项目Go与ffmpeg-20131017-git-0bf8580结合过程
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1.在项目Go中新建一个类CStreamToMp4，然后仿照FFmpeg的例子程序来写。
StreamToMp4.h
#pragma once#include <stdlib.h>#include <stdio.h>#include <string.h>#include <math.h>#ifdef __cplusplusextern "C" {#endif#include <libavcodec/avcodec.h>#include <libavutil/mem.h>#include <libavutil/opt.h>#include <libavutil/mathematics.h>#include <libavformat/avformat.h>#include <libswscale/swscale.h>#include <libswresample/swresample.h>#include <libavutil/imgutils.h>#ifdef __cplusplus}#endif#pragma comment(lib,"avcodec.lib")#pragma comment(lib,"avformat.lib")#pragma comment(lib,"avutil.lib")#pragma comment(lib,"swscale.lib")#pragma comment(lib,"avfilter.lib")#pragma comment(lib,"postproc.lib")#pragma comment(lib,"swresample.lib")#pragma comment(lib,"avdevice.lib")/* 5 seconds stream duration */#define STREAM_DURATION 22.0#define STREAM_FRAME_RATE 25 /* 25 images/s */#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */#define BUF_SIZE 4096*500class C264ToMp4{public:C264ToMp4(void);~C264ToMp4(void);int open_codec_context(int *stream_idx,AVFormatContext *fmt_ctx, enum AVMediaType type);AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,enum AVCodecID codec_id);void open_audio(AVFormatContext *oc, AVCodec *codec, AVStream *st);void get_audio_frame(int16_t *samples, int frame_size, int nb_channels);void write_audio_frame(AVFormatContext *oc, AVStream *st);void close_audio(AVFormatContext *oc, AVStream *st);void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st);void write_video_frame(AVFormatContext *oc, AVStream *st);void close_video(AVFormatContext *oc, AVStream *st);//int nal_to_mp4file(BYTE* pVideo,int len);//static int read_data(void* opaque, uint8_t *buf, int buf_size);int h264FileToMp4();private:AVFormatContext *input_fmt_ctx;int sws_flag;AVPacket input_pkt;int video_stream_idx;uint8_t *video_dst_data[4];int video_dst_linesize[4];AVStream *input_video_stream;AVFrame *input_frame;AVCodecContext *video_dec_ctx;int video_dst_bufsize;float t, tincr, tincr2;uint8_t **src_samples_data;int src_samples_linesize;int src_nb_samples;int max_dst_nb_samples;uint8_t **dst_samples_data;int dst_samples_linesize;int dst_samples_size;struct SwrContext *swr_ctx;AVFrame *frame;AVPicture src_picture, dst_picture;int frame_count;};#include "stdafx.h"#include "StreamToMp4.h"C264ToMp4::C264ToMp4(void){//AVFormatContext *input_fmt_ctx = NULL;int sws_flag = SWS_BICUBIC;//AVPacket input_pkt;int video_stream_idx = -1;uint8_t *video_dst_data[4] = {NULL};//int video_dst_linesize[4];//AVStream *input_video_stream;//AVFrame *input_frame;AVCodecContext *video_dec_ctx = NULL;//int video_dst_bufsize;//float t, tincr, tincr2;//uint8_t **src_samples_data;//int src_samples_linesize;//int src_nb_samples;//int max_dst_nb_samples;//uint8_t **dst_samples_data;//int dst_samples_linesize;//int dst_samples_size;struct SwrContext *swr_ctx = NULL;//AVFrame *frame;//AVPicture src_picture, dst_picture;//int frame_count;}C264ToMp4::~C264ToMp4(void){}int C264ToMp4::open_codec_context(int *stream_idx, AVFormatContext *fmt_ctx, enum AVMediaType type){ int ret; AVStream *st; AVCodecContext *dec_ctx = NULL; AVCodec *dec = NULL; ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0); if (ret < 0) { return ret; } else { *stream_idx = ret; st = fmt_ctx->streams[*stream_idx]; /* find decoder for the stream */ dec_ctx = st->codec; dec = avcodec_find_decoder(dec_ctx->codec_id); if (!dec) { fprintf(stderr, "Failed to find %s codec\n", av_get_media_type_string(type)); return ret; } if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0) { fprintf(stderr, "Failed to open %s codec\n", av_get_media_type_string(type)); return ret; } } return 0;}/* Add an output stream. */AVStream * C264ToMp4::add_stream(AVFormatContext *oc, AVCodec **codec, enum AVCodecID codec_id){ AVCodecContext *c; AVStream *st; /* find the encoder */ *codec = avcodec_find_encoder(codec_id); if (!