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• FFMPEG, the penultimate image from the .txt file doesn't show in the video

  25 octobre 2019, par ArmKh

  I’m trying to create a video from the images using ffmeg. Actually, the creating of the video works but there is a small problem. I have a text file with the names of the images (paths) which I’m using in the video. The file looks like this

  file 'image1.jpg'
  
  file 'image2.jpg'
  
  file 'image3.jpg'
  
  file 'image4.jpg'
  
  file 'image5.jpg'

  And the ffmeg command is following

  ffmpeg -y -r 1/5 -f concat -safe 0 -i imagenames.txt -i some_audio.mp3 -c:v libx264 -vf fps=30 -pix_fmt yuv420p -t 30 output.mp4

  This video should keep the frame on every image for 5 seconds. But the problem is the penultimate image ( image4 in this case ) is not being shown in the video. So, it keeps on image3 10 seconds and moves to image5

  So, the video in seconds looks like this

  [image1] -> [image2] -> [image3] -> [image4] -> [image5]
  5sec        5sec       10sec        0sec        5sec

  And the problem is not with the image4 exactly. In case of swapping image3 and image4, the video will skip image3

  [image1] -> [image2] -> [image4] -> [image3] -> [image5]
  5sec        5sec       10sec        0sec        5sec

  Hope you’ll have any suggestions to fix this issue

• 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)