Detect incorrect padding with wrong stuffing codes used by NEC N-02B.

I dont know if this is the best way to handle it. But it fixes http://kuwatan.jp/temp/n-02b.3gp

Fixes issue 2373.

Originally committed as revision 25875 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263dec.c

@@ -261,6 +261,13 @@ static int decode_slice(MpegEncContext *s){
 
     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 
+    if(s->codec_id==CODEC_ID_MPEG4
+       && (s->workaround_bugs&FF_BUG_AUTODETECT)
+       && get_bits_left(&s->gb) >= 48
+       && show_bits(&s->gb, 24)==0x4010
+       && !s->data_partitioning)
+        s->padding_bug_score+=32;
+
     /* try to detect the padding bug */
     if(      s->codec_id==CODEC_ID_MPEG4
        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)