Fix/repair flv files (make flv files seekable,playable,inject metadata,fix duration)

Sometimes when you download/capture flash video .FLV files with a Flash stream recorder, it turns out that they are corrupted (flv video plays too fast, flv video is not seekable, flv video is not playble, flv video stops after a few seconds).

How to fix FLV files: Re-download the video

The common way to fix this problem is to re-download the video using the same Flash stream recorder or another one that handles FLV files better.