Convert FLV to WebM Online

About FLV (source)

FLV (Flash Video) was the standard for web video before HTML5. Flash Player is discontinued, so FLV files no longer play in browsers. FLV typically contains H.264 or VP6 with MP3 or AAC audio and survives mainly in old downloads.

Where FLV shows up:

• Recovered Flash-era website downloads
• Legacy streaming server archives
• Old live stream recordings
• Historical web media preservation

About WebM (target)

WebM is a web-focused container designed for HTML5 video. It usually holds VP8 or VP9 video with Opus or Vorbis audio. Chrome, Firefox, and Edge play WebM natively; Safari support improved in recent versions. Screen recorders and web apps often export WebM.

Where WebM is used:

• HTML5 <video> players on websites
• Chrome and OBS screen recordings
• Discord and web app exports
• Open, royalty-free web delivery

Converting FLV to WebM

Pros

• Often smaller than FLV at similar quality for web use
• Royalty-free and native in Chrome and Firefox

Cons

• Weaker support on Apple devices and older TVs
• Requires transcoding from most FLV sources

Caveats

• WebM output typically uses VP9 and Opus for efficient web delivery. Safari and older smart TVs may need an MP4 fallback alongside WebM.
• FLV sources may use obsolete codecs or odd frame sizes. Verify aspect ratio after conversion - legacy pixel aspect ratios can look stretched.
• Muxara maps the primary video and audio streams. Extra subtitle or audio tracks may not carry over unless you choose subtitle handling in the converter settings.
• Uploads are processed on dedicated workers and deleted within 24 hours. For offline batch work, use the free Muxara Mac app.