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• Convert ts to mp4 with C++ code of FFMPEG

  28 mai 2016, par M.Taha

  I am stuck with conversion of ts file to mp4 file. I am able to convert ts file to mp4 file in ffmpeg with ffmpeg.exe and it’s command line.

  But I have to do ts to mp4 conversion with C++ code using FFMPEG. I am trying to do this but not succeeded from last 5 days.

• Set hls attributes in multiple outputs as seperated piece code

  2 mars 2018, par parsa

  I used this command for create multiple outputs with different qualities in hls format and I mapped the audio for those.

  ffmpeg -i kata.mp4 -filter_complex [0:v]split=4[s0][s1][s2][s3];
  
  [s0]scale=hd720[v0];[s1]scale=hd480[v1];[s2]scale=nhd[v2];[s3]scale=cga[v3] 
  
  -map [v0] -map [v1] -map [v2] -map [v3] -map 0:a -c:v libx264 -c:a aac -f tee 
  
  -hls_list_size 0 -g 48 "[select=\'v:0,a\':f=hls]out.m3u8| [select=\'v:1,a\':f=hls]out-480.m3u8| [select=\'v:2,a\':f=hls]out-360.m3u8| [select=\'v:3,a\':f=hls]out-200.m3u8"

  in my command -hls_list_size not work.
  I think I must be use this attribute as a seperated piece code for every outputs ,but I don’t know how can I do that,Or what is the syntax code for that.
  Can anyone help me ?

• Erros in compiling and running FFmpeg C example code

  11 juillet 2019, par Tina J

  I’ve been trying to change an FFmpeg’s example code HERE to call other filters using its C APIs. Say the filter be freezedetect=n=-60dB:d=8 which normally runs like this :

  ffmpeg -i small.mp4 -vf "freezedetect=n=-60dB:d=8" -map 0:v:0 -f null -

  And prints outputs like this :

  [freezedetect @ 0x25b91c0] lavfi.freezedetect.freeze_start: 5.005
  
  [freezedetect @ 0x25b91c0] lavfi.freezedetect.freeze_duration: 2.03537
  
  [freezedetect @ 0x25b91c0] lavfi.freezedetect.freeze_end: 7.04037

  However, the original example displays frames, not these metadata information. How can I change the code to print this metadata information (and not the frames) ?

  I’ve been trying to change the display_frame function below into a display_metadata function. Looks like the frame variable has a metadata dictionary which looks promising, but my attempts failed to use it. I’m also new to C language.

  Original display_frame function :

  static void display_frame(const AVFrame *frame, AVRational time_base)
  
  {
  
      int x, y;
  
      uint8_t *p0, *p;
  
      int64_t delay;
  
  
  
      if (frame->pts != AV_NOPTS_VALUE) {
  
          if (last_pts != AV_NOPTS_VALUE) {
  
              /* sleep roughly the right amount of time;
  
               * usleep is in microseconds, just like AV_TIME_BASE. */
  
              delay = av_rescale_q(frame->pts - last_pts,
  
                                   time_base, AV_TIME_BASE_Q);
  
              if (delay > 0 && delay < 1000000)
  
                  usleep(delay);
  
          }
  
          last_pts = frame->pts;
  
      }
  
  
  
      /* Trivial ASCII grayscale display. */
  
      p0 = frame->data[0];
  
      puts("\033c");
  
      for (y = 0; y < frame->height; y++) {
  
          p = p0;
  
          for (x = 0; x < frame->width; x++)
  
              putchar(" .-+#"[*(p++) / 52]);
  
          putchar('\n');
  
          p0 += frame->linesize[0];
  
      }
  
      fflush(stdout);
  
  }

  My new display_metadata function that needs to be completed :

  static void display_metadata(const AVFrame *frame)
  
  {
  
  
  
  //    printf("%d\n",frame->height);
  
  
  
      AVDictionary* dic = frame->metadata;
  
  
  
      printf("%d\n",*(dic->count));
  
  
  
  //    fflush(stdout);
  
  }