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• swr_resamble() Receive First-Chance Exception Notifications

  5 janvier 2019, par RekiDunois

  I am using ffmpeg to resample the pcm data which I record from audio device in windows 10. When I call swr_resample(), visual studio get a First-Chance Exception.

  I thought it might be something wrong with the type of inputdata. Cause It is a void pointer, and swr_convert() need a const uint8_t ** , so I try convert inputdata to a short type pointer, and then convert it to uint8_t, and dump the data to a pcm file, the pcm file can be listened when I set correct parameter. but swr_resamble still can’t work.

  audio_resamble(void *inputdata, void *outputdata, int input_sample_rate)
  
  {
  
      AVFrame *outputframe;
  
      struct SwrContext *swr_ctx;
  
      int in_nb_samples = 441;
  
      outputframe = av_frame_alloc();
  
      outputframe->nb_sample = 480;
  
      outputframe->format = AV_SAMPLE_FMT_S16;
  
      outputframe->channel_layout = AV_CH_LAYOUT_STEREO;
  
      /*alloc swrcontext*/
  
      swr_alloc_set_opts(swr_ctx, 2, outputframe->format, 44100, 
  
                         2, AV_SAMPLE_FMT_FLT, input_sample_rate, 0, NULL);
  
      swr_convert(swr_ctx, outputdata, outputframe->nb_samples,
  
                 (const uint8_t **)inputdata, in_nb_samples); 
  
      // when code run here, visual studio get a First-Chance Exception
  
  }

• Node JS Fluent Ffmpeg Stream Portion of Audio file

  10 octobre 2016, par user3732493

  I am trying to stream a small section of an audio file. I am using NodeJS (with Express) and ffmpeg (fluent-ffmpeg) to clip the song to a given start and end time.

  Is there a way to keep this clipped portion of the song in memory and stream it ?

• How to change part of a MKV video with another MKV video without re-encode and without changing audio file of the primary MKV file [closed]

  10 octobre 2020, par MonsterMMORPG

  I have a lecture that I have recorded with using OBS studio and my microphone

  


  But I want to replace certain part of that video with another video without re-encoding or touching the audio

  


  The another video is also recorded with OBS studio with the same settings

  


  If encoding is necessary I accept that as well

  


  So what would be the appropriate ffmpeg command ?

  


  Here example file definitions and durations to give more clear example

  


  


  • a.mkv : 77 minutes long

    


  


  • b.mkv : same format and 2 minutes long

    


  


  • c.mkv : I want to replace 00.23.00 - 00.25.00 part of a.mkv with b.mkv without changing the audio file of a.mkv

    


  


  


  Is this possible without encoding or with re-encoding ?

  


  So can you provide an example code with some definitions

  


  How do we define starting position, the durations ? I found some examples on the Internet but they were not definitive enough

  


  Answer to this question : https://superuser.com/questions/1591877/how-to-change-part-of-a-mkv-video-with-another-mkv-video-without-re-encode-and-w