可編譯運作：調用ffmpeg接口，将RTSP流儲存為MP4的C代碼

當然，也是從網上下載下傳的。經過一番修改編譯，運作結果正确。

　　由于dts/pts，有的播放器播放速度有所差異。

　　這裡就直接就共享出來（也可以去下載下傳區下載下傳）。

• 頭檔案

#ifndef __GH_RTSP_2_MP4_H__
#define __GH_RTSP_2_MP4_H__
 
 
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <libavcodec/avcodec.h>
#include <libavdevice/avdevice.h>
#include <libavformat/avformat.h>
#include <libavfilter/avfilter.h>
#include <libavutil/avutil.h>
#include <libswscale/swscale.h>
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
 
#ifdef __cplusplus
}
#endif
 
#endif      

• Ｃ源碼

#include <string.h>
#include <pthread.h>
#include <unistd.h>
 
 
#include "gh_rtsp2mp4.h"
 
 
#define RTSP "rtsp://admin:[email protected]"
 
//經過實驗，這個值最好
#define PTS_VALUE 4500
#define MAX_FRAMES 300
 
static bool g_RunningFlag = true;
 
static int rtsp2mp4(const char* pInputFileName, const char* pOutputFileName)
{
    AVOutputFormat *ofmt = NULL;
    //Input AVFormatContext and Output AVFormatContext
    AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
    AVPacket pkt;
 
    int ret=0, i=0;
    int video_index = -1;
    int frame_index = 0;
    int dts = 0;
    int pts = 0;
 
    av_register_all();
    //Network
    avformat_network_init();
    //Input
    if ((ret = avformat_open_input(&ifmt_ctx, pInputFileName, 0, 0)) < 0)
    {
        printf("Could not open input file.");
        goto end;
    }
 
    if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0)
    {
        printf("Failed to retrieve input stream information");
        goto end;
    }
 
    for (i = 0; i<ifmt_ctx->nb_streams; i++)
    {
        if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
        {
            video_index = i;
            break;
        }
    }
 
    av_dump_format(ifmt_ctx, 0, pInputFileName, 0);
 
    //Output
    avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, pOutputFileName); //RTMP
    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->nb_streams; i++)
    {
        //Create output AVStream according to input AVStream
        AVStream *in_stream  = ifmt_ctx->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
        ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
        if (ret < 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 |= AV_CODEC_FLAG_GLOBAL_HEADER;
        }
    }
 
    //Dump Format------------------
    av_dump_format(ofmt_ctx, 0, pOutputFileName, 1);
    //Open output URL
    if (!(ofmt->flags & AVFMT_NOFILE))
    {
        ret = avio_open(&ofmt_ctx->pb, pOutputFileName, AVIO_FLAG_WRITE);
        if (ret < 0)
        {
            printf("Could not open output URL '%s'", pOutputFileName);
            goto end;
        }
    }
 
    //Write file header
    ret = avformat_write_header(ofmt_ctx, NULL);
    if (ret < 0)
    {
        printf("Error occurred when opening output URL\n");
        goto end;
    }
 
    #if USE_H264BSF
        AVBitStreamFilterContext* h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
    #endif
 
    while (g_RunningFlag)
    {
        AVStream *in_stream, *out_stream;
        //Get an AVPacket
        ret = av_read_frame(ifmt_ctx, &pkt);
        if (ret < 0)
        {
            break;
        }
 
        in_stream  = ifmt_ctx->streams[pkt.stream_index];
        out_stream = ofmt_ctx->streams[pkt.stream_index];
 
        //Convert PTS/DTS
#if 1
        if (pts == 0)
        {
            pts = pkt.pts;
            dts = pkt.dts;
        }
        else
        {
            pkt.pts += pts;
            pkt.dts += dts;
        }
        if (pkt.dts < pkt.pts)
        {
            pkt.dts = pkt.pts;
        }
#else
        pkt.pts += 4500*frame_index;
        pkt.dts += 4500*frame_index;
#endif
        pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
        pkt.pos = -1;
 
        if (pkt.stream_index == video_index)
        {
            //printf("Receive %8d video frames from RTSP\n", frame_index);
            frame_index++;
    #if USE_H264BSF
                av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
    #endif
        }
 
        ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
        if (ret < 0 && frame_index > 3)
        {
            printf("Error muxing packet\n");
            break;
        }
 
        av_free_packet(&pkt);
 
        if (frame_index > MAX_FRAMES)
        {
            break;
        }
    }
 
    #if USE_H264BSF
        av_bitstream_filter_close(h264bsfc);
    #endif
 
    //Write file trailer
    av_write_trailer(ofmt_ctx);
 
end:
    avformat_close_input(&ifmt_ctx);
    /* close output */
    if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
    {
        avio_close(ofmt_ctx->pb);
    }
    avformat_free_context(ofmt_ctx);
 
    if (ret < 0 && ret != AVERROR_EOF)
    {
        printf("Error occurred.\n");
        return -1;
    }
    return 0;
}
 
int main(int argc, char **argv)
{
    rtsp2mp4(RTSP, "rtsp.mp4");
    return 0;
}      

• Makefile

APP:= gh_rtsp2mp4
 
SRCS:= gh_rtsp2mp4.cpp
 
INCS:= $(wildcard *.h)
 
OBJS:= $(SRCS:.cpp=.o)
 
#GST
CPPFLAGS+=  -DGST_FLAG \
    -I/usr/local/include
 
LIBS := -L /usr/lib/x86_64-linux-gnu -lavcodec -lavutil -lswresample -lavformat \
  -L /usr/linclude -lz -llzma -lbz2
 
# -L /usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_imgproc -lopencv_highgui \
 
 
LIBS += $(GLLINK)
# LIBS += -lGL -lGLU -lglut
 
 
#LIBS+= `pkg-config --libs $(PKGS)`
 
all: $(APP)
 
.o: .cpp $(INCS) Makefile
    g++ -g -c $@ $(CPPFLAGS) $<
 
$(APP): $(OBJS) Makefile
    g++ -g -o $(APP) $(OBJS) $(LIBS)
 
 
clean:
    rm -rf $(OBJS) $(APP)