code: plan9front

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file: ftyp mp4* is video/mp4 as well

--- a/sys/src/cmd/file.c

+++ b/sys/src/cmd/file.c

@@ -1251,7 +1251,7 @@

 		return 0;

 	if(memcmp(&buf[4], "ftyp", 4) != 0)

 		return 0;

-	if(memcmp(&buf[8], "isom", 4) == 0){

+	if(memcmp(&buf[8], "isom", 4) == 0 || memcmp(&buf[8], "mp4", 3) == 0){

 		print("%s\n", mime ? "video/mp4" : "mp4 video");

 		return 1;

 	}