Root Video Problems after rooting

[roshan2004]

I have recently rooted my Galaxy y with 8 GB Memory card. Everything seemed to work fine until now. I have downloaded some videos from youtube downloader and Advanced download manager via my phone. However, some videos are not working. Even the mx player treats them like audio files and some disturbing sounds come through them when I play it. Even when I played them at my PC, the videos are not playing at all. What might be the problem ? Is it due to rooting or some defects in applications or any other else...............

 

[Metroid Prime]

Moved to All Things Root section as this might be root related.

 

[roshan2004]

The problem doesnot seem to be stopping as the videos that used to be played seemlessly in MX Player are not playing anymore- it is still being played as an audio file with nagging and creepy sound coming through. Help anyone :-(