code: public T setAudioSampleRate(int sample_rate) {
      checkArgument(sample_rate > 0, "sample rate must be positive");
      this.audio_enabled = true;
      this.audio_sample_rate = sample_rate;
      return getThis();
    }
docs: Sets the Audio sample rate, for example 44_000.
  
  @param sample_rate Samples measured in Hz
  @return this
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_8000
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_11025
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_12000
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_16000
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_22050
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_32000
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_44100
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_48000
  @see net.bramp.ffmpeg.FFmpeg#AUDIO_SAMPLE_96000