+ // copy all the necessary fields explicitly
+ s->time_increment_bits = s1->time_increment_bits;
+ s->shape = s1->shape;
+ s->vol_sprite_usage = s1->vol_sprite_usage;
+ s->sprite_brightness_change = s1->sprite_brightness_change;
+ s->num_sprite_warping_points = s1->num_sprite_warping_points;
+ s->rvlc = s1->rvlc;
+ s->resync_marker = s1->resync_marker;
+ s->t_frame = s1->t_frame;
+ s->new_pred = s1->new_pred;
+ s->enhancement_type = s1->enhancement_type;
+ s->scalability = s1->scalability;
+ s->use_intra_dc_vlc = s1->use_intra_dc_vlc;
+ s->intra_dc_threshold = s1->intra_dc_threshold;
+ s->divx_version = s1->divx_version;
+ s->divx_build = s1->divx_build;
+ s->xvid_build = s1->xvid_build;
+ s->lavc_build = s1->lavc_build;
+ s->showed_packed_warning = s1->showed_packed_warning;
+ s->vol_control_parameters = s1->vol_control_parameters;
+ s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i;
+ s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p;
+ s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b;
+ s->rgb = s1->rgb;
+
+ memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
+ memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));