avcodec/mpeg12enc: Favor storing DAR instead of SAR

fixes Ticket 2689
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpeg12enc.c

@@ -264,7 +264,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
 
             error = FFABS(error);
 
-            if (error < best_aspect_error) {
+            if (error <= best_aspect_error) {
                 best_aspect_error    = error;
                 s->aspect_ratio_info = i;
             }