ffmpeg convert

(TIME_BASE_Q))/(double) (av_q2d (time_base));A very simple mathematical conversion. Also, because the transcoding process may be much faster than the actual playback, in order to maintain smooth playback, to determine the DTS and the current real time, and the corresponding delay operation, as follows Delay int64_t pts_time = Av_rescale_q (Enc_pkt.dts, Time_base, time_base_q); int64_t now_time = Av_gettime ()-start_time; if (Pts_time > Now_time) av_usleep (pts_time-now_time);

The system has ffmpeg with its own installation, such as not supporting '-LIBFAAC ' Recompile method: Content Source: Https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuideLucid Compile FFmpeg on Ubuntu Lucid Lynx 10.04 LTS This guide supports Ubuntu Lucid Lynx 10.04LTS. If you are using a different Ubuntu version, the main Compile

=====================================================The simplest example of a ffmpeg-based mobile Sample series article List:The simplest mobile-based example of FFmpeg: Android HelloWorldThe simplest ffmpeg-based mobile sample: Android Video DecoderSimplest FFmpeg-based mobile sample: Android Video Decoder-Single lib

FFmpeg library function source code analysis article list: "Architecture Diagram" FFmpeg source code structure diagram-decoding FFmpeg source code structure Map-Encoding General FFmpeg Source code Simple analysis: Av_register_all () FFmpeg Source code Simple analysis: Avcode

FFmpeg decoding process 1. Starting from the basicsFirst, several concepts are provided to facilitate understanding in the subsequent analysis.Container: a container in audio and video. It generally refers to a specific file format, which specifiesAudio and video, subtitles, and other related informationStream: This word is subtle and used in many places, such as the TCP and svr4 systems.It can be understood as pure audio or video data.Frames: this co

available. The block mode can be determined based on the macro block header information. H264 organizes information in layers. I don't know if you understand it. ========================================================== ========================================================== ==== Xforwar_encoder_encode sends a parameter to the pic_in frame to be encoded. The function first extracts a frame from the free queue to carry the new frame, its I _frame is set to play sequence count, for example, f

avrational *supported_framerates: Supported frame rate (video only)const enum Avpixelformat *PIX_FMTS: Supported pixel format (video only)const INT *SUPPORTED_SAMPLERATES: Supported sample rate (audio only)const enum Avsampleformat *SAMPLE_FMTS: Supported sampling format (audio only)Const uint64_t *channel_layouts: Number of channels supported (audio only)int priv_data_size: size of private dataAvstream (located in avformat.h) is the structure that stores each video/audio stream information.===

-01316438de54fba6421e9817746b2229 Allow Flash Player to support playback of MP4 files, and solve the problem of not loading side-by-side multicastFirst, let the Flash Player support MP4, you need to convert the encoding to H. MP4.Second, to solve the problem of side loading side playback, the MP4 in the metadata information to the file head, the specific method is as follows:1th Step: Download and install FFmpegUse under WindowsDownload Address: http

Here's a quick look: FFmpeg is a complete solution for recording, converting, and streaming audio and video, a leading audio/video codec class library. The official official version of FFmpeg does not support RMVB and RM formats. But there are a lot of solutions. The official website of FFmpeg is http://ffmpeg.mplayerhq.hu/. The Chinese wiki is http://www.ffmpe

=====================================================The simplest example of a ffmpeg-based mobile Sample series article List:The simplest mobile-based example of FFmpeg: Android HelloWorldThe simplest ffmpeg-based mobile sample: Android Video DecoderSimplest FFmpeg-based mobile sample: Android Video Decoder-Single lib

Document directory 1. register all container formats and CODEC: av_register_all () 2. open the file: av_open_input_file () 3. Extract stream information from the file: av_find_stream_info () 4. Search for all the streams in codec_type_video format. 5. Find the corresponding decoder: avcodec_find_decoder () 6. Enable the codec: avcodec_open () 7. allocate memory for decoding frames: avcodec_alloc_frame () 8. Continuously extract frame data from the code stream: av_read_frame () 9. Dete

the new version of the MinGW direct installation can be used. Below is Wingw's Web page http://www.mingw.org/wiki/InstallationHOWTOforMinGW. Download the latest version of MinGW in the box to build the Mingw+msys environment directly.The following minor modifications, in order to implement the FFmpeg compilation.3) Modify "Msys.bat"Open X:\msys\msys.bat with a text editor, because you intend to compile the program with msvc++, you need a. lib file to

This document records the FFmpeg-based video decoder on another Android platform. Unlike the decoder documented in the previous article, the decoder documented in this article no longer uses class libraries such as libavcodec.so, libavformat.so, and only uses a class library--libffmpeg.so. The source code for the video decoder C language comes from the simplest ffmpeg+sdl-based video player. The related con

Start as follows:FFmpeg is an open-source project developed based on Linux. The source code is incompatible with the C/C ++ compiler provided by the most common Visual Studio in windows. Therefore, it cannot be compiled using msvc ++. To use FFMPEG, the first problem to be solved is to configure a Linux-like compiling environment in windows, compile FFMPEG into a binary library, and then use it for further

Download FFmpegFrom FFmpeg official website: http://ffmpeg.org/download.html Download the latest FFmpeg installation package and unzip it using the following command: TAR-JXVF ffmpeg-2.5.3.tar.bz2 or download it from GitHub using git:ConfigurationThis article makes a relatively simple configuration: ./configure–enable-shared–prefix=/usr/loc

A series of sample programs on FFmpeg were made, which consisted of the FFmpeg sample program collection, which included the following items:Simplest ffmpeg player: The simplest ffmpeg-based video playerSimplest ffmpeg audio player: The simplest

Compile and install FFmpeg from the source code in the Mac OS X Environment Recently, due to a project requirement, real-time video codec needs to be developed, and FFmpeg is used for real-time video codec in x264 mode. In Windows and Linux environments, FFmpeg dynamic libraries, header files, and other resources are easily obtained, and the compilation environme

I. Cross-compile FFMPEG library on the MIPs platform in Linux: 1. Download the source code of the FFMPEG Library(Http://sourceforge.net/project/showfiles.php? Group_id = 205275 package_id = 248632 ):[Root @ localhost FFMPEG] # lsFfmpeg-laster.tar.gz2. decompress:[Root @ localhost FFMPEG] # tar zxvf

not contain timestamp information, but when we wait for the frame, it is not what we want ). However, the FFMPEG re-sorts the packages so that DTS of the packages processed by the avcodec_decode_video () function can always be the same as the PTS returned. However, another warning is that we do not always get this information. Don't worry, because there is another way to find the post pts, we can makeProgramSort the packages by yourself. We save th

whole process actually starts from the end of the function. Here we call the packet_queue_get () function. We retrieve the packet from the queue and save its information. Then, once we have a usable package, we call the avcodec_decode_audio2 () function, which functions like avcodec_decode_video, the only difference is that there may be more than one sound frame in a package, so you may need to call it many times to decode all the data in the package. At the same time, remember to forcibly