DrKLO/Telegram · warning

Sampling rate must be 8000, 12000, 16000, 24000, or 48000\n

Error message

Sampling rate must be 8000, 12000, 16000, 24000, or 48000\n

What it means

The -r rate2 value is not one of the five Opus-supported sample rates. opus_compare only operates at 8000, 12000, 16000, 24000, or 48000 Hz because those are the only rates for which the psychoacoustic band tables (ybands) are defined.

Solutions

1. Use one of the five supported rates with -r.
2. Resample the input .sw files to a supported rate before comparing.
3. Omit -r entirely to default to 48000.

Example fix

// before
./opus_compare -r 44100 file1.sw file2.sw

// after
./opus_compare -r 48000 file1.sw file2.sw

// Validate the rate against the allowed set.
if (rate!=8000&&rate!=12000&&rate!=16000&&rate!=24000&&rate!=48000) {
    fprintf(stderr, "Sampling rate must be 8000, 12000, 16000, 24000, or 48000\n");
    return EXIT_FAILURE;
}

When it happens

Trigger: rate (from atoi(_argv[2]) after -r) is not in {8000,12000,16000,24000,48000}. The tool then exits before opening any file. The default rate is 48000 if -r is omitted.

Common situations: Passing a common-but-unsupported rate like 22050 or 44100; passing a non-numeric string that atoi turns into 0; typo in the rate.

Related errors

• Sample counts do not match (%lu!=%lu).\n
• bytes per packet must be between 0 and
• Error: encoder doesn't match decoder\n
• Error opening ' '.\n
• failed to create a mode\n

AI-assisted analysis of DrKLO/Telegram@45ab8f4308 (2026-08-14). Data as JSON: /api/errors/7d88ed8a0e450f7b. Report an issue: GitHub.

Appendix: source

Thrown at TMessagesProj/jni/opus/src/opus_compare.c:205

  int      max_compare;
  if(_argc<3||_argc>6){
    fprintf(stderr,"Usage: %s [-s] [-r rate2] <file1.sw> <file2.sw>\n",
     _argv[0]);
    return EXIT_FAILURE;
  }
  nchannels=1;
  if(strcmp(_argv[1],"-s")==0){
    nchannels=2;
    _argv++;
  }
  rate=48000;
  ybands=NBANDS;
  yfreqs=NFREQS;
  downsample=1;
  if(strcmp(_argv[1],"-r")==0){
    rate=atoi(_argv[2]);
    if(rate!=8000&&rate!=12000&&rate!=16000&&rate!=24000&&rate!=48000){
      fprintf(stderr,
       "Sampling rate must be 8000, 12000, 16000, 24000, or 48000\n");
      return EXIT_FAILURE;
    }
    downsample=48000/rate;
    switch(rate){
      case  8000:ybands=13;break;
      case 12000:ybands=15;break;
      case 16000:ybands=17;break;
      case 24000:ybands=19;break;
    }
    yfreqs=NFREQS/downsample;
    _argv+=2;
  }
  fin1=fopen(_argv[1],"rb");
  if(fin1==NULL){
    fprintf(stderr,"Error opening '%s'.\n",_argv[1]);
    return EXIT_FAILURE;
  }

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