As promised, I have just finished updating the paid-for version of my software. New in this version:
1) Fixed a bug in which errors could possibly occur when two users simultaneously convert the same YouTube or Dailymotion video. This has been addressed with an additional constant "_ENABLE_CONCURRENCY_CONTROL" in the config class, which toggles this feature on and off. The code to change is in VideoConverter.class.php and config.class.php.
2) New concurrency control feature also prevents similar errors from occurring during ringtone creation
3) You can now prohibit conversions of videos that are longer than X number of seconds. This setting can be configured differently for each converted file type in the config class.
4) Expanded schedule.php (script that runs as daily task on server) so that it also deletes temporary video files and log files that were not automatically deleted due to conversion abandonment
All previous customers who have purchased the paid-for version of my app are receiving this new, updated version via the e-mail addresses that you provided at Tradebit.com.
Please report any issues with either the paid-for version or the free version in this forum thread.