Recherche avancée

Médias (1)

Mot : - Tags -/epub

Autres articles (111)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Soumettre bugs et patchs

    10 avril 2011

    Un logiciel n’est malheureusement jamais parfait...
    Si vous pensez avoir mis la main sur un bug, reportez le dans notre système de tickets en prenant bien soin de nous remonter certaines informations pertinentes : le type de navigateur et sa version exacte avec lequel vous avez l’anomalie ; une explication la plus précise possible du problème rencontré ; si possibles les étapes pour reproduire le problème ; un lien vers le site / la page en question ;
    Si vous pensez avoir résolu vous même le bug (...)

Sur d’autres sites (11560)

  • ffmpeg record screen and save video file to disk as .mpg

    7 janvier 2015, par musimbate

    I want to record the screen of my pc (using gdigrab on my windows machine) and store the saved video file on my disk as an mp4 or mpg file .I have found an example piece of code that grabs the screen and shows it in an SDL window here :http://xwk.iteye.com/blog/2125720 (The code is on the bottom of the page and has an english version) and the ffmpeg muxing example https://ffmpeg.org/doxygen/trunk/muxing_8c-source.html seems to be able to help encode audio and video into a desired output video file.

    I have tried to combine these two by having a format context for grabbing the screen (AVFormatContext *pFormatCtx ; in my code ) and a separate format context to write the desired video file (AVFormatContext *outFormatContextEncoded ;).Within the loop to read packets from the input stream( screen grab stream) I directly encode write packets to the output file as shown in my code.I have kept the SDL code so I can see what I am recording.Below is my code with my modified write_video_frame() function .

    The code builds OK but the output video can’t be played by vlc. When I run the command

    ffmpeg -i filename.mpg

    I get this output

    [mpeg @ 003fed20] probed stream 0 failed
    
[mpeg @ 003fed20] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
[mpeg @ 003fed20] Could not find codec parameters for stream 0 (Video: none): unknown codec
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
karamage.mpg: could not find codec parameters
    
Input #0, mpeg, from 'karamage.mpg':
    
  Duration: 19:30:09.25, start: 37545.438756, bitrate: 2 kb/s
    
    Stream #0:0[0x1e0]: Video: none, 90k tbr, 90k tbn
    
At least one output file must be specified

    Am I doing something wrong here ? I am new to ffmpeg and any guidance on this is highly appreciated.Thank you for your time.

    int main(int argc, char* argv[])
    
{
    

    
    AVFormatContext *pFormatCtx;
    

    
    int             i, videoindex;
    
    AVCodecContext  *pCodecCtx;
    
    AVCodec         *pCodec;
    

    
    av_register_all();
    
    avformat_network_init();
    

    
    //Localy defined structure.
    
    OutputStream outVideoStream = { 0 };
    

    
    const char *filename;
    
    AVOutputFormat *outFormatEncoded;
    
    AVFormatContext *outFormatContextEncoded;
    
    AVCodec *videoCodec;
    

    
    filename="karamage.mpg";
    

    
    int ret1;
    

    
    int have_video = 0, have_audio = 0;
    
    int encode_video = 0, encode_audio = 0;
    

    

    
    AVDictionary *opt = NULL;
    

    

    

    
    //ASSIGN STH TO THE FORMAT CONTEXT.
    
    pFormatCtx = avformat_alloc_context();
    

    
    //
    
    //Use this when opening a local file.
    
    //char filepath[]="src01_480x272_22.h265";
    
    //avformat_open_input(&pFormatCtx,filepath,NULL,NULL)
    

    
    //Register Device
    
    avdevice_register_all();
    

    
    //Use gdigrab
    
    AVDictionary* options = NULL;
    
    //Set some options
    
    //grabbing frame rate
    
    //av_dict_set(&options,"framerate","5",0);
    
    //The distance from the left edge of the screen or desktop
    
    //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","640x480",0);
    
    AVInputFormat *ifmt=av_find_input_format("gdigrab");
    
    if(avformat_open_input(&pFormatCtx,"desktop",ifmt,&options)!=0){
    
        printf("Couldn't open input stream.\n");
    
        return -1;
    
    }
    

    
    if(avformat_find_stream_info(pFormatCtx,NULL)<0)
    
    {
    
        printf("Couldn't find stream information.\n");
    
        return -1;
    
    }
    
    videoindex=-1;
    
    for(i=0; inb_streams; i++) 
    
