lavc SVT HEVC: disable UnrestrictedMotionVector

Together with tiles setting, it should enable Motion Constrained Tile
Sets (MCTS) that should allow independed tile decoding. But it doesn't
seem to be currently the case with FFmpeg HEVC decodeer.

Author: MartinPulec

src/video_compress/libavcodec.cpp

@@ -1889,6 +1889,7 @@ static void configure_svt(AVCodecContext *codec_ctx, struct setparam_param *para
                         check_av_opt_set<int>(codec_ctx->priv_data, "tile_row_cnt", tile_row_cnt);
                         check_av_opt_set<int>(codec_ctx->priv_data, "tile_col_cnt", tile_col_cnt);
                         check_av_opt_set<int>(codec_ctx->priv_data, "tile_slice_mode", 1);
+                        check_av_opt_set<int>(codec_ctx->priv_data, "umv", 0);
                 }
         } else if ("libsvtav1"s == codec_ctx->codec->name) {
 #if LIBAVCODEC_VERSION_INT > AV_VERSION_INT(59, 21, 100)