Fix video 'pred_only' issue

Author: LiheYoung

README.md

@@ -82,7 +82,7 @@ python run.py --encoder vitl --img-path assets/examples --outdir depth_vis
 **If you want to use Depth Anything V2 on videos:**
 
 ```bash
-python run_video.py --encoder vitl --video-path assets/examples_video --outdir video_depth_vis
+python run_video.py --encoder <vits | vitb | vitl> --video-path assets/examples_video --outdir video_depth_vis [--input-size <size>] [--pred-only] [--grayscale]
 ```
 
 *Please note that our larger model has better temporal consistency on videos.*

run_video.py

@@ -56,7 +56,11 @@
         raw_video = cv2.VideoCapture(filename)
         frame_width, frame_height = int(raw_video.get(cv2.CAP_PROP_FRAME_WIDTH)), int(raw_video.get(cv2.CAP_PROP_FRAME_HEIGHT))
         frame_rate = int(raw_video.get(cv2.CAP_PROP_FPS))
-        output_width = frame_width * 2 + margin_width
+        
+        if args.pred_only: 
+            output_width = frame_width
+        else: 
+            output_width = frame_width * 2 + margin_width
 
         output_path = os.path.join(args.outdir, os.path.splitext(os.path.basename(filename))[0] + '.mp4')
         out = cv2.VideoWriter(output_path, cv2.VideoWriter_fourcc(*"mp4v"), frame_rate, (output_width, frame_height))