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【FFMPEG应用篇】MP4转YUV存储。

Windows摄像头采集编码

转码

FFmpeg

/** 一笑奈何* cn-yixiaonaihe.blog.youkuaiyun.com*/#include <iostream>#include <thread>extern "C" {#include "libavformat/avformat.h"#include "libavcodec/avcodec.h"#include "libswscale/swscale.h"#include "libswresample/swresample.h"}using.

项目采用工程模式进行构造。技术解决难点：1.编码后的PTS时间一定要赋值。2.音视频封装同步问题，其中涉及到PTS同步问题，例如视频25PTS/s 音频43PTS/s（44100采样率/1024每帧），音频要慢于视频所以这种情况下要进行PTS同步计算处理.主要代码如下XVideoWriter.h#pragma once#include<string>class AVPacket;enum XSAMPLEFMT{ X_S16 = 1, X_FLATP = 8}.

/** 一笑奈何* cn-yixiaonaihe.blog.youkuaiyun.com*/#include <iostream>#include <thread>extern "C" {#include "libavformat/avformat.h"#include "libavcodec/avcodec.h"#include "libswscale/swscale.h"#include "libswresample/swresample.h"}using.

#include <iostream>#include <thread>extern "C" {#include "libavformat/avformat.h"#include "libavcodec/avcodec.h"#include "libswscale/swscale.h"#include "libswresample/swresample.h"}using namespace std;static double r2d(AVRational r).

void SaveYUV420(AVFrame* Frameyuv){ //********************** 保存YUV数据 FILE *yuv_file = fopen("yuv_file", "ab"); if (yuv_file) { qDebug() << "OK-----------"; } char* buf = new char[Frameyuv->height * Frameyuv->width * 3 / 2]; memset.

头文件#pragma once#ifndef _VIDEO_DECODING_HEADER_#define _VIDEO_DECODING_HEADER_#define INBUF_SIZE 4096#define AUDIO_INBUF_SIZE 20480#define AUDIO_REFILL_THRESH 4096extern "C"{#include "lib...

#pragma once#include <QtWidgets/QWidget>#include "ui_ImageEn.h"#include<QDebug>#include<QByteArray>#include<QPainter>#include<QTimer>#include<QDateTime>extern "C"{#include"libavutil\imgutils.h"#include"liba.

/** 一笑奈何* cn-yixiaonaihe.blog.youkuaiyun.com*/#include <iostream>#include <thread>extern "C" {#include "libavformat/avformat.h"#include "libavcodec/avcodec.h"#include "libswscale/swscale.h"#include "libswresample/swresample.h"}using.

【代码】【FFMPEG应用篇】（一）yuv图片编码h264。

对于PTS和DTS 是两个非常重要的参数，在音视频同步时是必要的，为了方便使用，将二者统一为毫秒级别static double r2d(AVRational r){ return r.den == 0 ? 0 : (double)r.num / (double)r.den;}//转换为毫秒，方便做同步AVPacket->pts * (r2d(ic->streams[pkt->stream_index]->time_base) * 1000) ...

启动管理员权限suLinux 安装GL库 ，root身份权限运行sudo apt-get install libgl1-mesa-dev安装失败删除rm /var/lib/dpkg/lock再安装apt-get inastall g++ make安装gitsudo apt-get install git下载源码git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg安装FFMPEG依赖包进入FFMEPG源码文件目录cd .

int av_read_frame(AVFormatContext *s, AVPacket *pkt){ const int genpts = s->flags & AVFMT_FLAG_GENPTS; int eof = 0; int ret; AVStream *st; if (!genpts) { ret = s->internal->packet_buffer ? ff_packet.

av_packet_unref该接口使用了如下调用,该接口主要作用是清理AVPacket中的所有空间数据，清理完毕后进行初始化操作，并且将 data 与 size 置为0，方便下次调用。void av_packet_unref(AVPacket *pkt){ av_packet_free_side_data(pkt); av_buffer_unref(&pkt->buf); av_init_packet(pkt); pkt->data = NU

关于void *av_malloc(size_t size)可以参考av_mallocav_packet_alloc实际是分配AVPacket以后，调用av_init_packet对AVPacket的成员变量进行初始化赋值。AVPacket *av_packet_alloc(void){ AVPacket *pkt = av_mallocz(sizeof(AVPacket)); if (!pkt) return pkt; av_init_packet

void *av_malloc(size_t size){ void *ptr = NULL; //max_aloc_size Ϊ 2147483647 if (size > max_alloc_size) return NULL;#if HAVE_POSIX_MEMALIGN if (size) //OS X on SDK 10.6 has a broken posix_memalign implementation if (posix_.

1.首先选择Windows平台安装好环境windows搭建gcc开发环境(msys2)2.创建一个通用脚本

apt-get install -y makeapt-get install -y unzipcd /rootwget https://dl.google.com/android/repository/android-ndk-r14b-linux-x86_64.zipwget http://ffmpeg.org/releases/ffmpeg-3.4.tar.bz2unzip android-ndk-r14b-linux-x86_64.ziptar -xvf ffmpeg-3.4.tar.bz.

options

avformat_open_input打开媒体函数，先上全部源码。然后逐语句分析。int avformat_open_input(AVFormatContext **ps, const char *filename, ff_const59 AVInputFormat *fmt, AVDictionary **options){ //第一部分解析 AVFormatContext *s = *ps; int i, ret =..