Recherche avancée

Sur d’autres sites (5294)

• How to create video from collection of jpg in using ffmpeg library

  4 novembre 2016, par user3214224

  I’m new for ffmpeg. I try to create avi video from one single jpg image using ffmpeg libraries. but, created video image not proper. I have attached two images one is actual image "img.jpg" another one is code gave output video image.

  In command line it’s working perfectly :

  ffmpeg -i img.jpg img.avi 

  Thanks

  

  

  int flush_encoder(AVFormatContext *fmt_ctx,unsigned int stream_index)
  

  int ret;
  
  int got_frame;
  
  AVPacket enc_pkt;
  
  
  
  if (!(fmt_ctx->streams[stream_index]->codec->codec->capabilities &
  
      CODEC_CAP_DELAY))
  
      return 0;
  
  while (1) {
  
      enc_pkt.data = NULL;
  
      enc_pkt.size = 0;
  
      av_init_packet(&enc_pkt);
  
      ret = avcodec_encode_video2 (fmt_ctx->streams[stream_index]->codec, &enc_pkt,
  
          NULL, &got_frame);
  
      av_frame_free(NULL);
  
  
  
      if (ret < 0)
  
          break;
  
      if (!got_frame){
  
          ret=0;
  
          break;
  
      }
  
  
  
      printf("Flush Encoder: Succeed to encode 1 frame!\tsize:%5d\n",enc_pkt.size);
  
      /* mux encoded frame */
  
      ret = av_write_frame(fmt_ctx, &enc_pkt);
  
      if (ret < 0)
  
          break;
  
  }
  
  return ret;

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

  Gtk::Main kit(argc, argv);
  
  AVFormatContext* pFormatCtx;
  
  AVOutputFormat* fmt;
  
  AVStream* video_st;
  
  
  
  AVCodecContext* pCodecCtx;
  
  AVCodec* pCodec;
  
  AVPacket pkt;
  
  uint8_t* picture_buf;
  
  AVFrame* pFrame;
  
  int picture_size;
  
  int y_size;
  
  int framecnt=0;
  
  FILE *in_file = fopen("img.jpg", "rb");   //Input raw YUV data
  
  int in_w=1024,in_h=768;                   //Input data's width and height
  
  int framenum=100;
  
  const char* out_file = "out.avi";
  
  
  
  av_register_all();
  
  //Method1.
  
  pFormatCtx = avformat_alloc_context();
  
  //Guess Format
  
  fmt = av_guess_format(NULL, out_file, NULL);
  
  pFormatCtx->oformat = fmt;
  
  
  
  //Open output URL
  
  if (avio_open(&pFormatCtx->pb,out_file, AVIO_FLAG_READ_WRITE) < 0){
  
      printf("Failed to open output file! \n");
  
      return -1;
  
  }
  
  
  
  video_st = avformat_new_stream(pFormatCtx, 0);
  
  video_st->time_base.num = 1;
  
  video_st->time_base.den = 25;
  
  
  
  if (video_st==NULL){
  
      return -1;
  
  }
  
  //Param that must set
  
  pCodecCtx = video_st->codec;
  
  pCodecCtx->codec_id = fmt->video_codec;
  
  pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
  pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  pCodecCtx->width = in_w;
  
  pCodecCtx->height = in_h;
  
  pCodecCtx->time_base.num = 1;
  
  pCodecCtx->time_base.den = 25;
  
  pCodecCtx->bit_rate = 400000;
  
  pCodecCtx->gop_size=250;
  
  pCodecCtx->qmin = 2;
  
  pCodecCtx->qmax = 31;
  
  
  
  //Optional Param
  
  pCodecCtx->max_b_frames=3;
  
  
  
  // Set Option
  
  AVDictionary *param = 0;
  
  //H.264
  
  if(pCodecCtx->codec_id == AV_CODEC_ID_H264) {
  
      av_dict_set(&param, "preset", "slow", 0);
  
      av_dict_set(&param, "tune", "zerolatency", 0);
  
  }
  
  //H.265
  
  if(pCodecCtx->codec_id == AV_CODEC_ID_H265){
  
      av_dict_set(&param, "preset", "ultrafast", 0);
  
      av_dict_set(&param, "tune", "zero-latency", 0);
  
  }
  
  
  
  //Show some Information
  
  av_dump_format(pFormatCtx, 0, out_file, 1);
  
  
  
  pCodec = avcodec_find_encoder(pCodecCtx->codec_id);
  
  if (!pCodec){
  
      printf("Can not find encoder! \n");
  
      return -1;
  
  }
  
  if (avcodec_open2(pCodecCtx, pCodec,&param) < 0){
  
      printf("Failed to open encoder! \n");
  
      return -1;
  
  }
  
  
  
  
  
  pFrame = av_frame_alloc();
  
  picture_size = avpicture_get_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
  
  picture_buf = (uint8_t *)av_malloc(picture_size);
  
  avpicture_fill((AVPicture *)pFrame, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
  
