2018-05-18 17:06 GMT+02:00, Jerome Borsboom <jerome.borsb...@carpalis.nl>:
> For interlace field pictures s->mb_height indicates the height of the full
> picture in MBs, i.e. the two fields combined. A single field is half this
> size. When calculating mquant for interlace field pictures, the bottom edge
> is the last MB row of the field.
>
> Signed-off-by: Jerome Borsboom <jerome.borsb...@carpalis.nl>
> ---
> libavcodec/vc1_block.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c
> index daf30fdbfe..aa2ea5024e 100644
> --- a/libavcodec/vc1_block.c
> +++ b/libavcodec/vc1_block.c
> @@ -181,7 +181,8 @@ static void vc1_put_signed_blocks_clamped(VC1Context *v)
> mquant = -v->altpq; \
> if ((edges&4) && s->mb_x == (s->mb_width - 1)) \
> mquant = -v->altpq; \
> - if ((edges&8) && s->mb_y == (s->mb_height - 1)) \
> + if ((edges&8) && \
> + s->mb_y == ((s->mb_height >> v->field_mode) - 1)) \
> mquant = -v->altpq; \
> if (!mquant || mquant > 31) { \
> av_log(v->s.avctx, AV_LOG_ERROR, \
Patch applied.
Thank you, Carl Eugen
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