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
    
        {
    
            videoindex=i;
    
            break;
    
        }
    
    if(videoindex==-1)
    
    {
    
        printf("Didn't find a video stream.\n");
    
        return -1;
    
    }
    
    pCodecCtx=pFormatCtx->streams[videoindex]->codec;
    
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
    
    if(pCodec==NULL)
    
    {
    
        printf("Codec not found.\n");
    
        return -1;
    
    }
    
    if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
    
    {
    
        printf("Could not open codec.\n");
    
        return -1;
    
    }
    

    

    
    AVFrame *pFrame,*pFrameYUV;
    
    pFrame=avcodec_alloc_frame();
    
    pFrameYUV=avcodec_alloc_frame();
    

    
    //PIX_FMT_YUV420P WHAT DOES THIS SAY ABOUT THE FORMAT??
    
    uint8_t *out_buffer=(uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
    

    

    
    avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
    

    
    //<<<<<<<<<<<-------PREP WORK TO WRITE ENCODED VIDEO FILES-----
    

    
    avformat_alloc_output_context2(&outFormatContextEncoded, NULL, NULL, filename);
    
    if (!outFormatContextEncoded) {
    
        printf("Could not deduce output format from file extension: using MPEG.\n");
    
        avformat_alloc_output_context2(&outFormatContextEncoded, NULL, "mpeg", filename);
    
    }
    
    if (!outFormatContextEncoded)
    
        return 1;
    

    
    outFormatEncoded=outFormatContextEncoded->oformat;
    

    

    
     //THIS CREATES THE STREAMS(AUDIO AND VIDEO) ADDED TO OUR OUTPUT STREAM
    

    
    if (outFormatEncoded->video_codec != AV_CODEC_ID_NONE) {
    

    
        //YOUR VIDEO AND AUDIO PROPS ARE SET HERE.
    
        add_stream(&outVideoStream, outFormatContextEncoded, &videoCodec, outFormatEncoded->video_codec);
    
        have_video = 1;
    
        encode_video = 1;
    
    }
    

    

    
     // Now that all the parameters are set, we can open the audio and
    
     // video codecs and allocate the necessary encode buffers. 
    
    if (have_video)
    
        open_video(outFormatContextEncoded, videoCodec, &outVideoStream, opt);
    

    
     av_dump_format(outFormatContextEncoded, 0, filename, 1);
    

    

    
      /* open the output file, if needed */
    
    if (!(outFormatEncoded->flags & AVFMT_NOFILE)) {
    
        ret1 = avio_open(&outFormatContextEncoded->pb, filename, AVIO_FLAG_WRITE);
    
        if (ret1 < 0) {
    
            //fprintf(stderr, "Could not open '%s': %s\n", filename,
    
            //        av_err2str(ret));
    
            fprintf(stderr, "Could not open your dumb file.\n");
    
            return 1;
    
        }
    
    }
    

    

    
    /* Write the stream header, if any. */
    
    ret1 = avformat_write_header(outFormatContextEncoded, &opt);
    
    if (ret1 < 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;
    
    }
    

    

    
    //<<<<<<<<<<<-------PREP WORK TO WRITE ENCODED VIDEO FILES-----
    

    
    //SDL----------------------------
    
    if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {  
    
        printf( "Could not initialize SDL - %s\n", SDL_GetError()); 
    
        return -1;
    
    } 
    
    int screen_w=640,screen_h=360;
    
    const SDL_VideoInfo *vi = SDL_GetVideoInfo();
    
    //Half of the Desktop's width and height.
    
    screen_w = vi->current_w/2;
    
    screen_h = vi->current_h/2;
    
    SDL_Surface *screen; 
    
    screen = SDL_SetVideoMode(screen_w, screen_h, 0,0);
    

    
    if(!screen) {  
    
        printf("SDL: could not set video mode - exiting:%s\n",SDL_GetError());  
    
        return -1;
    
    }
    
    SDL_Overlay *bmp; 
    
    bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,SDL_YV12_OVERLAY, screen); 
    
    SDL_Rect rect;
    
    //SDL End------------------------
    
    int ret, got_picture;
    

    
    AVPacket *packet=(AVPacket *)av_malloc(sizeof(AVPacket));
    

    
    //TRY TO INIT THE PACKET HERE
    
     av_init_packet(packet);
    

    

