need additional form field in case of non-admin filepath option.

I'm 'cheating' a little and saving a node programmatically, so I'm not positive that this issue would affect a 'stock' user of this great module. However, in my case, if an owner tries to edit their video node they are unable to pass validation due to a missing filepath. untested fix follows:

change

if(!$node->nid ||  
		user_access('administer video content') ||
		variable_get('op_video_node_allow_replace', OP_VIDEO_NODE_DEFAULT_ALLOW_REPLACE))
	{
		switch(variable_get('op_video_node_widget', OP_VIDEO_NODE_DEFAULT_WIDGET)) {
		
			case 'upload':
				$form['_op_video_upload'] = array(
					'#type' => 'file', 
					'#title' => t('Video upload'), 
					'#description' => 'Max size: ' . _op_video_upload_max_size(),
			    '#weight' => -4
				);

				$form['#attributes']['enctype'] = 'multipart/form-data';
				break;
				
			case 'filepath':
        $form['filepath'] = array(
          '#type' => 'textfield',
          '#title' => t('Video filepath'),
					'#autocomplete_path' => 'op_video/autocomplete',
          '#default_value' => $node->video->source_file->filepath,
          '#required' => TRUE,
			    '#weight' => -4
        );
				break;
		}
	}
  
 

to

if(!$node->nid ||  
		user_access('administer video content') ||
		variable_get('op_video_node_allow_replace', OP_VIDEO_NODE_DEFAULT_ALLOW_REPLACE))
	{
		switch(variable_get('op_video_node_widget', OP_VIDEO_NODE_DEFAULT_WIDGET)) {
		
			case 'upload':
				$form['_op_video_upload'] = array(
					'#type' => 'file', 
					'#title' => t('Video upload'), 
					'#description' => 'Max size: ' . _op_video_upload_max_size(),
			    '#weight' => -4
				);

				$form['#attributes']['enctype'] = 'multipart/form-data';
				break;
				
			case 'filepath':
        $form['filepath'] = array(
          '#type' => 'textfield',
          '#title' => t('Video filepath'),
					'#autocomplete_path' => 'op_video/autocomplete',
          '#default_value' => $node->video->source_file->filepath,
          '#required' => TRUE,
			    '#weight' => -4
        );
				break;
		}
	}
  
 else { //we need this to pass validation.
   $form['filepath']=array('#type'=>'hidden','#value'=>$node->video->source_file->filepath); 
  }

haven't fully tested the implications of this but it seems to work alright. sorry for being a little vague in this description (in the middle of a massive bugfix run), but hopefully the code change makes my issue obvious enough.