diff --git a/converter/converter.py b/converter/converter.py
index 8fee5be..44c6862 100644
--- a/converter/converter.py
+++ b/converter/converter.py
@@ -90,6 +90,7 @@ class MediaDetector:
             ]
             result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, check=True)
             data = json.loads(result.stdout)
+            logging.debug("detect_media_type ffprobe output: %s", data)
             streams = data.get("streams", [])
             
             video_streams = []
@@ -104,7 +105,7 @@ class MediaDetector:
             # If there is exactly one video stream with codec 'mjpeg' and audio is present, treat as audio
             if len(video_streams) == 1 and audio_count > 0:
                 codec_name = video_streams[0].get("codec_name", "")
-                if codec_name.lower() == "mjpeg":
+                if codec_name.lower() in ("mjpeg", "jpeg", "jpg", "png", "bmp", "gif", "tiff", "heif", "heic"):
                     return "audio"
             
             # Otherwise, if any video stream is not an attached picture, treat as video