:1. Circuit echo (already resolved)2. Acoustic echoTwo echo cancellation modules are designed in the WEBRTC source code:1.AEC (Acoustic Echo canceller): PC side2.AECM (Acoustic Echo Canceller mobile): MobileAECM:Causes of acoustic Echo:The voice of the proximal speaker is picked up by his microphone and transmitted to the far end via the network,The sound from the remote speaker is picked up by the microphon

() {var newindex = (Filters.indexof (canvas.classname) + 1)% Filters.length; Canvas.classname = Filters[newindex];} Navigator.getusermedia = Navigator.getusermedia | | Navigator.webkitgetusermedia | | navigator.mozgetusermedia;//WebRTC Constraintsvar constraints = {audio:false, video:true};var video = Document.queryse Lector ("video");//MediaStream as Video input function Successcallback (stream) {window.stream = stream;//Stream available to console

 Reprint Please specify source: http://www.cnblogs.com/fangkm/p/4401075.html The first two blog posts complete the WEBRTC audio and video collection module, and the next step is to introduce the key audio and video coding modules. However, before introducing the audio and video coding module, we need to introduce the channel concept, and the transmission flow of each WEBRTC data is encapsulated into a c

Due to my recent reading of h264 files, I encountered the problem of how to read the full frame data, through the use of Elecard Stream Analyzer tools, as well as the combination of "new generation of video compression coding standard--H264/AVC" (second edition) book, and found in the online summary as follows: First NAL syntax, title syntax, and Nal_unit_type semantics must know: The above two graphs are

Recent projects need to record video taken by the camera, using H264 encoding. The test found that H264 encoded 2k (1980x1080) video was smooth, but encoded 4k (3840x4120) video showed noticeable lag phenomenon. Therefore consider using H264 Nvenc hardware encoding.The original code Avcodec *codec = Avcodec_find_encoder (av_codec_id_h264); Switch Avcod

The Base_clock of PTS here are calculated in terms of 1000 (milliseconds), and if reused in TS, the Base_clock is 90k, so it should be multiplied by 90. About the H264 in the SPS recorded in the frame rate is twice times the actual frame rate, including slice inside the PIC_ORDER_CNT_LSB is also twice times the increment, I guess the code according to the Sub-field (Top field, bottom field) coding. H264 es

using MP4V2 to synthesize h264+aac mp4 files Recording program to add new features: Record CMMB TV shows, our cards are sent out of the RTP stream (H264 video and AAC audio), the recording program to do the work is: (1) Receiving and parsing RTP packets, separating out H264 and AAC data streams; (2)

Recently, I am working on an online tutorial network project. I need to upload videos in any format to automatically play h264 standard videos using html5. Finally, PHP + FFMPEG is used for implementation. here we will share our detailed solutions with you! FFmpeg Configure the php. ini file The code is as follows: File_uploads = on; // whether to allow file upload over HTTP. ON is enabled by default.Upload_tmp_dir; // upload the file to the place

PHP + FFMPEG Enables automatic Transcoding of videos into H264 standard Mp4 files, Configure the php. ini file Copy codeThe Code is as follows:File_uploads = on; // whether to allow file upload over HTTP. ON is enabled by default.Upload_tmp_dir; // upload the file to the place where the temporary file is stored on the server. If it is not specified, the default Temporary Folder will be used.Upload_max_filesize = 1024 m; // wangwen business, that is, t

next sequence, that is, the image generated a complete frame A1, then the image is referenced A1 generation, Write only the difference between the A1 and the content.In the H264 protocol defines three kinds of frames, the fully encoded frame called I-frame, referring to the previous I-frame generated by only the difference part of the encoded frame called P-frame, there is a reference frame encoded before and after the frame is called B-frame.The cor

This article outlines:This paper introduces the famous open source audio and video codec library ffmpeg how to decode H264 stream, and elaborates its h264 stream input process, decoding principle and decoding process in detail. At the same time, most of the application environment, the original stream video size display is not the best way, so developers need not only to decode the video stream, and need to

Network Abstraction Layer Unit type (NALU):The Nalu header consists of a byte with the following syntax:+---------------+|0|1|2|3|4|5|6|7|+-+-+-+-+-+-+-+-+| F| nri| Type |+---------------+F:1 a bit.Forbidden_zero_bit. This one must be 0, as stipulated in the H.Nri:2 a bit.NAL_REF_IDC. Taking 00~11, it seems to indicate the importance of this nalu, such as 00 of the Nalu decoder can discard it without affecting the playback of the image.Type:5 a bit.Nal_unit_type. The type of this NALU unit is su

Original http://blog.csdn.net/gubenpeiyuan/article/details/19548019 ThemeFFmpegThis article outlines:This paper introduces the famous open source audio and video codec library ffmpeg how to decode H264 stream, and elaborates its h264 stream input process, decoding principle and decoding process in detail. At the same time, most of the application environment, the original stream video size display is not th

Transferred from: http://cache2.weidaohang.org/h/index.php?q=aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemh1cWluZ183MzkvYXJ0aWNsZS9kZXRhaWxzLzY2MzY4NTc=Has been more confused a problem, all said FFmpeg function is very powerful, but he has not been to study, today finally saw a bit of its strong place!First of all, of course, the Linux compiler and installation success FFmpeg, about the specific installation process, you can refer to my previous blog post!Here is a direct introduction of how to put.

Intel Sandy-bridge HW h264 EncoderGOP(Group of pictures) settings You can set h264 encoder parameters by referring to the sample code provided by the Intel Media SDK: Intel (r) Media SDK encoding sampleUsage: sample_encode.exe h264 | MPEG2 [Options]-I inputyuvfile-O outputencodedfiLe-W width-H heightOptions:[-Nv12]-input is in nv12 color format, if not specified

Http://bbs.chinavideo.org/viewthread.php? Tid = 7575 I believe many of you want to play h264 video streaming media like me. However, a newbie often does not know where to start. Using Baidu, Google, and other search materials is a treasure. After N weeks of thinking, I made some achievements. It took a lot of useless effort. I spent a week watching the English protocol, and later I learned that there was a Chinese version, in addition, the g

It seems that the problem can only be solved in this way. Now we need to test more to prevent new problems. Currently, it does not affect the existing code, and the frame of the screen is directly blocked. Ideas:I asked about h264 decoding of the set-top box. They used hardware decoding. They simply set an interface provided by hardware decoding: Set the error processing mode.I think this error handling mode will definitely block the wrong frames, so

Awesome video conferencing website: http://wmnmtm.blog.163.com/blog/#m =0 ++++++++++++++++++++++++++++++++++++++++++++++++++++ http://wmnmtm.blog.163.com/blog/static/38245714201192491746701/ When using RTP to transmit H264, we need to use the SDP protocol description, two of them: Sequence Parameter Sets (SPS) and picture Parameter Set (PPS) need to be used, so where are these two items obtained? The answer is to get it from the

==================== Problem Description ====================Use Videoview to do the display. Play all the way a little problem, no card, very real-time, but, more can not play, also reported wrong. Automatically eject a dialog box that cannot be played.The same is true with Surfaceview.I hear it's because the Android bottom only supports decoding.Do you have to transplant ffmpeg? But this is soft decoding ah, the efficiency is too low, and seemingly quite complex.Who has a better way to do it.