diff --git a/etc/codecs.conf b/etc/codecs.conf
index 3f1429b2ba..28e841ac5e 100644
--- a/etc/codecs.conf
+++ b/etc/codecs.conf
@@ -15,7 +15,7 @@ release 20030119
 videocodec theora
   info "Theora (free, reworked VP3)"
   status working
-  fourcc theo
+  fourcc theo,Thra
   format 0xFFFC
   driver theora
   dll libtheora
@@ -971,6 +971,7 @@ videocodec ffvp3
   info "FFmpeg's VP3-Codec"
   status untested
   fourcc VP30,vp30,VP31,vp31
+  format 0x20335056 ; "VP3 " (used in .nsv files)
   driver ffmpeg
   dll "vp3"
   out YV12
@@ -1687,6 +1688,7 @@ audiocodec mp3
   format 0x55        ; layer-3
   format 0x33706d2e  ; ".mp3" CBR/VBR MP3 (MOV files)
   format 0x5500736d  ; "ms\0\x55" older mp3 fcc (MOV files)
+  format 0x2033504D  ; "MP3 " (used in .nsv files)
   driver mp3lib
   flags seekable