Convert video From flv to webm

An FLV file is a video file saved in the Adobe Flash Video (FLV) container format. It stores a short header, synchronized audio and video data streams (encoded the same way as streams in the standard Flash .SWF format), and metadata packets. Information from <a href='https://fileinfo.com'>FileInfo - The File Extensions Database</a>.

WebM is an open, royalty-free, media file format designed for the web. WebM defines the file container structure, video and audio formats. WebM files consist of video streams compressed with the VP8 or VP9 video codecs and audio streams compressed with the Vorbis or Opus audio codecs.