Repairing an MP4 file

[NOMORECOCKTAILS]

I have a few MP4 files that are conversions of mpg files which in turn were captured video. The converted MP4 files dont play in VLC. So i have been googling repair mp4 and i found HD Video Repair which sort of repaired on of the files - at least i could hear the audio but the video was unrecognizable. Is there any way to fix these mp4 files? Or can anyone create a new header for the files?
Is the fact that the video is viewable after a run through with HD Video Repair because of the trial limitation?

[aedipuss]

Start over and recreate them. Far easier.

[NOMORECOCKTAILS]

Not possible. I deleted the mpgs and only later realized the mp4 files were no viewable.

[FireRouteR]

Hello NOMORECOCKTAILS,

You could try to preview them using MP4repair.org. In case preview is fine then you could repair them. If not simply try to re-capture them again as suggested.

Regards,
Fire

[Baldrick]

Try also Video Repair tool. Try the trial first.