(*codec)) { fprintf(stderr, "Could not find encoder for '%s'\n", avcodec_get_name(codec_id)); exit(1); } st = avformat_new_stream(oc, *codec); if (!st) { fprintf(stderr, "Could not allocate stream\n"); exit(1); } st->id = oc->nb_streams-1; c = st->codec; switch ((*codec)->type) { case AVMEDIA_TYPE_AUDIO: c->sample_fmt = AV_SAMPLE_FMT_FLTP; c->bit_rate = 64000; c->sample_rate = 44100; c->channels = 2; break; case AVMEDIA_TYPE_VIDEO: c->codec_id = codec_id; c->bit_rate = 400000; c->time_base.den = STREAM_FRAME_RATE; c->time_base.num = 1; c->gop_size = 12; c->pix_fmt = STREAM_PIX_FMT; break; default: break; } /* Some formats want stream headers to be separate. */ if (oc->oformat->flags & AVFMT_GLOBALHEADER) c->flags |= CODEC_FLAG_GLOBAL_HEADER; return st;}/**************************************************************//* audio output */void C264ToMp4::open_audio(AVFormatContext *oc, AVCodec *codec, AVStream *st){ AVCodecContext *c; int ret; c = st->codec; /* open it */ ret = avcodec_open2(c, codec, NULL); if (ret < 0) { //fprintf(stderr, "Could not open audio codec: %s\n", av_err2str(ret)); fprintf(stderr, "Could not open audio codec: \n"); exit(1); } /* init signal generator */ t = 0; tincr = 2 * M_PI * 110.0 / c->sample_rate; /* increment frequency by 110 Hz per second */ tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate; src_nb_samples = c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE ? 10000 : c->frame_size; ret = av_samples_alloc_array_and_samples(&src_samples_data, &src_samples_linesize, c->channels, src_nb_samples, c->sample_fmt, 0); if (ret < 0) { fprintf(stderr, "Could not allocate source samples\n"); exit(1); } /* create resampler context */ if (c->sample_fmt != AV_SAMPLE_FMT_S16) { swr_ctx = swr_alloc(); if (!swr_ctx) { fprintf(stderr, "Could not allocate resampler context\n"); exit(1); } /* set options */ av_opt_set_int (swr_ctx, "in_channel_count", c->channels, 0); av_opt_set_int (swr_ctx, "in_sample_rate", c->sample_rate, 0); av_opt_set_sample_fmt(swr_ctx, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0); av_opt_set_int (swr_ctx, "out_channel_count", c->channels, 0); av_opt_set_int (swr_ctx, "out_sample_rate", c->sample_rate, 0); av_opt_set_sample_fmt(swr_ctx, "out_sample_fmt", c->sample_fmt, 0); /* initialize the resampling context */ if ((ret = swr_init(swr_ctx)) < 0) { fprintf(stderr, "Failed to initialize the resampling context\n"); exit(1); } } /* compute the number of converted samples: buffering is avoided * ensuring that the output buffer will contain at least all the * converted input samples */ max_dst_nb_samples = src_nb_samples; ret = av_samples_alloc_array_and_samples(&dst_samples_data, &dst_samples_linesize, c->channels, max_dst_nb_samples, c->sample_fmt, 0); if (ret < 0) { fprintf(stderr, "Could not allocate destination samples\n"); exit(1); } dst_samples_size = av_samples_get_buffer_size(NULL, c->channels, max_dst_nb_samples, c->sample_fmt, 0);}/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and* 'nb_channels' channels. */void C264ToMp4::get_audio_frame(int16_t *samples, int frame_size, int nb_channels){ int j, i, v; int16_t *q; q = samples; for (j = 0; j < frame_size; j++) { v = (int)(sin(t) * 10000); for (i = 0; i < nb_channels; i++) *q++ = v; t += tincr; tincr += tincr2; }}void C264ToMp4::write_audio_frame(AVFormatContext *oc, AVStream *st){ AVCodecContext *c; AVPacket pkt = { 0 }; // data and size must be 0; AVFrame *frame = avcodec_alloc_frame(); int got_packet, ret, dst_nb_samples; av_init_packet(&pkt); c = st->codec; get_audio_frame((int16_t *)src_samples_data[0], src_nb_samples, c->channels); /* convert samples from native format to destination codec format, using the resampler */ if (swr_ctx) { /* compute destination number of samples */ dst_nb_samples = av_rescale_rnd(swr_get_delay(swr_ctx, c->sample_rate) + src_nb_samples, c->sample_rate, c->sample_rate, AV_ROUND_UP); if (dst_nb_samples > max_dst_nb_samples) { av_free(dst_samples_data[0]); ret = av_samples_alloc(dst_samples_data, &dst_samples_linesize, c->channels, dst_nb_samples, c->sample_fmt, 0); if (ret < 0) exit(1); max_dst_nb_samples = dst_nb_samples; dst_samples_size = av_samples_get_buffer_size(NULL, c->channels, dst_nb_samples, c->sample_fmt, 0); } /* convert to destination format */ ret = swr_convert(swr_ctx, dst_samples_data, dst_nb_samples, (const uint8_t **)src_samples_data, src_nb_samples); if (ret < 0) { fprintf(stderr, "Error while converting\n"); exit(1); } } else { dst_samples_data[0] = src_samples_data[0]; dst_nb_samples = src_nb_samples; } frame->nb_samples = dst_nb_samples; avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt, dst_samples_data[0], dst_samples_size, 0); ret = avcodec_encode_audio2(c, &pkt, frame, &got_packet); if (ret < 0) { //fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret)); fprintf(stderr, "Error encoding audio frame:\n"); exit(1); } if (!got_packet) return; pkt.stream_index = st->index; /* Write the compressed frame to the media file. */ ret = av_interleaved_write_frame(oc, &pkt); if (ret != 0) { //fprintf(stderr, "Error while writing audio frame: %s\n", // av_err2str(ret)); fprintf(stderr, "Error while writing audio frame: \n"); exit(1); } avcodec_free_frame(&frame);}void C264ToMp4::close_audio(AVFormatContext *oc, AVStream *st){ avcodec_close(st->codec); av_free(src_samples_data[0]); av_free(dst_samples_data[0]);}/* video output */void C264ToMp4::open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st){ int ret; AVCodecContext *c = st->codec; /* open the codec */ ret = avcodec_open2(c, codec, NULL); if (ret < 0) { //fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret)); fprintf(stderr, "Could not open video codec: \n"); exit(1); } /* allocate and init a re-usable frame */ frame = avcodec_alloc_frame(); if (!frame) { fprintf(stderr, "Could not allocate video frame\n"); exit(1); } /* Allocate the encoded raw picture. */ ret = avpicture_alloc(&dst_picture, c->pix_fmt, c->width, c->height); if (ret < 0) { //fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret)); fprintf(stderr, "Could not allocate picture: \n"); exit(1); } /* If the output format is not YUV420P, then a temporary YUV420P * picture is needed too. It is then converted to the required * output format. */ if (c->pix_fmt != AV_PIX_FMT_YUV420P) { ret = avpicture_alloc(&src_picture, AV_PIX_FMT_YUV420P, c->width, c->height); if (ret < 0) { fprintf(stderr, "Could not allocate temporary picture:\n");//fprintf(stderr, "Could not allocate temporary picture: %s\n",//av_err2str(ret)); exit(1); } } /* copy data and linesize picture pointers to frame */ *((AVPicture *)frame) = dst_picture;}void C264ToMp4::write_video_frame(AVFormatContext *oc, AVStream *st){ int ret; static struct SwsContext *sws_ctx; AVCodecContext *c = st->codec; // fill_yuv_image(&dst_picture, frame_count, c->width, c->height); if (oc->oformat->flags & AVFMT_RAWPICTURE) { /* Raw video case - directly store the picture in the packet */ AVPacket pkt; av_init_packet(&pkt); pkt.flags |= AV_PKT_FLAG_KEY; pkt.stream_index = st->index; pkt.data = dst_picture.data[0]; pkt.size = sizeof(AVPicture); ret = av_interleaved_write_frame(oc, &pkt); } else { AVPacket pkt = { 0 }; int got_packet; av_init_packet(&pkt); /* encode the image */ ret = avcodec_encode_video2(c, &pkt, frame, &got_packet); if (ret < 0) { //fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret)); fprintf(stderr, "Error encoding video frame: \n"); exit(1); } /* If size is zero, it means the image was buffered. */ if (!ret && got_packet && pkt.size) { pkt.stream_index = st->index; /* Write the compressed frame to the media file. */ ret = av_interleaved_write_frame(oc, &pkt); } else { ret = 0; } } if (ret != 0) { //fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret)); fprintf(stderr, "Error while writing video frame: \n"); exit(1); } frame_count++;}void C264ToMp4::close_video(AVFormatContext *oc, AVStream *st){ avcodec_close(st->codec); //av_free(src_picture.data[0]); //av_free(dst_picture.data[0]); av_free(frame);}//int C264ToMp4::read_data(void* opaque, uint8_t *buf, int buf_size)//{//struct buffer_data *bd = (struct buffer_data *)opaque;//buf_size = FFMIN(buf_size, bd->size);//printf("ptr:%p size:%d\n", bd->ptr, bd->size);///* copy internal buffer data to buf *///memcpy(buf, bd->ptr, buf_size);//bd->ptr += buf_size;//bd->size -= buf_size;//return buf_size;//}//int C264ToMp4::nal_to_mp4file(BYTE* pVideo,int len)//{//uint8_t *buf = (uint8_t*)av_malloc(sizeof(uint8_t)*BUF_SIZE);//AVCodec *video_codec, *audio_codec;//AVCodecContext *pVideoCodecCtx = NULL;//AVCodecContext *pAudioCodecCtx = NULL;//AVIOContext * pb = NULL;//AVInputFormat *piFmt = NULL;//AVOutputFormat *fmt = NULL;//AVFormatContext *oc= NULL;//const char* filename = "264ToMp4.mp4";//AVStream *audio_st, *video_st;//struct buffer_data bd = {0};//int ret;//int decoded;//int got_frame;//double audio_time, video_time;//////av_register_all();////bd.ptr = pVideo;//bd.size = len;//////step1:申请一个AVIOContext//pb = avio_alloc_context(buf, BUF_SIZE, 0, NULL, read_data, NULL, NULL);//if (!pb) {//fprintf(stderr, "avio alloc failed!\n");////return -1;//}////step2:探测流格式//if (av_probe_input_buffer(pb, &piFmt, "", NULL, 0, 0) < 0) {//fprintf(stderr, "probe failed!\n");////return -1;//} else {//fprintf(stdout, "probe success!\n");//fprintf(stdout, "format: %s[%s]\n", piFmt->name, piFmt->long_name);//}////input_fmt_ctx = avformat_alloc_context();//input_fmt_ctx->pb = pb;//step3:这一步很关键////step4:打开流//if (avformat_open_input(&input_fmt_ctx, "", piFmt, NULL) < 0) {//fprintf(stderr, "avformat open failed.\n");////return -1;//} else {//fprintf(stdout, "open stream success!\n");//}////以下就和文件处理一致了//if (av_find_stream_info(input_fmt_ctx) < 0) {//fprintf(stderr, "could not fine stream.\n");////return -1;//}////if (open_codec_context(&video_stream_idx, input_fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) {// input_video_stream = input_fmt_ctx->streams[video_stream_idx];// video_dec_ctx = input_video_stream->codec;// ret = av_image_alloc(video_dst_data, video_dst_linesize,// video_dec_ctx->width, video_dec_ctx->height,// video_dec_ctx->pix_fmt, 1);// if (ret < 0) {// fprintf(stderr, "Could not allocate raw video buffer\n");// }// video_dst_bufsize = ret;// }////// input_frame = avcodec_alloc_frame();// if (!input_frame) {// fprintf(stderr, "Could not allocate frame\n");// ret = AVERROR(ENOMEM);// exit(-1);// }//// /* allocate the output media context */// avformat_alloc_output_context2(&oc, NULL, NULL, filename);// if (!oc) {// printf("Could not deduce output format from file extension: using MPEG.\n");// avformat_alloc_output_context2(&oc, NULL, "mpeg", filename);// }// if (!oc) {// return 1;// }// fmt = oc->oformat;//// video_st = NULL;// //audio_st = NULL;//// fmt->video_codec = AV_CODEC_ID_H264;// if (fmt->video_codec != AV_CODEC_ID_NONE) {// video_st = add_stream(oc, &video_codec, AV_CODEC_ID_H264);// }// if (video_st->codec) {// video_st->codec->width = video_dec_ctx->width;// video_st->codec->height = video_dec_ctx->height;// }// /* fmt->audio_codec = AV_CODEC_ID_MP3;// if (fmt->audio_codec != AV_CODEC_ID_NONE) {// audio_st = add_stream(oc, &audio_codec, AV_CODEC_ID_MP3);// }*///// /* Now that all the parameters are set, we can open the audio and// * video codecs and allocate the necessary encode buffers. */// if (video_st)// open_video(oc, video_codec, video_st);// /*if (audio_st)// open_audio(oc, audio_codec, audio_st);*///// av_dump_format(oc, 0, filename, 1);////// /* open the output file, if needed */// if (!