Convert WMV to FLV — Free Online Converter
Convert Windows Media Video (.wmv) to Flash Video (.flv) online for free. Fast, secure video conversion with no watermarks or registration....
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Hur man konverterar
Upload your .wmv file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .flv file when it's ready.
About WMV to FLV Conversion
WMV was Microsoft's streaming video format for Windows Media Services and Silverlight, while FLV (Flash Video) was Adobe's answer for web-based video streaming. Both are legacy streaming formats from the 2000–2015 era. FLV carried either Sorenson Spark (H.263), VP6, or H.264 video with MP3 or AAC audio, and powered YouTube, Hulu, and nearly every video-hosting site before the HTML5 migration. Converting WMV to FLV repackages Microsoft's content for Adobe's legacy ecosystem — still relevant for certain CMS platforms and Chinese video infrastructure.
Why Convert WMV to FLV?
Some legacy content management systems, e-learning platforms, and video hosting solutions built during the Flash era still require FLV input. Bilibili, Youku, and other Chinese platforms have significant FLV archives. If you are maintaining or migrating a Flash-based video system and your source content is in WMV format, converting to FLV produces compatible output without rebuilding the delivery infrastructure.
Common Use Cases
- Migrating WMV corporate video libraries to FLV for legacy Flash-based e-learning platforms
- Converting WMV recordings for upload to legacy CMS systems that only accept FLV
- Preparing WMV content for legacy Red5 or Adobe Flash Media Server deployments
- Creating FLV versions of WMV marketing videos for archived Flash-based websites
- Converting WMV video for delivery through legacy CDN workflows configured for FLV
How It Works
FFmpeg decodes the VC-1/WMV2 video and WMA audio from the ASF container, then re-encodes video to H.264 (or Sorenson Spark for maximum Flash Player compatibility) and audio to AAC or MP3. The output is wrapped in the FLV container with onMetaData tags for duration, resolution, and seeking metadata. H.264 inside FLV supports up to 1080p, though most legacy systems expect 480p or 720p.
Quality & Performance
H.264 in FLV provides the same quality as H.264 in MP4 — the container does not affect the codec. At typical web bitrates (1–5 Mbps), the result looks clean. Using Sorenson Spark codec for older Flash Player versions produces significantly lower quality, typical of early-2000s web video.
Device Compatibility
| Device | WMV | FLV |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use H.264 inside FLV for the best quality — Sorenson Spark is only needed for Flash Player 7 or earlier compatibility.
- 2Include onMetaData at the file start with -flvflags add_keyframe_index for proper seeking in JavaScript-based FLV players.
- 3Consider converting to MP4 instead if your legacy system can be updated — it is a one-time migration that eliminates FLV dependencies.
- 4Set keyframe interval to 2 seconds for smooth seeking in streaming scenarios.
Related Conversions
WMV to FLV conversion bridges two legacy ecosystems — Microsoft's streaming platform and Adobe's Flash ecosystem. While both are outdated, the conversion remains necessary for maintaining existing infrastructure.