@@ -185,6 +185,8 @@ static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
flag(motion_vectors_over_pic_boundaries_flag);
ue(max_bytes_per_pic_denom, 0, 16);
ue(max_bits_per_mb_denom, 0, 16);
+ // The current version of the standard constrains this to be in
+ // [0,15], but older versions allow 16.
ue(log2_max_mv_length_horizontal, 0, 16);
ue(log2_max_mv_length_vertical, 0, 16);
ue(max_num_reorder_frames, 0, H264_MAX_DPB_FRAMES);
@@ -193,8 +195,8 @@ static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
infer(motion_vectors_over_pic_boundaries_flag, 1);
infer(max_bytes_per_pic_denom, 2);
infer(max_bits_per_mb_denom, 1);
- infer(log2_max_mv_length_horizontal, 16);
- infer(log2_max_mv_length_vertical, 16);
+ infer(log2_max_mv_length_horizontal, 15);
+ infer(log2_max_mv_length_vertical, 15);
if ((sps->profile_idc == 44 || sps->profile_idc == 86 ||
sps->profile_idc == 110 || sps->profile_idc == 110 ||
@@ -491,8 +491,8 @@ static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
sps->vui.bitstream_restriction_flag = 1;
sps->vui.motion_vectors_over_pic_boundaries_flag = 1;
- sps->vui.log2_max_mv_length_horizontal = 16;
- sps->vui.log2_max_mv_length_vertical = 16;
+ sps->vui.log2_max_mv_length_horizontal = 15;
+ sps->vui.log2_max_mv_length_vertical = 15;
sps->vui.max_num_reorder_frames = (ctx->b_per_p > 0);
sps->vui.max_dec_frame_buffering = sps->max_num_ref_frames;