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• 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....

• FFmpeg First 2 Seconds of Video Not Showing

  18 janvier 2016, par Pamela

  This code works fine for some audio files (makes a slideshow of JPG pictures with a PNG watermark and MP3 audio, while maintaining aspect ratio) but for this audio file, the pictures are not showing for the first two seconds or so of the video :

  ffmpeg -y -framerate 1/12 -i "media/%03d.jpg" -i "media/audio.mp3" -loop 1 -i "media/watermark.png" -filter_complex "[0:v]scale=iw*min(3840/iw\,2160/ih):ih*min(3840/iw\,2160/ih), pad=3840:2160:(3840-iw)/2:(2160-ih)/2[ss]; [ss][2:v] overlay=main_w-overlay_w-10:main_h-overlay_h-10:shortest=1[out]" -map "[out]" -map 1:a -c:v libx264 -r 24 -preset veryfast -tune stillimage -pix_fmt yuv420p -c:a copy -map_metadata -1 "media/video.mkv" -report

  I tried converting the audio into different formats of MP3, tried changing bitrates, changed audio to stereo, and even tried converting it to a WAV. None of these things worked.

  Here are the report results for when I run this command.

  If it makes a difference, I’m using Ubuntu 14.04 and FFmpeg version N-77455-g4707497 (latest version).

• ffmpeg feeding mp4 file to rtsp stream

  20 mai 2019, par damini chopra

  I am trying to feed a mp4 file from ffmpeg to rtsp stream using the command on centos 7 :

  from console 1 : ffmpeg -i space.mp4 -vcodec libx264 -tune zerolatency -crf 18 http://localhost:8050/feed1.ffm

  from console 2 : I have started ffserver and it is started listening.

  But when i open http://x.x.x.x:8050/feed1.ffm in browser it shows error :

  File ??feed1.ffm ? not found

  My ffserver.conf file is attached