Added some comments to describe what each extension was being used for

diff --git a/mkv_extract_chapter b/mkv_extract_chapter
index 1d969e8350145467d0c2b7ffdd363e4fcca23736..142b8ecb496722677a64d561bed10dfe07827938 100755 (executable)
--- a/mkv_extract_chapter
+++ b/mkv_extract_chapter
@@ -83,8 +83,11 @@ sub detect_ext {
        }
     }
 
+    # Quicktime/MOV
     if($h264 && $pcm_s16le) { return "mov"; }
+    # MTS
     if($h264_high && $ac3) { return "mp4"; }
+    # 3GP/MP4
     if($h264 && $aac) { return "mp4"; }
 
     return "UNKNOWN";