diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c index 02f59551f4..50440d18a8 100644 --- a/libavcodec/h263dec.c +++ b/libavcodec/h263dec.c @@ -220,9 +220,15 @@ static int h263_decode_frame(AVCodecContext *avctx, if (h > 16) h = 16; offset = y * s->linesize; - src_ptr[0] = s->current_picture[0] + offset; - src_ptr[1] = s->current_picture[1] + (offset >> 2); - src_ptr[2] = s->current_picture[2] + (offset >> 2); + if(s->pict_type==B_TYPE || (!s->has_b_frames)){ + src_ptr[0] = s->current_picture[0] + offset; + src_ptr[1] = s->current_picture[1] + (offset >> 2); + src_ptr[2] = s->current_picture[2] + (offset >> 2); + } else { + src_ptr[0] = s->last_picture[0] + offset; + src_ptr[1] = s->last_picture[1] + (offset >> 2); + src_ptr[2] = s->last_picture[2] + (offset >> 2); + } avctx->draw_horiz_band(avctx, src_ptr, s->linesize, y, s->width, h); }