  
  
  //Write File Header
  
  avformat_write_header(pFormatCtx,NULL);
  
  
  
  av_new_packet(&pkt,picture_size);
  
  
  
  y_size = pCodecCtx->width * pCodecCtx->height;
  
  
  
  for (int i=0; i/Read raw YUV data
  
      if (fread(picture_buf, 1, y_size*3/2, in_file) <= 0){
  
          printf("Failed to read raw data! \n");
  
          return -1;
  
      }else if(feof(in_file)){
  
          break;
  
      }
  
      pFrame->data[0] = picture_buf;              // Y
  
      pFrame->data[1] = picture_buf+ y_size;      // U
  
      pFrame->data[2] = picture_buf+ y_size*5/4;  // V
  
      //PTS
  
      pFrame->pts=i;
  
      int got_picture=0;
  
      //Encode
  
      int ret = avcodec_encode_video2(pCodecCtx, &pkt,pFrame, &got_picture);
  
      if(ret < 0){
  
          printf("Failed to encode! \n");
  
          return -1;
  
      }
  
      if (got_picture==1){
  
          printf("Succeed to encode frame: %5d\tsize:%5d\n",framecnt,pkt.size);
  
          framecnt++;
  
          pkt.stream_index = video_st->index;
  
          ret = av_write_frame(pFormatCtx, &pkt);
  
          av_free_packet(&pkt);
  
      }
  
  }
  
  //Flush Encoder
  
  int ret = flush_encoder(pFormatCtx,0);
  
  if (ret < 0) {
  
      printf("Flushing encoder failed\n");
  
      return -1;
  
  }
  
  
  
  //Write file trailer
  
  av_write_trailer(pFormatCtx);
  
  
  
  //Clean
  
  if (video_st){
  
      avcodec_close(video_st->codec);
  
      av_free(pFrame);
  
      av_free(picture_buf);
  
  }
  
  avio_close(pFormatCtx->pb);
  
  avformat_free_context(pFormatCtx);
  
  
  
  fclose(in_file);
  
  
  
  return 0;

• Videojs does not play converted mp4 file

  4 février 2017, par Chris Palmer Breuer

  I am creating a platform for video files to be uploaded to. In order for them to get played through Videojs, I convert/demux mkv/flv/3gp files to mp4 files.

  The issue I encounter is that if I demux such video/mkv file, I get the error message Video format or mime type not supported, even though it is a "working" mp4 file on my computer.

  I think I understand that mkv files are containers, and that if demuxed it keeps the same video and audio codec and if that is not supported by Videojs/HTML5 the video cannot get played. Please, correct me if I am wrong.

  Can anyone please tell me why this demux of mkv.mkv to mkv.mp4 will not play in my browser ?

  ➜  ~ ffmpeg -i mkv.mkv -vcodec copy -acodec copy mkv.mp4
  
  ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, matroska,webm, from 'mkv.mkv':
  
    Metadata:
  
      ENCODER         : Lavf53.24.2
  
    Duration: 00:00:34.08, start: -1.400000, bitrate: 1232 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 25 fps, 25 tbr, 1k tbn, 25 tbc (default)
  
      Stream #0:1: Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
  
  Output #0, mp4, to 'mkv.mp4':
  
    Metadata:
  
      encoder         : Lavf57.56.100
  
      Stream #0:0: Video: mpeg4 (Simple Profile) ( [0][0][0] / 0x0020), yuv420p, 720x480 [SAR 1:1 DAR 3:2], q=2-31, 25 fps, 25 tbr, 16k tbn, 1k tbc (default)
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, 5.1 (default)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  887 fps=0.0 q=-1.0 Lsize=    5130kB time=00:00:35.45 bitrate=1185.4kbits/s speed= 668x
  
  video:3447kB audio:1663kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.401607%

  Thanks for all the help already. I cant seem to find an answer...

• ffmpeg livestream only shows one frame at a time

  28 octobre 2016, par user3308335

  So, I’ve tried to turn one of my pis into a silly "baby cam" for my pet and I followed the tutorial made by Ustream.tv on how to do this.

  This is the script I run to start the stream :

  #!/bin/bash
  
  RTMP_URL=<rtmpurl>
  
  STREAM_KEY=<streamkey>
  
  while :
  
  do
  
    raspivid -n -hf -t 0 -w 640 -h 480 -fps 15 -b 400000 -o - | ffmpeg -i - -vcodec copy -an  -f flv $RTMP_URL/$STREAM_KEY
  
    sleep 2
  
  done
  
  </streamkey></rtmpurl>

  However, whenever I go to view the stream, the stream shows only one frame. The same frame until I refresh the browser, watch the ad again, and then it’s a new same frame that it’ll show.

  Does anyone have an idea why this might be happening or any troubleshooting tricks for me to try ?