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地址: https://github.com/FFmpeg/FFmpeg
git clone https://github.com/FFmpeg/FFmpeg.git编译和安装
因为使用在板端编译#xff0c;因此没有使用交叉编译链的部分。将如下内容复制到… 目录 源码下载编译和安装API简单使用源代码编译运行 工具的简单使用学习论坛 源码下载
地址: https://github.com/FFmpeg/FFmpeg
git clone https://github.com/FFmpeg/FFmpeg.git编译和安装
因为使用在板端编译因此没有使用交叉编译链的部分。将如下内容复制到build.sh, 执行sh build.sh
./configure \--prefix$PWD/install \--enable-shared \--target-oslinux \--archaarch64 \--enable-gpl \--extra-libs-ldl \--extra-cflags-fPIC \--extra-ldflags-Wl,-Bsymbolic \--extra-libs-lpthread -lm
如果没有报错执行make -j4;make install 以上版本工具有ffmpeg和ffprobe接口在install目录下的include和lib
API简单使用
源代码
xxxxxxxxxxxxxxxxxxxx.hpp
#ifndef FILE_2_FRAME_H__
#define FILE_2_FRAME_H__#include thread
#include string
extern C {#include libavformat/avformat.h
}class CFile2Frame {
public:static constexpr char *RED_START (char*)\033[1;31m;static constexpr char *GREEN_START (char*)\033[1;32m;static constexpr char *COLOR_END (char*)\033[0m;typedef void (*func_data)(char*, int, void*pUser);public:CFile2Frame(const std::string filePath);~CFile2Frame();int start();int videoFormatConversion();void file2FrameExecLoop(void);void loop();static unsigned frameNo_;
private:bool isExit_;std::thread *pff_;func_data frameCb_;std::string strfileNamePath_;//ffmpegAVFormatContext *ic_{nullptr};AVDictionary *opts_{nullptr};AVPacket *pkt;bool initSucc ; /*初始化成功完成标志 读帧准备前的初始化*/int VideoStreamIndex_;};#endif xxxxxxxxxxxxxxxxxxxxx.cpp
#include iostream
#include unistd.h
#include stdlib.h
#include string.h#include file2Frame.hunsigned CFile2Frame::frameNo_0U;static void frameCallback(char *pdata, int size, void *pUser)
{if(pUser){// *this}printf(fn:%06d - frame_size:%d\n, CFile2Frame::frameNo_, size);}static double r2d(AVRational r)
{return r.den 0 ? 0 : r.num / r.den;
}CFile2Frame::CFile2Frame(const std::string filePath):frameCb_(frameCallback),pff_(nullptr), isExit_(false),strfileNamePath_(filePath),initSucc(false), VideoStreamIndex_(0){pff_ new std::thread(CFile2Frame::file2FrameExecLoop,this);if(!pff_){printf( create file2FrameExecLoop failure!!! \n);}}CFile2Frame::~CFile2Frame()
{isExit_ true;if(pkt){av_packet_free(pkt);if(nullptr ! ic_){avformat_close_input(ic_); ic_ nullptr;}}
}void CFile2Frame::file2FrameExecLoop(void){int ret 0;frameCb_ frameCallback;pkt av_packet_alloc();printf( 开始从%s文件中分离帧数据**** \n, strfileNamePath_.c_str());while(!isExit_){if(!ic_ || !initSucc){goto C;}ret av_read_frame(ic_, pkt);if(0 ! ret){std::cout RED_START Read Frame End! COLOR_END std::endl;;frameNo_ 0;getchar();int ms 3000;long long pos ms / 1000.0 * r2d(ic_-streams[pkt-stream_index]-time_base);av_seek_frame(ic_, VideoStreamIndex_, pos, AVSEEK_FLAG_BACKWARD |AVSEEK_FLAG_FRAME);continue;}static int frameNo 0;// if(pkt-stream_index VideoStreamIndex_ ){printf([No.%06d]size:%d\n, frameNo, pkt-size);};if(pkt-size){frameCb_( (char *)pkt-data, pkt-size, nullptr);}C:usleep(50*1000);av_packet_unref(pkt); //引用计数减1 为0时释放空间}}//build {g file2Frame.cpp -I include -I . -L ./lib -lavcodec -lavdevice -lavfilter -lavutil -lpostproc -lswscale -lavformat -lswresample -lpthread}
int CFile2Frame::start()
