https://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=31265
diff --git a/MagickCore/coder.c b/MagickCore/coder.c
index 40bc475..2cfcaa2 100644
--- a/MagickCore/coder.c
+++ b/MagickCore/coder.c
@@ -83,7 +83,8 @@
   CoderMap[] =
   {
     { "3FR", "DNG" },
-    { "8BIM", "META" },
+    { "3GP", "MPEG" },
+    { "3G2", "MPEG" },
     { "8BIMTEXT", "META" },
     { "8BIMWTEXT", "META" },
     { "AFM", "TTF" },