ffmpeg实现视频合并

1、概述

简单说下流程：

打开输入---->打开输出---->根据输入来创建流---->拷贝流设置---->循环读帧---->判断第一个读完，改输入为第二个---->设置pts和dts---->写入---->善后

2、代码

/**最简单的视频合并*缪国凯 Mickel*[e-mail]*本程序实现把2个视频合并为一个视频，不涉及编解码，但是对视频源有要求，必须是相同的参数*着重理解第二个视频开始的时候的pts和dts计算*注：只处理一个视频流和一个音频流，若流多了，估计会crash*2015-5-14*/#include "stdafx.h"#ifdef __cplusplusextern"C"{#endif#include <libavformat/avformat.h>#include "libavcodec/avcodec.h"#include "libavfilter/avfiltergraph.h"#include "libavfilter/buffersink.h"#include "libavfilter/buffersrc.h"#include "libavutil/avutil.h"#include "libavutil/opt.h"#include "libavutil/pixdesc.h"#include "libswresample\swresample.h"#include "libavutil\fifo.h"#include "libavutil/audio_fifo.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, "postproc.lib")#pragma comment(lib, "swresample.lib")//#pragma comment(lib, "swscale.lib")#ifdef __cplusplus};#endifAVFormatContext *in1_fmtctx = NULL, *in2_fmtctx = NULL, *out_fmtctx = NULL;AVStream *out_video_stream = NULL, *out_audio_stream = NULL;int video_stream_index = -1, audio_stream_index = -1;int open_input(const char * in1_name, const char * in2_name){int ret = -1;if ((ret = avformat_open_input(&in1_fmtctx, in1_name, NULL, NULL)) < 0){printf("can not open the first input context!\n");return ret;}if ((ret = avformat_find_stream_info(in1_fmtctx, NULL)) < 0){printf("can not find the first input stream info!\n");return ret;}if ((ret = avformat_open_input(&in2_fmtctx, in2_name, NULL, NULL)) < 0){printf("can not open the first input context!\n");return ret;}if ((ret = avformat_find_stream_info(in2_fmtctx, NULL)) < 0){printf("can not find the second input stream info!\n");return ret;}}int open_output(const char * out_name){int ret = -1;if ((ret = avformat_alloc_output_context2(&out_fmtctx, NULL, NULL, out_name)) < 0){printf("can not alloc context for output!\n");return ret;}//new stream for out putfor (int i = 0; i < in1_fmtctx->nb_streams; i++){if (in1_fmtctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO){video_stream_index = i;out_video_stream = avformat_new_stream(out_fmtctx, NULL);if (!out_video_stream){printf("Failed allocating output1 video stream\n");ret = AVERROR_UNKNOWN;return ret;}if ((ret = avcodec_copy_context(out_video_stream->codec, in1_fmtctx->streams[i]->codec)) < 0){printf("can not copy the video codec context!\n");return ret;}out_video_stream->codec->codec_tag = 0;if(out_fmtctx->oformat->flags & AVFMT_GLOBALHEADER){out_video_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;}}else if (in1_fmtctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO){audio_stream_index = i;out_audio_stream = avformat_new_stream(out_fmtctx, NULL);if (!out_audio_stream){printf("Failed allocating output1 video stream\n");ret = AVERROR_UNKNOWN;return ret;}if ((ret = avcodec_copy_context(out_audio_stream->codec, in1_fmtctx->streams[i]->codec)) < 0){printf("can not copy the video codec context!\n");return ret;}out_audio_stream->codec->codec_tag = 0;if(out_fmtctx->oformat->flags & AVFMT_GLOBALHEADER){out_audio_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;}}}//open output fileif (!(out_fmtctx->oformat->flags & AVFMT_NOFILE)){if ((ret = avio_open(&out_fmtctx->pb, out_name, AVIO_FLAG_WRITE)) < 0){printf("can not open the out put file handle!\n");return ret;}}//write out  file headerif ((ret = avformat_write_header(out_fmtctx, NULL)) < 0){printf( "Error occurred when opening video output file\n");return ret;}}int _tmain(int argc, _TCHAR* argv[]){if(argc < 4){printf("no input file!\n");return -1;}char out_name[20];sprintf(out_name, "combine.%s", argv[3]);av_register_all();if (0 > open_input(argv[1], argv[2])){goto end;}if(0 > open_output(out_name)){goto end;}AVFormatContext *input_ctx = in1_fmtctx;AVPacket pkt;int pts_v, pts_a, dts_v, dts_a;while(1){if(0 > av_read_frame(input_ctx, &pkt)){if (input_ctx == in1_fmtctx){float vedioDuraTime, audioDuraTime;//calc the first media dura timevedioDuraTime = ((float)input_ctx->streams[video_stream_index]->time_base.num / (float)input_ctx->streams[video_stream_index]->time_base.den) * ((float)pts_v);audioDuraTime = ((float)input_ctx->streams[audio_stream_index]->time_base.num / (float)input_ctx->streams[audio_stream_index]->time_base.den) * ((float)pts_a);//calc the pts and dts end of the first mediaif (audioDuraTime > vedioDuraTime){dts_v = pts_v = audioDuraTime / ((float)input_ctx->streams[video_stream_index]->time_base.num / (float)input_ctx->streams[video_stream_index]->time_base.den);dts_a++;pts_a++;}else{dts_a = pts_a = vedioDuraTime / ((float)input_ctx->streams[audio_stream_index]->time_base.num / (float)input_ctx->streams[audio_stream_index]->time_base.den);dts_v++;pts_v++;}input_ctx = in2_fmtctx;continue;}break;}if (pkt.stream_index == video_stream_index){if (input_ctx == in2_fmtctx){pkt.pts += pts_v;pkt.dts += dts_v;}else{pts_v = pkt.pts;dts_v = pkt.dts;}}else if (pkt.stream_index == audio_stream_index){if (input_ctx == in2_fmtctx){pkt.pts += pts_a;pkt.dts += dts_a;}else{pts_a = pkt.pts;dts_a = pkt.dts;}}pkt.pts = av_rescale_q_rnd(pkt.pts, input_ctx->streams[pkt.stream_index]->time_base, out_fmtctx->streams[pkt.stream_index]->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));pkt.dts = av_rescale_q_rnd(pkt.dts, input_ctx->streams[pkt.stream_index]->time_base, out_fmtctx->streams[pkt.stream_index]->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));pkt.pos = -1;if (av_interleaved_write_frame(out_fmtctx, &pkt) < 0) {printf( "Error muxing packet\n");//break;}av_free_packet(&pkt);}av_write_trailer(out_fmtctx);end:avformat_close_input(&in1_fmtctx);avformat_close_input(&in2_fmtctx);/* close output */if (out_fmtctx && !(out_fmtctx->oformat->flags & AVFMT_NOFILE))avio_close(out_fmtctx->pb);avformat_free_context(out_fmtctx);return 0;}

3、下载地址

http://download.csdn.net/detail/dancing_night/8700439