ffmpeg also supports RGBA in little and big endian.

modules/codec/ffmpeg/ffmpeg.c

@@ -2,7 +2,7 @@
  * ffmpeg.c: video decoder using ffmpeg library
  *****************************************************************************
  * Copyright (C) 1999-2001 the VideoLAN team
- * $Id$
+ * $Id: 7bacb2eec7f29bf73a418bf3391171df854b78cb $
  *
  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
  *          Gildas Bazin <gbazin@videolan.org>
@@ -464,6 +464,11 @@ static struct
     { VLC_FOURCC('R','V','1','6'), PIX_FMT_RGB565 },
     { VLC_FOURCC('R','V','2','4'), PIX_FMT_RGB24 },
     { VLC_FOURCC('R','V','3','2'), PIX_FMT_RGBA32 },
+#ifdef WORDS_BIGENDIAN
+    { VLC_FOURCC('R','G','B','A'), PIX_FMT_RGB32_1 },
+#else
+    { VLC_FOURCC('R','G','B','A'), PIX_FMT_BGR32 },
+#endif
     { VLC_FOURCC('G','R','E','Y'), PIX_FMT_GRAY8 },
 
     {0}