ffmpeg合并视频api实现
来源：互联网 发布：买车票的软件 编辑：程序博客网 时间：2024/05/17 06:01
后来改成用命令行实现了，代码就扔这里吧
#define __STDC_CONSTANT_MACROS#ifdef _WIN32//Windowsextern "C"{#include "libavformat/avformat.h"};#else//Linux...#ifdef __cplusplusextern "C"{#endif#include <libavformat/avformat.h>#ifdef __cplusplus};#endif#endif/* FIX: H.264 in some container format (FLV, MP4, MKV etc.) need "h264_mp4toannexb" bitstream filter (BSF) *Add SPS,PPS in front of IDR frame *Add start code ("0,0,0,1") in front of NALU H.264 in some container (MPEG2TS) don't need this BSF. *///'1': Use H.264 Bitstream Filter#define USE_H264BSF 0/* FIX:AAC in some container format (FLV, MP4, MKV etc.) need "aac_adtstoasc" bitstream filter (BSF) *///'1': Use AAC Bitstream Filter#define USE_AACBSF 0#include <libavcodec/avcodec.h>#include <libavformat/avformat.h>#include <libswscale/swscale.h>- (void)cancatVideo { AVOutputFormat *ofmt = NULL; //Input AVFormatContext and Output AVFormatContext AVFormatContext *ofmt_ctx = NULL; AVFormatContext *ifmt_ctx_array[30] = {0}; AVPacket pkt; char in_filename[500]={0}; char out_filename[500]={0}; int ret, i; int frame_index=0; NSString *fileName; NSString *videoPath; NSMutableArray *input_array = [[NSMutableArray alloc] init]; for (id object in _array) { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); videoPath = [NSString stringWithFormat:@"%@/%@",[paths objectAtIndex:0],[object objectForKey:@"video_id"]]; [input_array addObject:videoPath]; } // NSString *input_str= @"resource.bundle/1450954312111_c.mp4"; // NSString *input_str2= @"resource.bundle/1450925430841_c.mp4"; // NSString *input_str3= @"resource.bundle/1451049906063_c.mp4"; av_register_all(); i=0; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *output_nsstr = [NSString stringWithFormat:@"%@/haoba.mp4",[paths objectAtIndex:0]]; sprintf(out_filename,"%s",[output_nsstr UTF8String]); for (id object in input_array) { NSString *input_nsstr = object; sprintf(in_filename,"%s",[input_nsstr UTF8String]); if(![[NSFileManager defaultManager] fileExistsAtPath:input_nsstr]) { printf( "文件不存在\n"); } else { printf( "文件是存在的\n"); } if ((ret = avformat_open_input(&ifmt_ctx_array[i], in_filename, 0, 0)) < 0) { printf( "Could not open input file.%s",in_filename); goto end; } if ((ret = avformat_find_stream_info(ifmt_ctx_array[i], 0)) < 0) { printf( "Failed to retrieve input stream information"); goto end; } i++; } //Output avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename); if (!ofmt_ctx) { printf( "Could not create output context\n"); ret = AVERROR_UNKNOWN; goto end; } ofmt = ofmt_ctx->oformat; for (i = 0; i < ifmt_ctx_array[0]->nb_streams; i++) { //Create output AVStream according to input AVStream AVStream *in_stream = ifmt_ctx_array[0]->streams[i]; AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec); if (!out_stream) { printf( "Failed allocating output stream\n"); ret = AVERROR_UNKNOWN; goto end; } //Copy the settings of AVCodecContext if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) { printf( "Failed to copy context from input to output stream codec context\n"); goto end; } out_stream->codec->codec_tag = 0; if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER; } //Output information------------------ av_dump_format(ofmt_ctx, 0, out_filename, 1); //Open output file if (!