Discover negative timestamps then transcode with -ss option to FFMPEG

[BryonLewis]

Videos sometimes have negative frame timestamps. The initial check of the video should determine if there are negative timestamps. If they exist it should then force a transcode using -ss 0 to seek to the true start time of the video.

This is all a result of the web not knowing the existing of negative time stamps so the first -0.2 timestamp is seen as positive time in the video.