diff --git a/process_chunks.py b/process_chunks.py
index a6f9e4d..3083581 100755
--- a/process_chunks.py
+++ b/process_chunks.py
@@ -66,9 +66,9 @@ def process_chunk(filename):
 
             event_time = datetime.now().strftime("%Y%m%d-%H%M%S")
             base_name = os.path.splitext(filename)[0]
-            wav_out = os.path.join(OUTPUT_DIR, f"{base_name}_{event_time}.wav")
+            flac_out = os.path.join(OUTPUT_DIR, f"{base_name}_{event_time}.flac")
             png_out = os.path.join(OUTPUT_DIR, f"{base_name}_{event_time}.png")
-            sf.write(wav_out, clip, samplerate)
+            sf.write(flac_out, clip, samplerate, format='FLAC')
 
             plt.figure()
             plt.specgram(clip, Fs=samplerate, NFFT=NFFT, noverlap=NFFT//2, cmap='inferno', vmin=-90, vmax=-20)
@@ -79,7 +79,7 @@ def process_chunk(filename):
             plt.savefig(png_out)
             plt.close()
 
-            print(f"🎯 Ereignis erkannt bei {event_time}, gespeichert: {wav_out}, {png_out}")
+            print(f"🎯 Ereignis erkannt bei {event_time}, gespeichert: {flac_out}, {png_out}")
             last_event = i
             i += skip_samples
         else: