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    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

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    Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
    Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...)

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    Puis-je poster des contenus à partir d’une tablette Ipad ?
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Sur d’autres sites (8494)

  • How to save file to s3 after processing by ffmpeg using carrierwave

    25 septembre 2013, par loganathan

    I am trying to convert the bit rate of the Mp3 file before uploading to S3, I can able to create version for the mp3 file but the version is not saving in s3 instead original file is uploading to s3.

      version :bitrate_96k do
    
    process :resample => "96"
    
  end
    

    
def resample(bitrate)
    
    tmp_path   = File.join( File.basename(current_path), "tmpfile" )
    
    File.rename current_path, tmp_path
    
    audio_details  = `ffmpeg -i '#{tmp_path}' 2>&1`.split(",").split("\n").flatten
    
    file_bitrate =  audio_details.grep(/bitrate/).grep(/bitrate/).join.split("bitrate: ").last.split("\s").first
    
    unless file_bitrate == bitrate
    
      `ffmpeg -i #{tmp_path.shellescape}  -acodec libmp3lame -y -ab 96k #{current_path.path}`
    
      File.unlink(current_path)
    
     FileUtils.mv(temp_path, current_path)
    
    end
    
  end

  • 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;
    
}

  • 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;
    
}

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