    
    //Output Information-----------------------------
    
    printf("File Information---------------------\n");
    
    av_dump_format(pFormatCtx,0,NULL,0);
    
    printf("-------------------------------------------------\n");
    

    
    struct SwsContext *img_convert_ctx;
    
    img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); 
    
    //------------------------------
    
    //
    
    while(av_read_frame(pFormatCtx, packet)>=0)
    
    {
    

    
        if(packet->stream_index==videoindex)
    
        {
    
            //HERE WE DECODE THE PACKET INTO THE FRAME
    
            ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
    
            if(ret < 0)
    
            {
    
                printf("Decode Error.\n");
    
                return -1;
    
            }
    
            if(got_picture)
    
            {
    

    
                //THIS IS WHERE WE DO STH WITH THE FRAME WE JUST GOT FROM THE STREAM
    
                //FREE AREA--START
    
                //IN HERE YOU CAN WORK WITH THE FRAME OF THE PACKET.
    
                write_video_frame(outFormatContextEncoded, &outVideoStream,packet);
    

    

    
                //FREE AREA--END
    
                sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
    

    

    
                SDL_LockYUVOverlay(bmp);
    
                bmp->pixels[0]=pFrameYUV->data[0];
    
                bmp->pixels[2]=pFrameYUV->data[1];
    
                bmp->pixels[1]=pFrameYUV->data[2];     
    
                bmp->pitches[0]=pFrameYUV->linesize[0];
    
                bmp->pitches[2]=pFrameYUV->linesize[1];   
    
                bmp->pitches[1]=pFrameYUV->linesize[2];
    
                SDL_UnlockYUVOverlay(bmp); 
    
                rect.x = 0;    
    
                rect.y = 0;    
    
                rect.w = screen_w;    
    
                rect.h = screen_h;  
    
                SDL_DisplayYUVOverlay(bmp, &rect); 
    
                //Delay 40ms----WHY THIS DELAY????
    
                SDL_Delay(40);
    
            }
    
        }
    
        av_free_packet(packet);
    
    }//THE LOOP TO PULL PACKETS FROM THE FORMAT CONTEXT ENDS HERE.
    

    
    //AFTER THE WHILE LOOP WE DO SOME CLEANING
    

    
    //av_read_pause(context);
    

    

    
     av_write_trailer(outFormatContextEncoded);
    
     close_stream(outFormatContextEncoded, &outVideoStream);
    
     if (!(outFormatContextEncoded->flags & AVFMT_NOFILE))
    
        /* Close the output file. */
    
        avio_close(outFormatContextEncoded->pb);
    

    
    /* free the stream */
    
    avformat_free_context(outFormatContextEncoded);
    

    

    

    
    //STOP DOING YOUR CLEANING
    
    sws_freeContext(img_convert_ctx);
    

    

    

    
    SDL_Quit();
    

    
    av_free(out_buffer);
    
    av_free(pFrameYUV);
    
    avcodec_close(pCodecCtx);
    
    avformat_close_input(&pFormatCtx);
    

    
    return 0;
    
}
    

    

    

    
/*
    
 * encode one video frame and send it to the muxer
    
 * return 1 when encoding is finished, 0 otherwise
    
 */
    
static int write_video_frame(AVFormatContext *oc, OutputStream *ost,AVPacket * pkt11)
    
{
    
    int ret;
    
    AVCodecContext *c;
    
    AVFrame *frame;
    
    int got_packet = 0;
    

    
    c = ost->st->codec;
    

    
    //DO NOT NEED THIS FRAME.
    
    //frame = get_video_frame(ost);
    

    
    if (oc->oformat->flags & AVFMT_RAWPICTURE) {
    

    
        //IGNORE THIS FOR A MOMENT
    
        /* a hack to avoid data copy with some raw video muxers */
    
        AVPacket pkt;
    
        av_init_packet(&pkt);
    

    
        if (!frame)
    
            return 1;
    

    
        pkt.flags        |= AV_PKT_FLAG_KEY;
    
        pkt.stream_index  = ost->st->index;
    
        pkt.data          = (uint8_t *)frame;
    
        pkt.size          = sizeof(AVPicture);
    

    
        pkt.pts = pkt.dts = frame->pts;
    
        av_packet_rescale_ts(&pkt, c->time_base, ost->st->time_base);
    

    
        ret = av_interleaved_write_frame(oc, &pkt);
    
    } else {
    

    
            ret = write_frame(oc, &c->time_base, ost->st, pkt11);
    

    
    }
    

    
    if (ret < 0) {
    
        fprintf(stderr, "Error while writing video frame: %s\n");
    
        exit(1);
    
