What is WMV and when should I use it?

WMV (Windows Media Video) is Microsoft's proprietary video format built around the VC-1 (formerly WMV9) codec. It is natively supported by Windows Media Player, Windows Movie Maker, and many corporate video-management systems. Use WMV when a downstream platform explicitly requires it, or when distributing video to Windows users who cannot install additional codecs. For general-purpose video, MP4 (H.264) is a better choice because it has universal cross-platform support.

What FFmpeg codec should I use for WMV output?

FFmpeg's wmv2 encoder produces WMV 8-compatible output, and wmv1 produces the older WMV 7 format. For the most compatible WMV files, use -c:v wmv2 -c:a wmav2. If your target system requires WMV 9 / VC-1, use -c:v libvc1 if it is built into your FFmpeg, otherwise wmv2 is the safest cross-compatible choice. Pair with the wmav2 audio codec and a bitrate matching or slightly above the source FLV.

Will converting FLV to WMV reduce quality?

Yes — FLV uses Sorenson Spark (H.263), On2 VP6, or H.264 video, none of which can be losslessly remuxed into WMV. Full re-encoding to VC-1/WMV2 is always required, which introduces some generation loss. Keep the video bitrate at or above the source (check with ffprobe) to minimize visible degradation. A bitrate of 2000–4000 kb/s is adequate for 720p FLV content.

Can HandBrake output WMV files?

HandBrake does not natively support WMV output — its container choices are MP4 and MKV. If you need a GUI workflow for WMV, use VLC's Media > Convert/Save feature, which supports WMV output directly. Alternatively, use HandBrake to produce a high-quality MP4 intermediate, then run a second FFmpeg pass to convert MP4 to WMV.

Is my video file uploaded anywhere?

No. The file inspector uses the browser's File API and URL.createObjectURL(). Your video file never leaves your device — there is no upload, no server processing, and no tracking of any kind.

How do I batch-convert multiple FLV files to WMV?

On Windows use a PowerShell loop: Get-ChildItem *.flv | ForEach-Object { ffmpeg -i $_.FullName -c:v wmv2 -b:v 2000k -c:a wmav2 -b:a 128k ($_.BaseName + ".wmv") }. On Mac/Linux use a bash loop: for f in *.flv; do ffmpeg -i "$f" -c:v wmv2 -b:v 2000k -c:a wmav2 -b:a 128k "${f%.flv}.wmv"; done. Adjust the video bitrate (-b:v) to match the quality needs of your source files.

My WMV file has no audio after conversion — how do I fix it?

Some FLV files use ADPCM or Nellymoser audio that FFmpeg may not detect automatically. Force the wmav2 audio codec explicitly: ffmpeg -i input.flv -c:v wmv2 -b:v 2000k -c:a wmav2 -b:a 128k output.wmv. If audio is still missing, verify the FLV has an audio stream first: ffprobe -v quiet -show_streams input.flv. Look for stream entries with codec_type=audio.

Why is WMV less common than MP4 today?

WMV is a proprietary Microsoft format with limited support outside of Windows. It does not play natively on iOS, Android, macOS, or most smart TVs without additional codecs. MP4 with H.264 has displaced WMV as the universal standard for streaming, social media, and cross-platform distribution. Only use WMV when a specific system or workflow explicitly requires it.

FLV to WMV Converter

Name: FLV to WMV Converter
Availability: InStock
Author: Nham Vu

Step-by-step guide for converting FLV video files to WMV format using FFmpeg, HandBrake, and VLC, plus a client-side FLV file metadata inspector.

Video File Inspector

Select any video file to read its metadata instantly — 100% client-side, nothing uploaded.

Click to choose a video file FLV, WMV, MP4, AVI, MOV…

FLV vs. WMV — Format Comparison

Know what you are converting and why

Feature	FLV	WMV
Developer	Adobe (Macromedia, 2002)	Microsoft (2000)
Common codecs	Sorenson Spark, On2 VP6, H.264	WMV7, WMV8 (wmv2), VC-1 (WMV9)
Browser support	None (Flash ended 2020)	None without plugin
Windows playback	Needs VLC or codec pack	Native — Windows Media Player
Mobile support	Not supported	Limited (needs VLC on mobile)
Best for	Legacy web video archives	Windows-only workflows, legacy corporate systems

FFmpeg (Recommended — full codec control)

Free, cross-platform, most flexible

FFmpeg handles all FLV input variants and can output WMV files using the wmv2 video encoder and wmav2 audio encoder. Set the video bitrate to match or exceed your source FLV for the best quality result.

# Install on Mac via Homebrew
brew install ffmpeg

# Install on Windows via winget
winget install ffmpeg

# Check FLV source bitrate and codec before converting
ffprobe -v quiet -show_streams input.flv

# Standard FLV to WMV conversion (WMV2 codec)
ffmpeg -i input.flv -c:v wmv2 -b:v 2000k -c:a wmav2 -b:a 128k output.wmv

# Higher quality — match bitrate to source if source is above 2000k
ffmpeg -i input.flv -c:v wmv2 -b:v 4000k -c:a wmav2 -b:a 192k output.wmv

# Batch convert all FLV files in current folder (Linux / Mac)
for f in *.flv; do ffmpeg -i "$f" -c:v wmv2 -b:v 2000k -c:a wmav2 -b:a 128k "${f%.flv}.wmv"; done

Use -b:v 2000k for 720p content and -b:v 4000k for 1080p. WMV does not support CRF-based quality control — only bitrate-based encoding.

VLC Media Player (GUI — WMV output supported)

Free, Windows / Mac / Linux

Open VLC and go to Media → Convert / Save.
Click Add, select your FLV file, then click Convert / Save.
Click the Edit selected profile wrench icon next to the Profile drop-down.
In the Encapsulation tab, select ASF/WMV.
In the Video codec tab, choose WMV2 and set a bitrate (e.g., 2000 kb/s for 720p FLV).
In the Audio codec tab, choose WMA2 at 128 kbps or higher.
Set the destination file with a .wmv extension and click Start.

VLC re-encodes the FLV and writes the WMV file to your chosen destination path. VLC supports WMV output natively, unlike HandBrake.

HandBrake — Two-Step Workaround

HandBrake does not output WMV natively

HandBrake only outputs MP4 and MKV containers. It cannot produce WMV files directly. If you prefer a GUI workflow, use VLC instead. If you want HandBrake's encoding quality presets, use this two-step process:

Use HandBrake to convert FLV to a high-quality MP4 (H.264, RF 18, AAC 192k).
Run a second pass with FFmpeg to convert the MP4 to WMV:
ffmpeg -i intermediate.mp4 -c:v wmv2 -b:v 3000k -c:a wmav2 -b:a 128k output.wmv

The two-step approach gives you HandBrake's deinterlacing and scaling presets while still producing WMV output.

Summary