Recherche avancée

Sur d’autres sites (5553)

• rtmp Videos encoded with FFmpeg play too fast

  30 janvier 2016, par 江嘉荣

  play back too fast and loading Every once in a while

  here is the code ... please help...

  pFormatCtx = avformat_alloc_context();
  
  
  
  out_filename = "rtmp://192.168.1.105:1935/jc";
  
  
  
   avformat_alloc_output_context2(&pFormatCtx, ofmt, "flv", out_filename);    
  
  
  
   ofmt = pFormatCtx->oformat;
  
  
  
  if (avio_open(&pFormatCtx->pb,out_filename, AVIO_FLAG_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 = 30;
  
  
  
  
  
  br = 400 * 1000;
  
  pCodecCtx = video_st->codec;
  
  pCodecCtx->codec_id = AV_CODEC_ID_H264;
  
  pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
  pCodecCtx->pix_fmt = PIX_FMT_YUV420P;
  
  
  
  pCodecCtx->gop_size = 12;
  
   pCodecCtx->max_qdiff = 4;
  
  
  
  pCodecCtx->qmin = 0;
  
  pCodecCtx->qmax = 51;
  
  
  
  pCodecCtx->bit_rate = br;
  
  pCodecCtx->rc_min_rate =br;
  
  pCodecCtx->rc_max_rate = br;
  
  pCodecCtx->bit_rate_tolerance = br;
  
  pCodecCtx->rc_buffer_size=br;
  
  
  
  pCodecCtx->rc_initial_buffer_occupancy = pCodecCtx->rc_buffer_size*3/4;
  
  
  
  pCodecCtx->time_base.num = 1;
  
  pCodecCtx->time_base.den = 30;
  
  
  
  start_time = 0;
  
  
  
  pCodecCtx->max_b_frames = 3;
  
  
  
  AVDictionary *param = 0;
  
  
  
  if(pCodecCtx->codec_id == AV_CODEC_ID_H264) {
  
  
  
      av_dict_set(&param, "preset", "ultrafast", 0);
  
      av_dict_set(&param, "tune", "zerolatency", 0);
  
      av_dict_set(&param, "max_delay", "500", 0);
  
  }
  
  
  
  av_dump_format(pFormatCtx, 0, out_filename, AVIO_FLAG_WRITE);
  
  
  
  pCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  
  
  avformat_write_header(pFormatCtx, NULL);
  
  
  
  y_size = pCodecCtx->width * pCodecCtx->height;
  
  
  
  return 0;

  get pFrame

      pFrame->width = encoder_h264_frame_width;
  
      pFrame->height = encoder_h264_frame_height;
  
      pFrame->format = PIX_FMT_YUV420P;

  I don’t know if it’s right way to set the pFrame->pts here...

      pFrame->pts = av_rescale_q(framecnt, pCodecCtx->time_base, video_st-    >codec->time_base);
  
      avpicture_fill((AVPicture *)pFrame, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width,    pCodecCtx->height);
  
      pkt.data = NULL; 
  
      pkt.size = 0;
  
  
  
      int got_picture = 0;
  
  
  
      int ret = avcodec_encode_video2(pCodecCtx, &pkt, pFrame, &got_picture);
  
      framecnt++;
  
      if(ret < 0) {
  
      }
  
      if (got_picture=) {
  
          pkt.stream_index = video_st->index;

  is it right ?

          pkt.pts = av_rescale_q(pkt.pts, video_st->codec->time_base, video_st->time_base);
  
          pkt.dts = av_rescale_q(pkt.dts, video_st->codec->time_base, video_st->time_base); 
  
  
  
          ret = av_interleaved_write_frame(pFormatCtx, &pkt);
  
  
  
      }
  
      av_frame_free(&pFrame);
  
      av_free_packet(&pkt);
  
      free(yuv420_data);

  This problem has troubled me for a lot of days....

• Can't link FFmpeg in Visual Studio 2013

  22 février 2016, par Sir DrinksCoffeeALot

  I’m struggling with this for past 3-4 days with barely any progress. I’ve downloaded "dev" and "shared" archives and extracted them. "Dev" archive has .lib and .h files and "Shared" has .dll files needed for running app. These are the steps that i’ve done linking-wise :

  Project -> Properties -> Configuration Properties -> VC++ Directories -> Include Directories -> ...\ dev\ include

  Project -> Properties -> Configuration Properties -> VC++ Directories -> Library Directories -> ...\ dev\ lib

  Project -> Properties -> Configuration Properties -> C/C++ -> General -> Additional Include Directories -> ...\ dev\ include

  Project -> Properties -> Configuration Properties -> Linker -> General -> Additional Library Directories -> ...\ dev\ lib

  Project -> Properties -> Configuration Properties -> Linker -> Input -> Additional Dependencies -> avcodec.lib ... swscale.lib

  And when i try to build it i get following error :

  Error 1 error LNK2019: unresolved external symbol _avcodec_register_all referenced in function _main...

  I have no idea why,somehow .lib are not getting linked or something or i’ve done something wrong. It’s getting really frustrating and ffmpeg is crucial in project that i’m working on, basicly i can’t do anything without it. So please if someone could point me in right direction i would aprreciate it very much.

  This is the example that im trying to build.

  #include 
  
  extern "C"
  
  {
  
  
  
  #include "libavcodec\avcodec.h"
  
  }
  
  
  
  
  
  #pragma comment(lib, "avcodec.lib")
  
  
  
  int main()
  
  {
  
      printf("Trying avcodec_register_all... ");
  
      avcodec_register_all();
  
      printf("Done.\n");
  
      return 0;
  
  }

  Thank you in advance.

• FFMpeg mux mp4 format result in streams not in file

  5 mars 2016, par M.Taha

  I am new to ffmpeg, i have spend more than 10 days on finding any way to do muxing in mp4 format with audio and vedio in streams buffer not in file.
  What i want is to mux mp4 format audio & vedio in a streams.

  I am able to do muxing mp4 format in file. But not able to get mux mp4 format in streams buffer.

  Till now i have tried this :
  avio_alloc_context(avio_ctx_buffer, avio_ctx_buffer_size, 1, &bd, NULL, &write_packet, NULL) ;
  By calling this avio_alloc_context and passing reference of write_packet function. I am able to get call write_packet. But when i write the data coming in write_packet in a file, and making mp4 file with that. The resultant mp4 file is not working. There is no vedio or audio information available by watching this file in Media Info.
  The header is written , then loop is written and finally trailer is written, but not getting success in running final file.

  Is there any good way to do mux in mp4 format in streams, so please tell me.

  Kindly help to me to do this.

  Thanks in advance.