    }
    

    

    
    return 1;
    
}

  • ffmpeg record screen and save video file to disk as .mp4 or .mpg

    5 janvier 2015, par musimbate

    I want to record the screen of my pc (using gdigrab on my windows machine) and store the saved video file on my disk as an mp4 or mpg file .I have found an example piece of code that grabs the screen and shows it in an SDL window here :http://xwk.iteye.com/blog/2125720 (The code is on the bottom of the page and has an english version) and the ffmpeg muxing example https://ffmpeg.org/doxygen/trunk/muxing_8c-source.html seems to be able to help encode audio and video into a desired output video file.

    I have tried to combine these two by having a format context for grabbing the screen (AVFormatContext *pFormatCtx ; in my code ) and a separate format context to write the desired video file (AVFormatContext *outFormatContextEncoded ;).Within the loop to read packets from the input stream( screen grab stream) I directly encode write packets to the output file as shown in my code.I have kept the SDL code so I can see what I am recording.Below is my code with my modified write_video_frame() function .

    The code builds OK but the output video can’t be played by vlc. When I run the command

    ffmpeg -i filename.mpg

    I get this output

    [mpeg @ 003fed20] probed stream 0 failed
    
[mpeg @ 003fed20] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
[mpeg @ 003fed20] Could not find codec parameters for stream 0 (Video: none): unknown codec
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
karamage.mpg: could not find codec parameters
    
Input #0, mpeg, from 'karamage.mpg':
    
  Duration: 19:30:09.25, start: 37545.438756, bitrate: 2 kb/s
    
    Stream #0:0[0x1e0]: Video: none, 90k tbr, 90k tbn
    
At least one output file must be specified

    Am I doing something wrong here ? I am new to ffmpeg and any guidance on this is highly appreciated.Thank you for your time.

    int main(int argc, char* argv[])
    
{
    

    
    AVFormatContext *pFormatCtx;
    

    
    int             i, videoindex;
    
    AVCodecContext  *pCodecCtx;
    
    AVCodec         *pCodec;
    

    
    av_register_all();
    
    avformat_network_init();
    

    
    //Localy defined structure.
    
    OutputStream outVideoStream = { 0 };
    

    
    const char *filename;
    
    AVOutputFormat *outFormatEncoded;
    
    AVFormatContext *outFormatContextEncoded;
    
    AVCodec *videoCodec;
    

    
    filename="karamage.mpg";
    

    
    int ret1;
    

    
    int have_video = 0, have_audio = 0;
    
    int encode_video = 0, encode_audio = 0;
    

    

    
    AVDictionary *opt = NULL;
    

    

    

    
    //ASSIGN STH TO THE FORMAT CONTEXT.
    
    pFormatCtx = avformat_alloc_context();
    

    
    //
    
    //Use this when opening a local file.
    
    //char filepath[]="src01_480x272_22.h265";
    
    //avformat_open_input(&pFormatCtx,filepath,NULL,NULL)
    

    
    //Register Device
    
    avdevice_register_all();
    

    
    //Use gdigrab
    
    AVDictionary* options = NULL;
    
    //Set some options
    
    //grabbing frame rate
    
    //av_dict_set(&options,"framerate","5",0);
    
    //The distance from the left edge of the screen or desktop
    
    //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","640x480",0);
    
    AVInputFormat *ifmt=av_find_input_format("gdigrab");
    
    if(avformat_open_input(&pFormatCtx,"desktop",ifmt,&options)!=0){
    
        printf("Couldn't open input stream.\n");
    
        return -1;
    
    }
    

    
    if(avformat_find_stream_info(pFormatCtx,NULL)<0)
    
    {
    
        printf("Couldn't find stream information.\n");
    
        return -1;
    
    }
    
    videoindex=-1;
    
    for(i=0; inb_streams; i++) 
    
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
    
        {
    
            videoindex=i;
    
            break;
    
        }
    
    if(videoindex==-1)
    
    {
    
        printf("Didn't find a video stream.\n");
    
        return -1;
    
    }
    
    pCodecCtx=pFormatCtx->streams[videoindex]->codec;
    
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
    
    if(pCodec==NULL)
    
    {
    
        printf("Codec not found.\n");
    
        return -1;
    
    }
    
    if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
    
    {
    
        printf("Could not open codec.\n");
    
        return -1;
    
    }
    

    

