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.

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;
  }

View on GitHub (pinned to 45ab8f4308)

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
• failed to create a mode\n
• bytes per packet must be between 0 and %d\n
• Failed to create the encoder: %s\n
• Failed to create the decoder: %s\n

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