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Convert Windows Media Video WMV files to FLV for Flash-based video platforms, RTMP streaming workflows, and legacy browser video players. ChangeThisFile uses FFmpeg on secure servers for private, fast conversion.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts WMV to FLV using FFmpeg, a professional-grade multimedia framework, to transcode WMV files to FLV format with optimized codec settings and quality preservation. Free with no signup required. Files are encrypted during transfer and automatically deleted from our servers after conversion.
WMV vs FLV: Format Comparison
Key differences between the two formats
| Feature | WMV | FLV |
|---|---|---|
| Full Name | Windows Media Video | Flash Video |
| Developer | Microsoft | Adobe Systems |
| Container | ASF (Advanced Systems Format) | Flash Video Container |
| Video Codec | WMV9 / VC-1 | H.263, VP6, H.264 |
| Audio Codec | WMA, WMA Pro | MP3, AAC, Nellymoser |
| Platform | Windows | Flash Player (deprecated) |
| Streaming Protocol | Windows Media Services, MMS | RTMP |
| Web Delivery | Requires Windows codec | Flash Player required (deprecated) |
When to Convert
Common scenarios where this conversion is useful
Feeding a system that still requires FLV
If an older CMS, LMS, or RTMP server only accepts FLV uploads, convert your WMV file to satisfy that requirement. For anything modern, MP4 is the better target.
Matching an existing Flash-era archive
When a video library is already stored as FLV from the Flash era, convert new WMV files to FLV so the collection stays in one format. New archives should use MP4.
Older offline or embedded players
Some legacy desktop, kiosk, or embedded players were built around FLV and cannot read modern formats. Convert WMV to FLV only when you cannot update the player itself.
Who Uses This Conversion
Tailored guidance for different workflows
Content Creators
- Convert WMV footage to FLV for playback in software and devices that expect the FLV format
- Transform WMV recordings to FLV to match the format an existing workflow or player requires
Video Editors
- Convert WMV footage to FLV for importing into editing software like Premiere or DaVinci Resolve
- Transform WMV project exports to FLV for client delivery or final distribution
Social Media Managers
- Convert WMV videos to FLV for compatibility with legacy players or archival systems that use FLV
- Transform WMV source files to FLV when a specific tool only accepts FLV input
How to Convert WMV to FLV
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1
Upload Your WMV File
Click to select or drag your Windows Media Video WMV into the converter. All uploads use HTTPS encryption for secure transmission.
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2
Server-Side FFmpeg Conversion
FFmpeg transcodes the VC-1 video from your WMV to H.264 in an FLV container with AAC audio for Flash-compatible playback.
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3
Download Your FLV File
Your FLV file is ready to download when conversion finishes. The original WMV is permanently and automatically deleted from our servers.
Developers: convert via API →
Frequently Asked Questions
FLV is required for legacy Flash-based video platforms, RTMP streaming servers, and older embedded video players. While Flash is deprecated, some archival and enterprise systems still require FLV input.
Yes. VLC, MPC-HC, and other modern media players support FLV playback without Adobe Flash Player, which was officially discontinued in 2020.
The FLV output uses H.264 video encoding with AAC audio, providing the best compatibility with Flash players and the highest quality for the format.
DRM-protected WMV files cannot be converted. This tool supports only unprotected WMV files.
Files up to 25MB (free tier; 100MB with eligible paid browser access) are supported. Trim larger WMV files before uploading.
Yes. Files are uploaded with HTTPS encryption and automatically deleted from our servers after your download completes. No data is retained.
Most WMV to FLV conversions complete in 30-90 seconds depending on file size.
Yes. FFmpeg preserves the source resolution and frame rate from your WMV in the FLV output.
WMA audio is re-encoded as AAC in the FLV output, which may introduce minor quality changes. FFmpeg uses high-quality settings to minimize this.
Yes. Completely free with no accounts, no subscriptions, and no watermarks.
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Use the ChangeThisFile API to convert WMV to FLV in your app or script. Free tier included.
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