I420 patch by (Sebastien Bechet <s dot bechet at av7 dot net>)

Originally committed as revision 1710 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/raw.c

@@ -32,6 +32,7 @@ typedef struct PixleFormatTag {
 
 const PixelFormatTag pixelFormatTags[] = {
     { PIX_FMT_YUV422, MKTAG('Y', '4', '2', '2') },
+    { PIX_FMT_YUV420P, MKTAG('I', '4', '2', '0') },
     { -1, 0 },
 };
 

libavformat/avienc.c

@@ -139,6 +139,7 @@ const CodecTag codec_bmp_tags[] = {
     { CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
     { CODEC_ID_CYUV, MKTAG('c', 'y', 'u', 'v') },
     { CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
+    { CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
     { 0, 0 },
 };