video encoding formats

Author: Hu Zhenyu Recently, many of my friends have asked me some questions about audio/video encoding and decoding. This is probably because of the popularity of mobile phones, PDAs, and other devices and the increase in bandwidth, the spread of audio and video is becoming more and more popular. However, I found that many of my friends are still unclear about s

You can use v4l2 to successfully collect the yuyv video and encode it into H. 264 file, because yuv420 was previously encoded as H. 264 program, so I think yuv422 is encoded into H. 264 is also similar and should be quite simple. So I am very happy to write the encoding function. Encoding yuv420 I am referring to this article and this blog post. I am now ready to

. That is to say, the collected YUV is written to a file and saved in the form of an interline scan. If the interleaved check box is not checked, the player cannot play your YUV file normally. The following figure shows the images normally displayed: Hey, this is my photo. ^_^ YUV video collection is normal, but videos encoded with x264 are still rendered unsightly !!! What should I do? Please refer to my next blog titled "yuyv

In the previous article because the USB camera used on the PC can only support Gpeg image format, but the H264 encoding needs to use YUV data, so I found an arm development board to do the test. This thought that the code from the PC to the Development Board is a very simple thing, who knows that because the platform or v4l2 the difference between the bottom of the drive, and finally spent the Dickens to solve the problem. Words not much to say, direc

IVideo Encoding 1.1 target of video compression and encoding 1) Ensure compression ratio 2) Ensure recovery quality 3) easy to implement, low cost, and reliability 1.2 starting point of compression (feasibility) 1) Time Correlation In a video sequence, adjacent two adjacent frames have very few differences. This is th

Http://zh.wikipedia.org/zh-cn/LibavcodecHttp://baike.baidu.com/view/856526.htmLibavcodec is a LGPL free software codec library for video and audio data encoding and decoding work. Libraries with this name have ffmpeg projects and LIBAV projects, but they are incompatible with each other.Libavcodec is an integration of many open source multimedia applications and frameworks. Common MPlayer, Xine, and VLC med

III. H. 264 of the video encoding layer error recovery [] In H.261, H.263, MPEG-1, MPEG-2, many error recovery tools have been well applied: different formats of image segmentation (slices and block groups), I-mode macro blocks, slices and image interpolation, select reference images (with and without feedback, image level, GoB/slice or MB level), and separate da

This article introduces a simple Video Encoder Based on FFMPEG. The yuv420p pixel data is encoded as H.264 compressed data. The code of the encoder is very simple, but every line of code is very important. It is suitable for a good study. After the code is clarified, the encoding process of FFmpeg is basically clarified. Although I have already completed the program, I still haven't made it clear in some pl

. In the figure, the blue background function is the function that actually outputs data. The Light Green function is the video encoding function. Briefly introduce the meaning of each function in the process (the previous YUV code was written in H.264. copy and paste it here ): Av_register_all (): registers all the codecs of FFmpeg. Avformat_alloc_output_context2 (): Initialize AVFormatContext of the ou

In one of my favorite movie scenes, Clark W. Griswold (played by Chevy Chase in "Crazy Christmas Holidays") trapped himself in the attic while hiding Christmas presents. To keep warm, he wore pink gloves, green hats and brown fur shawls found from dusty closets. At the bottom of the wardrobe, he found a family movie that had been recorded since he was a teenager. With tears in his eyes, he finished the film with an old film projector. Since then, family movies have gone through a long journey,

x264_picture_alloc.The structure of the stored data is as follows.X__picture_t: stores pre-compression pixel data.X1__nal_t: stores compressed encoded bitstream data. The flowchart also contains a "flush_encoder" module, which uses the same functions as the encoding module. The only difference is that no video pixel data is input. It is used to output the remaining bitstream data in the encoder. Source co

I. Preface in the past 20 years, Internet, mobile communication and multimedia communication have achieved unprecedented development and great commercial success. The convergence of mobile communication and multimedia technology is accelerating. research results in network architecture, low-power integrated circuits, powerful digital signal processing chips, and efficient compression algorithms are emerging. Video Image Coding and transmission technol

The project uses video codec, which has been around for the last half a month. To be honest, it has taken a lot of detours and wasted a lot of time. Record your final results here, hoping to help others. Reference Tutorial: Http://ffmpeg.org/trac/ffmpeg/wiki/ubuntucompilationguideinstall the ffmpegand x264 official tutorials (be careful not to use command line installation, there will be a lot less libraries. Installation and compilation are the safes