ffmpeg录制桌面

最新推荐文章于 2024-08-19 14:34:01 发布

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最新推荐文章于 2024-08-19 14:34:01 发布 · 974 阅读

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#ffmpeg

vs版本:2017
ffmpeg版本号：
ffmpeg version N-102642-g864d1ef2fc Copyright © 2000-2021 the FFmpeg developers
built with gcc 8.1.0 (x86_64-win32-seh-rev0, Built by MinGW-W64 project)
configuration: --arch=x86_64 --prefix=/home/ffmpeg_static_x64 --disable-debug
libavutil 57. 0.100 / 57. 0.100
libavcodec 59. 1.100 / 59. 1.100
libavformat 59. 2.101 / 59. 2.101
libavdevice 59. 0.100 / 59. 0.100
libavfilter 8. 0.101 / 8. 0.101
libswscale 6. 0.100 / 6. 0.100
libswresample 4. 0.100 / 4. 0.100

关于ffmpeg的lib和dll，本人在csdn上上传了相关资源，并且免费下载。

桌面录制时，发现有一些暂不了解的地方，比如avformat_write_header后，time_base发生了改变，这个使得av_packet_rescale_ts(&packet, pCodecCtx_Video->time_base, pFormatCtx_Out->streams[0]->time_base);这句特别重要，若没这句，视频播放速度可能会很快。
今天先在此记录，后面若有其他发现，会继续更新此博客。
代码如下：

// FfmpegTest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Windows.h>
#include <conio.h>

#ifdef	__cplusplus

extern "C"
{
   
   
#endif
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavdevice/avdevice.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/imgutils.h"

#pragma comment(lib, "avcodec.lib")
#pragma comment(lib, "avformat.lib")
#pragma comment(lib, "avutil.lib")
#pragma comment(lib, "avdevice.lib")
#pragma comment(lib, "avfilter.lib")

	//#pragma comment(lib, "avfilter.lib")
	//#pragma comment(lib, "postproc.lib")
	//#pragma comment(lib, "swresample.lib")
#pragma comment(lib, "swscale.lib")
#ifdef __cplusplus
};
#endif

AVFormatContext	*pFormatCtx_Video = NULL, *pFormatCtx_Out = NULL;
AVCodecContext	*pCodecCtx_Video = NULL;
AVCodec			*pCodec_Video = NULL;
AVFifoBuffer	*fifo_video = NULL;
int VideoIndex;


AVCodecContext	*pCodecEncodeCtx_Video = NULL;
AVCodec			*pCodecEncode_Video = NULL;




SwsContext *img_convert_ctx;
int frame_size = 0;

uint8_t *picture_buf = NULL, *frame_buf = NULL;

bool bCap = true;

DWORD WINAPI ScreenCapThreadProc(LPVOID lpParam);



int OpenVideoCapture()
{
   
   
	const AVInputFormat *ifmt = av_find_input_format("gdigrab");
	//这里可以加参数打开，例如可以指定采集帧率
	AVDictionary *options = NULL;
	av_dict_set(&options, "framerate", "25", NULL);
	av_dict_set(&options, "probesize", "50000000", NULL);
	//av_dict_set(&options,"offset_x","20",0);
	//The distance from the top edge of the screen or desktop
	//av_dict_set(&options,"offset_y","40",0);
	//Video frame size. The default is to capture the full screen
	//av_dict_set(&options,"video_size","320x240",0);
	if (avformat_open_input(&pFormatCtx_Video, "desktop", ifmt, &options) != 0)
	{
   
   
		printf<