{av_dict_set(opts_, rtsp_transport, tcp, 0);av_dict_set(opts_, max_delay, 500, 0);int ret avformat_open_input(ic_, strfileNamePath_.c_str(), nullptr, opts_);if(0 ! ret){char buf[1024]{0};av_strerror(ret, buf, sizeof(buf)-1);std::cout file open failed: buf std::endl;return -1;}avformat_find_stream_info(ic_, nullptr);int nTime ic_-duration / AV_TIME_BASE;std::cout total time : nTime std::endl;av_dump_format(ic_, 0, nullptr, 0);for(unsigned int i 0; i ic_-nb_streams;i){AVStream *stream ic_-streams[i];//videoif(stream-codecpar-codec_type AVMediaType::AVMEDIA_TYPE_VIDEO){VideoStreamIndex_ i;printf([No.%d] {codecid:%d, w:%d,h:%d, format:%d}\n, i, stream-codecpar-codec_id,stream-codecpar-width, stream-codecpar-height, stream-codecpar-format);printf(fps:%d, size:%d\n, stream-avg_frame_rate, stream-codecpar-frame_size);printf(\n);}}VideoStreamIndex_ av_find_best_stream(ic_, AVMediaType::AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0); initSucc true;
}void CFile2Frame::loop()
{while(!isExit_){usleep(100*1000);}
}
int main(int argc, char *argv[])
{auto pInv std::make_sharedCFile2Frame(./blue.mp4);if(pInv){pInv-start();}pInv-loop();return 0;
}
编译
g file2Frame.cpp -I. -I include -L lib -lavcodec -lavdevice -lavfilter -lavformat -lavutil -lpostproc -lswresample -lswscale -lpthread
运行
开始从./blue.mp4文件中分离帧数据****
total time : 136
Input #0, mpeg, from (null):Duration: 00:02:16.76, start: 575.453000, bitrate: 3726 kb/sStream #0:0[0x1e0]: Video: h264 (Main), yuv420p(progressive), 1920x1080, 90k tbr, 90k tbn
[No.0] {codecid:27, w:1920,h:1080, format:0}
fps:0, size:0fn:000001 - frame_size:82093
fn:000002 - frame_size:22834
fn:000003 - frame_size:20793
fn:000004 - frame_size:19749
fn:000005 - frame_size:22469
fn:000006 - frame_size:18618
fn:000007 - frame_size:14481
fn:000008 - frame_size:18327
fn:000009 - frame_size:17599
fn:000010 - frame_size:17848
fn:000011 - frame_size:17835
fn:000012 - frame_size:18050
fn:000013 - frame_size:17740
fn:000014 - frame_size:17351
fn:000015 - frame_size:17392
fn:000016 - frame_size:17268
fn:000017 - frame_size:16904
fn:000018 - frame_size:16813
fn:000019 - frame_size:20473
fn:000020 - frame_size:17199
fn:000021 - frame_size:17412
fn:000022 - frame_size:17161
fn:000023 - frame_size:16997
fn:000024 - frame_size:16883
fn:000025 - frame_size:16717
fn:000026 - frame_size:16930
fn:000027 - frame_size:16866
fn:000028 - frame_size:16792
fn:000029 - frame_size:17012
fn:000030 - frame_size:20293
fn:000031 - frame_size:82470
fn:000032 - frame_size:22369
fn:000033 - frame_size:19886
fn:000034 - frame_size:19078
fn:000035 - frame_size:18911
fn:000036 - frame_size:18635工具的简单使用
参数说明-hhelp-t duration设置处理时间格式为hh:mm:ss-ss position设置起始时间格式为hh:mm:ss-b:v bitrate设置视频码率-b:a bitrate设置音频码率-r fps设置帧率-s wxh设置帧大小格式为WXH-c:v codec设置视频编码器-c:a codec设置音频编码器-ar freq设置音频采样率
MP4转MJPEG ./ffmpeg -i [你的mp4文件路径] -vf fps30 -q:v 9 out.mjpeg截取一段视频
ffmpeg -i blue.mp4 -ss 8 -t 3 -s 1280x720 -codec copy -f flv out.flv
-ss 开始时间set the start time offset单位秒-t 持续时间 -s 分辨率。截取原视频中从第8秒开始持续时间3秒的视频。输出分辨率1280x720解封装 ffmpeg -i blue.mp4 -codec copy -bsf: h264_mp4toannexb -f h264 out.264
-i blue.mp4 是输入的MP4文件-codec copy 从mp4中拷贝-bsf: h264_mp4toannexb 从mp4拷贝到annexB封装-f h264 采用h264格式out.264 输出的文件学习论坛
传送:https://superuser.com/questions/tagged/ffmpeg
