and Accompaniment Quality by a large margin, indicating
our decoupling generation of melody and accompaniment
significantly improves their qualities. The subjective eval-
uation results show high correlations with VMCP, which
further verifies the effectiveness of our proposed metric.
6.4. Ablation Study
Ablation on Video Controller. We ablate the three video
control features and evaluate the video-music correspon-
dence with VMCP: (1) w/o semantic: no semantic feature
input for video controller; (2) w/o color: no color feature
input for video controller; (3) w/o motion: fix tempo and
do not add timing encoding. As shown in Tab. 2, semantic
and motion features are significant for correspondence. We
observe that w/o color has similar correspondence with the
full model despite lower music quality. We attribute this to
the fact that music tonality is connected with the color of
videos. The original keys have already recorded the infor-
VideoBackgroundMusicGeneration