(ofmt->flags & AVFMT_NOFILE)) { ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE); if (ret < 0) { printf( "Could not open output file '%s'", out_filename); goto end; } } //Write file header if (avformat_write_header(ofmt_ctx, NULL) < 0) { printf( "Error occurred when opening output file\n"); goto end; } AVFormatContext *input_ctx = ifmt_ctx_array[0]; //AVPacket pkt; int pts_v = 0, pts_a = 0, dts_v = 0, dts_a = 0; float vedioDuraTime = 0.0, audioDuraTime = 0.0; int pts_v_temp = 0, pts_a_temp = 0, dts_v_temp = 0, dts_a_temp = 0; int vedioIndex = 0; while (1) { AVStream *in_stream, *out_stream; //Get an AVPacket ret = av_read_frame(input_ctx, &pkt); if (ret < 0) { if (input_ctx != ifmt_ctx_array[input_array.count-1]) { //calc the first media dura time vedioDuraTime = ((float)input_ctx->streams[0]->time_base.num / (float)input_ctx->streams[0]->time_base.den) * ((float)pts_v); audioDuraTime = ((float)input_ctx->streams[1]->time_base.num / (float)input_ctx->streams[1]->time_base.den) * ((float)pts_a); printf("\nvedioDuraTime=%f\naudioDuraTime=%f\n",vedioDuraTime,audioDuraTime); // pts_v_temp += pts_v; // pts_v_temp+=1024; // dts_v_temp = pts_v_temp; // printf("\npts_v_temp=%d\npts_v_temp=%d\n",pts_v_temp,dts_v_temp); //vedioDuraTime++; //audioDuraTime++; //calc the pts and dts end of the first media if (audioDuraTime > vedioDuraTime) { dts_v = pts_v = audioDuraTime / ((float)input_ctx->streams[0]->time_base.num / (float)input_ctx->streams[0]->time_base.den); printf("\ndts_v=%d\npts_v=%d\n",dts_v,pts_v); printf("\ndts_a=%d\npts_a=%d\n",dts_a,pts_a); pts_v_temp+= pts_v; //pts_v_temp+=512; dts_v_temp = pts_v_temp; pts_a_temp+=pts_a; pts_a_temp+=1024; dts_a_temp=pts_a_temp; printf("\ndts_v=%d\npts_v=%d\n",dts_v,pts_v); printf("\ndts_a=%d\npts_a=%d\n",dts_a,pts_a); } else { dts_a = pts_a = vedioDuraTime / ((float)input_ctx->streams[1]->time_base.num / (float)input_ctx->streams[1]->time_base.den); printf("\nnonononodts_a=%d\npts_a=%d\n",dts_a,pts_a); pts_v_temp+= pts_v; pts_v_temp+=1024; dts_v_temp = pts_v_temp; pts_a_temp+=pts_a; pts_a_temp+=2048; dts_a_temp=pts_a_temp; printf("\nnonononodts_a=%d\npts_a=%d\n",dts_a,pts_a); } vedioIndex++; input_ctx = ifmt_ctx_array[vedioIndex]; continue; } break; } in_stream = input_ctx->streams[pkt.stream_index]; out_stream = ofmt_ctx->streams[pkt.stream_index]; if (pkt.stream_index == 0) {printf("\npkt.pts=%lld\npkt.dts=%lld\n",pkt.pts,pkt.dts); { pts_v = pkt.pts; dts_v = pkt.dts; printf("\n============pts_v=%d\ndts_v=%d\n",pts_v,dts_v); } if (input_ctx != ifmt_ctx_array[0]) { pkt.pts += pts_v_temp; pkt.dts += dts_v_temp; printf("\n============pts_v=%d\ndts_v=%d\n",pts_v,dts_v); } } else if (pkt.stream_index == 1) { { pts_a = pkt.pts; dts_a = pkt.dts; printf("\n============pts_a=%d\ndts_a=%d\n",pts_a,dts_a); } if (input_ctx != ifmt_ctx_array[0]) { pkt.pts += pts_a_temp; pkt.dts += dts_a_temp; printf("\n============pts_a=%d\ndts_a=%d\n",pts_a,dts_a); } } // printf("\npkt.pts=%lld\npkt.dts=%lld\n",pkt.pts,pkt.dts); //Convert PTS/DTS pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX)); pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX)); //pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base); pkt.pos = -1; //Write if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) { printf( "Error muxing packet\n"); //break; } printf("Write %8d frames to output file\n",frame_index); av_free_packet(&pkt); frame_index++; } //Write file trailer av_write_trailer(ofmt_ctx);end: for (int i = 0; i<input_array.count; i++) { avformat_close_input(&ifmt_ctx_array[i]); } /* close output */ if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE)) avio_close(ofmt_ctx->pb); avformat_free_context(ofmt_ctx); } 0 0
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