reason ：

1. Use the oil monkey plug-in to download B Station or YouTube Video for flv Format cannot be played locally
2. Use the downloaded video transcoder for more than 100M charge
3. Use edge Plug in video transcoder exceeds 100M charge

resolvent ：

by Windows Media Player install FLV Video codec

Go straight to Windows Media Player Play on FLV video , You can simply use FLV Codec Pack , for example K-Lite Codec Pack .
It is a comprehensive choice of codecs , Can be directly in Windows Media Player Play almost all video or audio files on .

Download link K-Lite Codec Pack . Make sure it is a secure file you downloaded . After downloading the codec , You can install it on your computer .

Step after successfully installing the codec package , You can start Windows Media Player And open accordingly FLV video . It will play automatically FLV.

problem ：

This is installed by default C You can't change it on the disk , Did not convert the video into Mp4 Format