(fmt->flags & AVFMT_NOFILE)) {// ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE);// if (ret < 0) {// //fprintf(stderr, "Could not open '%s': %s\n", filename,// // av_err2str(ret));// fprintf(stderr, "Could not open '%s': \n", filename);// return 1;// }// }//// /* Write the stream header, if any. */// ret = avformat_write_header(oc, NULL);// if (ret < 0) {// //fprintf(stderr, "Error occurred when opening output file: %s\n",// // av_err2str(ret));//fprintf(stderr, "Error occurred when opening output file: \n");// return 1;// }//// av_init_packet(&input_pkt);// input_pkt.data = NULL;// input_pkt.size = 0;////// if (frame)// frame->pts = 0;// for (;;) {// /* Compute current audio and video time. */// //audio_time = audio_st ? audio_st->pts.val * av_q2d(audio_st->time_base) : 0.0;// video_time = video_st ? video_st->pts.val * av_q2d(video_st->time_base) : 0.0;////if (!video_st || video_time >= STREAM_DURATION)// break;//// /* write interleaved audio and video frames */// /*if (!video_st || (video_st && audio_st && audio_time < video_time)) {// write_audio_frame(oc, audio_st);// }*///else {// av_read_frame(input_fmt_ctx, &input_pkt);//// decoded = input_pkt.size;// if (input_pkt.stream_index == video_stream_idx) {// /* decode video frame */// ret = avcodec_decode_video2(video_dec_ctx, input_frame, &got_frame, &input_pkt);// if (ret < 0) {// fprintf(stderr, "Error decoding video frame\n");// return ret;// }//// if (got_frame) {// av_image_copy((uint8_t**)&dst_picture, video_dst_linesize,// (const uint8_t **)(input_frame->data), input_frame->linesize,// video_dec_ctx->pix_fmt, video_dec_ctx->width, video_dec_ctx->height);// }// } //// write_video_frame(oc, video_st);// frame->pts += av_rescale_q(1, video_st->codec->time_base, video_st->time_base);// }// }//// av_write_trailer(oc);//// /* Close each codec. */// if (video_st)// close_video(oc, video_st);// /*if (audio_st)// close_audio(oc, audio_st);*///// if (!(fmt->flags & AVFMT_NOFILE))// avio_close(oc->pb);//// avformat_free_context(oc);// av_free(input_frame);// av_free(video_dst_data[0]);// avcodec_close(video_dec_ctx);// return 0;//}int C264ToMp4::h264FileToMp4(){ const char *filename; const char *input_file;AVFormatContext *input_fmt_ctx = NULL; AVOutputFormat *fmt; AVFormatContext *oc; AVStream *video_st; AVCodec *video_codec; double video_time; int ret; int decoded; int got_frame; /* Initialize libavcodec, and register all codecs and formats. */ av_register_all(); /*if (argc != 3) { printf("usage: %s output_file inputfile\n" "API example program to output a media file with libavformat.\n" "This program generates a synthetic audio and video stream, encodes and\n" "muxes them into a file named output_file.\n" "The output format is automatically guessed according to the file extension.\n" "Raw images can also be output by using '%%d' in the filename.\n" "\n", argv[0]); return 1; }*/ //input_file = argv[2]; // filename = argv[1];input_file = "200.264"; filename = "my200.mp4";//input_file = "E:\\sample.avi"; //filename = "E:\\sample.mp4"; if (avformat_open_input( &input_fmt_ctx, input_file, NULL, NULL) < 0) { fprintf(stderr, "Could not open source file %s\n", input_file); exit(-1); } /* retrieve stream information */ if (avformat_find_stream_info(input_fmt_ctx, NULL) < 0) { fprintf(stderr, "Could not find stream information\n"); exit(1); } if (open_codec_context(&video_stream_idx, input_fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) { input_video_stream = input_fmt_ctx->streams[video_stream_idx]; video_dec_ctx = input_video_stream->codec; ret = av_image_alloc(video_dst_data, video_dst_linesize, video_dec_ctx->width, video_dec_ctx->height, video_dec_ctx->pix_fmt, 1); if (ret < 0) { fprintf(stderr, "Could not allocate raw video buffer\n"); } video_dst_bufsize = ret; } input_frame = avcodec_alloc_frame(); if (!input_frame) { fprintf(stderr, "Could not allocate frame\n"); ret = AVERROR(ENOMEM); exit(-1); } /* allocate the output media context */ avformat_alloc_output_context2(&oc, NULL, NULL, filename); if (!oc) { printf("Could not deduce output format from file extension: using MPEG.