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Optimize audio context length for short recordings #3532

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Optimize audio context length for short recordings #3532

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Optimize audio context length for short recordings
nchudleigh Nov 19, 2025
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nchudleigh Nov 19, 2025
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12 changes: 11 additions & 1 deletion src/whisper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6800,6 +6800,16 @@ int whisper_full_with_state(

result_all.clear();

// if not explicitly set by user, scale audio_ctx for short recordings
if (params.audio_ctx == 0) {
const double audio_length_seconds = (double)n_samples / WHISPER_SAMPLE_RATE;
if (audio_length_seconds <= 30.0) {
int audio_context = std::max(768, std::min((int)(audio_length_seconds / 30.0 * 1500.0) + 128, 1500));
params.audio_ctx = audio_context;
WHISPER_LOG_DEBUG("%s: Audio context length: %d for %.1fs of audio\n", __func__, audio_context, audio_length_seconds);
}
}

if (n_samples > 0) {
// compute log mel spectrogram
if (whisper_pcm_to_mel_with_state(ctx, state, samples, n_samples, params.n_threads) != 0) {
Expand Down Expand Up @@ -9000,4 +9010,4 @@ static void whisper_log_callback_default(ggml_log_level level, const char * text
#endif
fputs(text, stderr);
fflush(stderr);
}
}