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• ffmpeg libfdk-aac open coder error and show The encoder timebase is not set

  28 octobre 2019, par RodSteward

  I try to encode some pcm data,and I compile ffmpeg for myself with libfdk-aac,but When I use a aac encoder,It shows timebase is not set,but aac data seems not need a timebase,and even I set the timebase,it shows the same error again

  here is the Initializationcode :

      AVCodec *pCodec;
  
      AVCodecContext *pCodecCtx = NULL;
  
      int i, ret, got_output;
  
      FILE *fp_in;
  
      FILE *fp_out;
  
  
  
      AVFrame *pFrame;
  
      uint8_t* frame_buf;
  
      int size = 0;
  
  
  
      AVPacket pkt;
  
      int y_size;
  
      int framecnt = 0;
  
  
  
      char filename_in[] = "tdjm.pcm";
  
  
  
      AVCodecID codec_id = AV_CODEC_ID_AAC;
  
      char filename_out[] = "tdjm.aac";
  
  
  
      int framenum = 1000;
  
  
  
      avcodec_register_all();
  
  
  
      pCodec = avcodec_find_encoder_by_name("libfdk_aac");
  
      if (!pCodec) {
  
          printf("Codec not found\n");
  
          return -1;
  
      }
  
      pCodecCtx = avcodec_alloc_context3(pCodec);
  
      if (!pCodecCtx) {
  
          printf("Could not allocate video codec context\n");
  
          return -1;
  
      }
  
  
  
      //pCodecCtx->codec_id = codec_id;
  
      pCodecCtx->codec_type = AVMEDIA_TYPE_AUDIO;
  
      pCodecCtx->sample_fmt = AV_SAMPLE_FMT_S16;
  
      pCodecCtx->sample_rate = 44100;
  
      pCodecCtx->channel_layout = AV_CH_LAYOUT_STEREO;
  
      pCodecCtx->channels = av_get_channel_layout_nb_channels(pCodecCtx->channel_layout);
  
      pCodecCtx->bit_rate = 64000;
  
      pCodecCtx->time_base = AVRational{1,10};
  
  
  
      if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
  
          printf("Could not open codec\n");
  
          return -1;
  
      }

• Recorded by FFMpeg Video doesn't show the statistics in details

  28 novembre 2019, par okandnmz

  I use the FFMpeg to record the video I received as input with "Pipe". Although the recording process was successful after recording, no statistics, details are given in the details tab (Right click to recorded video -> properties -> details tab) (Windows 10)

  My FFMpeg commands something like that :

  ffmpeg -vsync 1 -i %PIPE% ....

  For this problem, I’ve already tried the following commands :

  -metadata ....
  
  -vstats ...... 

  Probably i misunderstood that commands so in the result both of them is not working. Should i specify that values (title, fps, bitrate...) in somewhere and for that aim is there any commands ?
  (the recorded video source is not the existing file, its live stream)

• FFmpeg : Adding multiple overlays to the video with the fade in/out effect. Command works but the images ( overlays ) doesn't show in the video

  12 décembre 2019, par ArmKh

  I’m trying to add multiple overlays to the video and fade in/out them separately. So, the command works without any issue but in the video, I can’t see the overlay images

  Here is the command with which I’m trying to do it

  ffmpeg -y -i video.mp4 -loop 1 -i text1.png -loop 1 -i text2.png -loop 1 -i text3.png -loop 1 -i text4.png -loop 1 -i text5.png -filter_complex "
  
  [1]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+5/TB[ovr1];
  
  [2]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+10/TB[ovr2];
  
  [3]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+15/TB[ovr3];
  
  [4]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+20/TB[ovr4];
  
  [5]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+25/TB[ovr5];
  
  [0:v][ovr1]overlay=0:0:enable='between(t,0,5)'[base1];
  
  [base1][ovr2]overlay=0:(main_h-overlay_h)/2:enable='between(t,5,10)'[base2];
  
  [base2][ovr3]overlay=0:(main_h-overlay_h)/2:enable='between(t,10,15)'[base3];
  
  [base3][ovr4]overlay=0:(main_h-overlay_h)/2:enable='between(t,15,20)'[base4];
  
  [base4][ovr5]overlay=0:(main_h-overlay_h)/2:enable='between(t,20,25)'[out]" -map "[out]" -c:v libx264 -c:a copy -flags +global_header -shortest with_overlays.mp4

  Can you please help me to find what am I doing wrong ?