Try converting the file first. Many converters are avaiable online. Assure that it can take FLV (Flash based files) and export as MPEG (or DVD standard) to maximize compatibility.
Found this in a search quickly:AVS Video Converter
is an all-in-one multimedia program for capturing, converting, editing,
converting, transferring, burning DVD and movie files. It can convert
FLV files to DVD, burn FLV to DVD, as well as convert FLV to all
popular video file formats, and even extract MP3/WAV audio from FLV.
Supports Youtube, Flash, Google FLV video files.