mpegaudio_parser: be less picky on the start position

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

libavcodec/mpegaudio_parser.c

@@ -66,7 +66,8 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
 
                 ret = ff_mpa_decode_header(avctx, state, &sr, &channels, &frame_size, &bit_rate);
                 if (ret < 4) {
-                    s->header_count= -2;
+                    if(i > 4)
+                        s->header_count= -2;
                 } else {
                     if((state&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
                         s->header_count= -3;