Add 16cif video frame size abbreviation. i.e. -s alias for 1408x1152.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18301 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

doc/ffmpeg-doc.texi

@@ -360,6 +360,8 @@ The following abbreviations are recognized:
 352x288
 @item 4cif
 704x576
+@item 16cif
+1408x1152
 @item qqvga
 160x120
 @item qvga

libavcodec/utils.c

@@ -1009,6 +1009,7 @@ static const VideoFrameSizeAbbr video_frame_size_abbrs[] = {
     { "qcif",      176, 144 },
     { "cif",       352, 288 },
     { "4cif",      704, 576 },
+    { "16cif",    1408,1152 },
     { "qqvga",     160, 120 },
     { "qvga",      320, 240 },
     { "vga",       640, 480 },