--- plugins/video_ffmpeg_helper/video_render.php	Sun Aug  5 01:03:34 2007
+++ plugins/video_ffmpeg_helper/video_render-patched.php	Thu Aug  9 09:34:24 2007
@@ -90,7 +90,7 @@
   
   //print $command_output;
   
-  if (!file_exists($job->convfile)) {
+  if (!file_exists($job->convfile) || filesize($job->convfile) == 0) {
     watchdog('video_render', t('video conversion failed. ffmpeg reported the following output: ' . $command_output, WATCHDOG_ERROR));
   }
   else {