    
    AVFrame *pFrame,*pFrameYUV;
    
    pFrame=avcodec_alloc_frame();
    
    pFrameYUV=avcodec_alloc_frame();
    

    
    //PIX_FMT_YUV420P WHAT DOES THIS SAY ABOUT THE FORMAT??
    
    uint8_t *out_buffer=(uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
    

    

    
    avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
    

    
    //<<<<<<<<<<<-------PREP WORK TO WRITE ENCODED VIDEO FILES-----
    

    
    avformat_alloc_output_context2(&outFormatContextEncoded, NULL, NULL, filename);
    
    if (!outFormatContextEncoded) {
    
        printf("Could not deduce output format from file extension: using MPEG.\n");
    
        avformat_alloc_output_context2(&outFormatContextEncoded, NULL, "mpeg", filename);
    
    }
    
    if (!outFormatContextEncoded)
    
        return 1;
    

    
    outFormatEncoded=outFormatContextEncoded->oformat;
    

    

    
     //THIS CREATES THE STREAMS(AUDIO AND VIDEO) ADDED TO OUR OUTPUT STREAM
    

    
    if (outFormatEncoded->video_codec != AV_CODEC_ID_NONE) {
    

    
        //YOUR VIDEO AND AUDIO PROPS ARE SET HERE.
    
        add_stream(&outVideoStream, outFormatContextEncoded, &videoCodec, outFormatEncoded->video_codec);
    
        have_video = 1;
    
        encode_video = 1;
    
    }
    

    

    
     // Now that all the parameters are set, we can open the audio and
    
     // video codecs and allocate the necessary encode buffers. 
    
    if (have_video)
    
        open_video(outFormatContextEncoded, videoCodec, &outVideoStream, opt);
    

    
     av_dump_format(outFormatContextEncoded, 0, filename, 1);
    

    

    
      /* open the output file, if needed */
    
    if (!(outFormatEncoded->flags & AVFMT_NOFILE)) {
    
        ret1 = avio_open(&outFormatContextEncoded->pb, filename, AVIO_FLAG_WRITE);
    
        if (ret1 < 0) {
    
            //fprintf(stderr, "Could not open '%s': %s\n", filename,
    
            //        av_err2str(ret));
    
            fprintf(stderr, "Could not open your dumb file.\n");
    
            return 1;
    
        }
    
    }
    

    

    
    /* Write the stream header, if any. */
    
    ret1 = avformat_write_header(outFormatContextEncoded, &opt);
    
    if (ret1 < 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;
    
    }
    

    

    
    //<<<<<<<<<<<-------PREP WORK TO WRITE ENCODED VIDEO FILES-----
    

    
    //SDL----------------------------
    
    if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {  
    
        printf( "Could not initialize SDL - %s\n", SDL_GetError()); 
    
        return -1;
    
    } 
    
    int screen_w=640,screen_h=360;
    
    const SDL_VideoInfo *vi = SDL_GetVideoInfo();
    
    //Half of the Desktop's width and height.
    
    screen_w = vi->current_w/2;
    
    screen_h = vi->current_h/2;
    
    SDL_Surface *screen; 
    
    screen = SDL_SetVideoMode(screen_w, screen_h, 0,0);
    

    
    if(!screen) {  
    
        printf("SDL: could not set video mode - exiting:%s\n",SDL_GetError());  
    
        return -1;
    
    }
    
    SDL_Overlay *bmp; 
    
    bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,SDL_YV12_OVERLAY, screen); 
    
    SDL_Rect rect;
    
    //SDL End------------------------
    
    int ret, got_picture;
    

    
    AVPacket *packet=(AVPacket *)av_malloc(sizeof(AVPacket));
    

    
    //TRY TO INIT THE PACKET HERE
    
     av_init_packet(packet);
    

    

    
    //Output Information-----------------------------
    
    printf("File Information---------------------\n");
    
    av_dump_format(pFormatCtx,0,NULL,0);
    
    printf("-------------------------------------------------\n");
    

    
    struct SwsContext *img_convert_ctx;
    
    img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); 
    
    //------------------------------
    
    //
    
    while(av_read_frame(pFormatCtx, packet)>=0)
    
    {
    

    
        if(packet->stream_index==videoindex)
    
        {
    
            //HERE WE DECODE THE PACKET INTO THE FRAME
    
            ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
    
            if(ret < 0)
    
            {
    
                printf("Decode Error.\n");
    
                return -1;
    
