download button for all output modes

app.py

@@ -452,6 +452,7 @@ def process_video(video_path, resolution, despill_val, mask_mode,
             if not ok:
                 raise gr.Error("Video encoding failed. No suitable codec found.")
             output_video = out_path
+            output_file = out_path
 
         elif need_alpha:
             out_path = os.path.join(tmpdir, "alpha_matte.mp4")
@@ -461,6 +462,7 @@ def process_video(video_path, resolution, despill_val, mask_mode,
             if not ok:
                 raise gr.Error("Video encoding failed. No suitable codec found.")
             output_video = out_path
+            output_file = out_path
 
         elif output_mode == "Transparent video (WebM)":
             out_path = os.path.join(tmpdir, "transparent.webm")
@@ -470,6 +472,7 @@ def process_video(video_path, resolution, despill_val, mask_mode,
             if not ok:
                 raise gr.Error("WebM encoding failed. ffmpeg with libvpx-vp9 required.")
             output_video = out_path
+            output_file = out_path
 
         elif output_mode == "PNG sequence (ZIP)":
             zip_path = os.path.join(tmpdir, "rgba_sequence.zip")