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• "Error : more samples than frame size" while encoding audio to opus codec using FFMPEG

  28 avril 2023, par lokit khemka

  I am converting audio from codec AAC to Opus using libavcodec library of FFMPEG. The input codec details are as follows : Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 6 channels, fltp, 391 kb/s (default)

  


  The codec options that I have used for the output encoding are as follows :

  


      int OUTPUT_CHANNELS = 2;
    int OUTPUT_BIT_RATE = 32000;
int sample_rate = 48000;
    encoder_sc->audio_avcc->channels = OUTPUT_CHANNELS;
    encoder_sc->audio_avcc->channel_layout = av_get_default_channel_layout(OUTPUT_CHANNELS);
    encoder_sc->audio_avcc->sample_rate = sample_rate;
    encoder_sc->audio_avcc->sample_fmt = encoder_sc->audio_avc->sample_fmts[0];
    encoder_sc->audio_avcc->bit_rate = OUTPUT_BIT_RATE;
    encoder_sc->audio_avcc->time_base = (AVRational){1, sample_rate};


  


  I am using the code in the file as it is, with minimal changes : https://github.com/leandromoreira/ffmpeg-libav-tutorial/blob/master/3_transcoding.c for reference. Look for the function prepare_audio_encoder in the file.

  


  When the run the program, I keep getting the error : " more samples than frame size". I don't know much about Audio Processing, so I cannot debug this error. Any help is greatly appreciated.

  


• avfilter/af_afir : adjust min partition size

  5 janvier 2019, par Paul B Mahol

  avfilter/af_afir : adjust min partition size
  Minimal value allowed by our FFT is 16 thus min partition size is 8.
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/af_afir.c

• If conditions in a loop breaking ffmpeg zoom command

  6 mai 2017, par Sulli

  I have built a bash script where I am trying to zoom in an image with ffmpeg, for 10s :

  ffmpeg -r 25 -i image0.jpg -filter_complex "scale=-2:10*ih,zoompan=z='min(zoom+0.0015,1.5)':d=250:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)',scale=-2:720"  -y -shortest -c:v libx264 -pix_fmt yuv420p temp_1.mp4 

  This command is included in a while loop, with two "if" conditions at the beginning of the loop :

  first=1017 
  
  i=0
  
  while read status author mySource myFormat urlIllustration credit shot_id originalShot categories title_EN length_title_EN text_EN tags_EN title_FR length_title_FR text_FR tags_FR title_BR length_title_BR text_BR tags_BR; do
  
  
  
      if [ $myFormat != "diaporama" ]; then 
  
          let "i = i + 1"
  
          continue
  
      fi
  
  
  
      if [ "$shot_id" -lt "$first" ]; then 
  
          let "i = i + 1"
  
          continue
  
      fi
  
  
  
      rm temp_1.mp4
  
      ffmpeg -r 25 -i image0.jpg -filter_complex "scale=-2:10*ih,zoompan=z='min(zoom+0.0015,1.5)':d=250:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)',scale=-2:720"  -y -shortest -c:v libx264 -pix_fmt yuv420p temp_1.mp4 
  
  
  
  
  
      let "i = i + 1"
  
  done <../data.tsv
  
  echo "All done."

  (I have removed stuff in the loop, this is the minimal code that is able to capture the problem).

  Now the weird bug : if I run this code like that, the video I am trying to generate will not be 10s long, only 1-2s long. ffmpeg exits with error "[out_0_0 @ 0x2fa4c00] 100 buffers queued in out_0_0, something may be wrong."

  Now if I remove one of the "if" conditions at the beginning of my loop (the first or the second, it doesn’t matter), the video will be generated fine and be 10s long.

  What could be the cause of this problem ?