add padding

app.py

@@ -123,20 +123,19 @@ for row_idx in range(num_rows):
 inputs_str = " ".join(["-i " + video_path for video_path in video_paths])
 
 crop_str = "crop=trunc(iw/2)*2:trunc(ih/2)*2"
+pad_str = "pad=ceil(iw/2)*2+4:ceil(ih/2)*2+4:2:2"
 
 w = selected_dataset["width"]
 input_scaling_parts = []
 xstack_input_parts = []
 for i in range(num_elements):
-    input_scaling_part = "[{}:v]scale={}:-1,{}[v{}]".format(i, w, crop_str, i)
+    input_scaling_part = "[{}:v]scale={}:-1,{}[v{}]".format(i, w, pad_str, i)
     input_scaling_parts.append(input_scaling_part)
     xstack_input_part = "[v{}]".format(i)
     xstack_input_parts.append(xstack_input_part)
 input_scaling_str = ";".join(input_scaling_parts)
 xstack_input_str = "".join(xstack_input_parts)
 
-
-
 # opt = "-c:v libx264 -preset veryslow -crf 18 -c:a copy"
 opt = ""
 ffmpeg_command_str = "ffmpeg -y " + inputs_str + " -filter_complex \"" + input_scaling_str + ";" + xstack_input_str + "xstack=inputs=" + str(num_elements) + ":layout=" + layout_str + "\"" + opt + " output.mp4"