\n"); avformat_alloc_output_context2(&oc, NULL, "mpeg", filename); } if (!oc) { return 1; } fmt = oc->oformat; video_st = NULL; //audio_st = NULL; fmt->video_codec = AV_CODEC_ID_H264; if (fmt->video_codec != AV_CODEC_ID_NONE) { video_st = add_stream(oc, &video_codec, AV_CODEC_ID_H264); } if (video_st->codec) { video_st->codec->width = video_dec_ctx->width; video_st->codec->height = video_dec_ctx->height; } /* fmt->audio_codec = AV_CODEC_ID_MP3; if (fmt->audio_codec != AV_CODEC_ID_NONE) { audio_st = add_stream(oc, &audio_codec, AV_CODEC_ID_MP3); }*/ /* Now that all the parameters are set, we can open the audio and * video codecs and allocate the necessary encode buffers. */ if (video_st) open_video(oc, video_codec, video_st); /*if (audio_st) open_audio(oc, audio_codec, audio_st);*/ av_dump_format(oc, 0, filename, 1); /* open the output file, if needed */ if (!(fmt->flags & AVFMT_NOFILE)) { ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE); if (ret < 0) { //fprintf(stderr, "Could not open '%s': %s\n", filename, // av_err2str(ret)); fprintf(stderr, "Could not open '%s': \n", filename); return 1; } } /* Write the stream header, if any. */ ret = avformat_write_header(oc, NULL); if (ret < 0) { //fprintf(stderr, "Error occurred when opening output file: %s\n", // av_err2str(ret));fprintf(stderr, "Error occurred when opening output file: \n"); return 1; } av_init_packet(&input_pkt); input_pkt.data = NULL; input_pkt.size = 0; if (frame) frame->pts = 0; for (;;) { /* Compute current audio and video time. */ //audio_time = audio_st ? audio_st->pts.val * av_q2d(audio_st->time_base) : 0.0; video_time = video_st ? video_st->pts.val * av_q2d(video_st->time_base) : 0.0;if (!video_st || video_time >= STREAM_DURATION) break; /* write interleaved audio and video frames */ /*if (!video_st || (video_st && audio_st && audio_time < video_time)) { write_audio_frame(oc, audio_st); }*/else { av_read_frame(input_fmt_ctx, &input_pkt); decoded = input_pkt.size; if (input_pkt.stream_index == video_stream_idx) { /* decode video frame */ ret = avcodec_decode_video2(video_dec_ctx, input_frame, &got_frame, &input_pkt); if (ret < 0) { fprintf(stderr, "Error decoding video frame\n"); return ret; } if (got_frame) { av_image_copy((uint8_t**)&dst_picture, video_dst_linesize, (const uint8_t **)(input_frame->data), input_frame->linesize, video_dec_ctx->pix_fmt, video_dec_ctx->width, video_dec_ctx->height); } } write_video_frame(oc, video_st); frame->pts += av_rescale_q(1, video_st->codec->time_base, video_st->time_base); } } av_write_trailer(oc); /* Close each codec. */ if (video_st) close_video(oc, video_st); /*if (audio_st) close_audio(oc, audio_st);*/ if (!(fmt->flags & AVFMT_NOFILE)) avio_close(oc->pb); avformat_free_context(oc); av_free(input_frame); av_free(video_dst_data[0]); avcodec_close(video_dec_ctx); return 0;}2. 配置过程
主要参考了以前写的一篇 mp4v2在VS2010下的编译与在项目中的使用http://blog.csdn.net/ybsun2010/article/details/16336033
（1）添加FFmpeg头文件。右击Go ->属性 -> C/C++-> 常规 -> 附件包含目录，指向下载下来的FFmpeg工程的include目录
（2）添加FFmpeg里面的lib文件。右击Go -> 属性 -> 链接器 -> 常规， 在附加库目录中加上 下载下来的FFmpeg工程的lib目录
（3） 添加FFmpeg里面的dll文件。右击Go -> 在Windows资源管理器中打开文件夹，将avcodec-55.dll，avdevice-55.dll，avfilter-3.dll，avformat-55.dll， avutil-52.dll， postproc-52.dll，swresample-0.dll和swscale-2.dll放入该目录。
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