Allow encoding frames with more than 2800 lines.

Patch by Martin Fiedler, martin fiedler gmx net 


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19927 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/mpeg12enc.c

@@ -327,7 +327,12 @@ static av_always_inline void put_qscale(MpegEncContext *s)
 }
 
 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
+    if (s->height > 2800) {
+        put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
+        put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
+    } else {
     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
+    }
     put_qscale(s);
     put_bits(&s->pb, 1, 0); /* slice extra information */
 }