From 5b6213ef6bf5e0781c83e86926eb0b33a98dc185 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 14 Dec 2013 17:11:21 +0100 Subject: [PATCH] avcodec/vc1dec: fix mby_start for interlaced content Bug-Id: 1100 Bug-Id: ffmpeg/Ticket2531 Cc: libav-stable@libav.org --- libavcodec/vc1dec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c index 890211019a..5005a2148b 100644 --- a/libavcodec/vc1dec.c +++ b/libavcodec/vc1dec.c @@ -652,7 +652,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data, buf_size3 << 3); /* assuming that the field marker is at the exact middle, hope it's correct */ - slices[n_slices].mby_start = s->mb_height >> 1; + slices[n_slices].mby_start = s->mb_height + 1 >> 1; n_slices1 = n_slices - 1; // index of the last slice of the first field n_slices++; break; @@ -700,7 +700,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data, buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, slices[n_slices].buf); init_get_bits(&slices[n_slices].gb, slices[n_slices].buf, buf_size3 << 3); - slices[n_slices].mby_start = s->mb_height >> 1; + slices[n_slices].mby_start = s->mb_height + 1 >> 1; n_slices1 = n_slices - 1; n_slices++; }