Add PIX_FMT_VDPAU_MPEG4 to pixdesc.c.

Originally committed as revision 20509 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/pixdesc.c

@@ -438,6 +438,12 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[PIX_FMT_NB] = {
         .log2_chroma_h = 1,
         .flags = PIX_FMT_HWACCEL,
     },
+    [PIX_FMT_VDPAU_MPEG4] = {
+        .name = "vdpau_mpeg4",
+        .log2_chroma_w = 1,
+        .log2_chroma_h = 1,
+        .flags = PIX_FMT_HWACCEL,
+    },
     [PIX_FMT_RGB48BE] = {
         .name = "rgb48be",
         .nb_channels  = 3,