            }
    
            if(got_picture)
    
            {
    

    
                //THIS IS WHERE WE DO STH WITH THE FRAME WE JUST GOT FROM THE STREAM
    
                //FREE AREA--START
    
                //IN HERE YOU CAN WORK WITH THE FRAME OF THE PACKET.
    
                write_video_frame(outFormatContextEncoded, &outVideoStream,packet);
    

    

    
                //FREE AREA--END
    
                sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
    

    

    
                SDL_LockYUVOverlay(bmp);
    
                bmp->pixels[0]=pFrameYUV->data[0];
    
                bmp->pixels[2]=pFrameYUV->data[1];
    
                bmp->pixels[1]=pFrameYUV->data[2];     
    
                bmp->pitches[0]=pFrameYUV->linesize[0];
    
                bmp->pitches[2]=pFrameYUV->linesize[1];   
    
                bmp->pitches[1]=pFrameYUV->linesize[2];
    
                SDL_UnlockYUVOverlay(bmp); 
    
                rect.x = 0;    
    
                rect.y = 0;    
    
                rect.w = screen_w;    
    
                rect.h = screen_h;  
    
                SDL_DisplayYUVOverlay(bmp, &rect); 
    
                //Delay 40ms----WHY THIS DELAY????
    
                SDL_Delay(40);
    
            }
    
        }
    
        av_free_packet(packet);
    
    }//THE LOOP TO PULL PACKETS FROM THE FORMAT CONTEXT ENDS HERE.
    

    
    //AFTER THE WHILE LOOP WE DO SOME CLEANING
    

    
    //av_read_pause(context);
    

    

    
     av_write_trailer(outFormatContextEncoded);
    
     close_stream(outFormatContextEncoded, &outVideoStream);
    
     if (!(outFormatContextEncoded->flags & AVFMT_NOFILE))
    
        /* Close the output file. */
    
        avio_close(outFormatContextEncoded->pb);
    

    
    /* free the stream */
    
    avformat_free_context(outFormatContextEncoded);
    

    

    

    
    //STOP DOING YOUR CLEANING
    
    sws_freeContext(img_convert_ctx);
    

    

    

    
    SDL_Quit();
    

    
    av_free(out_buffer);
    
    av_free(pFrameYUV);
    
    avcodec_close(pCodecCtx);
    
    avformat_close_input(&pFormatCtx);
    

    
    return 0;
    
}
    

    

    

    
/*
    
 * encode one video frame and send it to the muxer
    
 * return 1 when encoding is finished, 0 otherwise
    
 */
    
static int write_video_frame(AVFormatContext *oc, OutputStream *ost,AVPacket * pkt11)
    
{
    
    int ret;
    
    AVCodecContext *c;
    
    AVFrame *frame;
    
    int got_packet = 0;
    

    
    c = ost->st->codec;
    

    
    //DO NOT NEED THIS FRAME.
    
    //frame = get_video_frame(ost);
    

    
    if (oc->oformat->flags & AVFMT_RAWPICTURE) {
    

    
        //IGNORE THIS FOR A MOMENT
    
        /* a hack to avoid data copy with some raw video muxers */
    
        AVPacket pkt;
    
        av_init_packet(&pkt);
    

    
        if (!frame)
    
            return 1;
    

    
        pkt.flags        |= AV_PKT_FLAG_KEY;
    
        pkt.stream_index  = ost->st->index;
    
        pkt.data          = (uint8_t *)frame;
    
        pkt.size          = sizeof(AVPicture);
    

    
        pkt.pts = pkt.dts = frame->pts;
    
        av_packet_rescale_ts(&pkt, c->time_base, ost->st->time_base);
    

    
        ret = av_interleaved_write_frame(oc, &pkt);
    
    } else {
    

    
            ret = write_frame(oc, &c->time_base, ost->st, pkt11);
    

    
    }
    

    
    if (ret < 0) {
    
        fprintf(stderr, "Error while writing video frame: %s\n");
    
        exit(1);
    
    }
    

    

    
    return 1;
    
}

  • How to save HLS stream to local disk in source code by ffmpeg ?

    24 octobre 2016, par Zachary

    The HSL stream is divided into multiple ts files, now I want to save these files and the m3u8 file to local disk in source code by calling ffmpeg APIs.

    Does ffmpeg support this function ?

    If so how to implement the function ?

    Otherwise can anyone give me some suggestions about how to achieve this goal ?

    Many thanks.

Navigation