use white padding

app.py

@@ -108,7 +108,7 @@ padding = 2
 font_size = 20
 num_cols = len(selected_models)
 crop_str = "crop=trunc(iw/2)*2:trunc(ih/2)*2"
-pad_str = "pad=ceil(iw/2)*2+{}:ceil(ih/2)*2+{}:{}:{}".format(padding*2, padding*2, padding, padding)
+pad_str = "pad=ceil(iw/2)*2+{}:ceil(ih/2)*2+{}:{}:{}:white".format(padding*2, padding*2, padding, padding)
 num_elements = num_rows * num_cols
 
 # remove previous temp data
@@ -193,7 +193,8 @@ layout_str = "|".join(layout_parts)
 
 # opt = "-c:v libx264 -preset veryslow -crf 18 -c:a copy"
 opt = ""
-opt_fill = ":fill=black"
+# opt_fill = ":fill=black"
+opt_fill = ":fill=white"
 # opt_fill = ""
 ffmpeg_command_str = "ffmpeg -y " + inputs_str + " -filter_complex \"" + input_scaling_str + ";" + xstack_input_str + "xstack=inputs=" + str(num_inputs) + ":layout=" + layout_str + opt_fill + "\"" + opt + " output.mp4"
 print(ffmpeg_command_str)