diff --git a/transcription-tool/backend/services/ffmpeg_service.py b/transcription-tool/backend/services/ffmpeg_service.py
index e1b86bae..1c6b84c3 100644
--- a/transcription-tool/backend/services/ffmpeg_service.py
+++ b/transcription-tool/backend/services/ffmpeg_service.py
@@ -21,7 +21,8 @@ class FFmpegService:
             "ffmpeg", "-i", input_path,
             "-f", "segment",
             "-segment_time", str(settings.CHUNK_DURATION_SEC),
-            "-c", "copy",
+            "-c:a", "libmp3lame", # Re-encode to MP3 for compatibility
+            "-b:a", "256k", # Set a reasonable bitrate for quality
             output_pattern
         ]