Convert HEVC to WMV — Free Online Tool
Convert HEVC/H.265 video files to WMV format using the Microsoft MPEG-4 v3 (msmpeg4) codec with WMA audio — entirely in your browser with no uploads required. This conversion trades H.265's superior compression efficiency for broad compatibility with legacy Windows Media Player and Windows-based workflows.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your HEVC file here
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Free — no uploads, no signups. Your files never leave your browser.
Settings
Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
HEVC (H.265) is a modern, computationally intensive codec that cannot be natively played by Windows Media Player or many older Windows applications. Converting to WMV requires a full re-encode of the video stream: the H.265-compressed frames are decoded and then re-encoded using Microsoft's MPEG-4 v3 codec (msmpeg4), which is the codec Windows historically associated with the .wmv extension. The audio track is simultaneously transcoded to WMA v2 (wmav2). Both the video and audio are wrapped in an ASF (Advanced Systems Format) container — the underlying container that WMV files use. Because msmpeg4 is a significantly older and less efficient codec than libx265, expect noticeably larger file sizes at equivalent quality, and some quality loss is inherent since both the source and output are lossy formats.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary — the open-source multimedia processing engine that powers this conversion both in the browser (via FFmpeg.wasm) and on the desktop. |
-i input.hevc
|
Specifies the input file, an HEVC/H.265 encoded video. FFmpeg will decode the H.265 video stream and any associated audio stream from this file as the source for re-encoding. |
-c:v msmpeg4
|
Sets the video encoder to Microsoft MPEG-4 Version 3 (msmpeg4), the proprietary codec that Windows Media Player natively decodes and the codec most strongly associated with the .wmv file format. |
-c:a wmav2
|
Sets the audio encoder to Windows Media Audio v2 (wmav2), Microsoft's standard lossy audio codec for the ASF/WMV container, ensuring audio playback compatibility with Windows Media Player. |
-b:v 2000k
|
Sets the target video bitrate to 2000 kilobits per second for the msmpeg4 encoder. Because msmpeg4 is far less efficient than the source HEVC codec, this bitrate is suitable for standard-definition content; HD content may require 4000k or higher for acceptable quality. |
-b:a 128k
|
Sets the WMA v2 audio output bitrate to 128 kilobits per second, a standard quality level for stereo audio that balances file size and audio fidelity in Windows Media contexts. |
-f asf
|
Explicitly forces the output container to ASF (Advanced Systems Format), which is the underlying container format for all WMV files. This ensures correct container structure regardless of how FFmpeg interprets the output filename. |
output.wmv
|
Defines the output filename with the .wmv extension, signaling to both FFmpeg and the end user that this is a Windows Media Video file encoded with the msmpeg4 video and wmav2 audio codecs inside an ASF container. |
Common Use Cases
- Preparing H.265 footage for playback in legacy enterprise or government environments that mandate Windows Media Player and cannot install third-party codecs
- Delivering video content to Windows XP or Windows Vista machines that have no H.265 decoder support and cannot run modern media players
- Converting HEVC drone or camera footage into a WMV format accepted by older Windows-based video editing or presentation software like early versions of Windows Movie Maker
- Packaging video content for distribution via internal corporate intranets or portals that were built around Windows Media streaming infrastructure
- Converting H.265 clips to WMV for use in legacy PowerPoint presentations on older Windows systems where HEVC playback is unavailable
- Archiving or delivering HEVC content to clients or partners whose IT-locked Windows workstations only permit Windows Media Player for video playback
Frequently Asked Questions
Yes, some quality loss is unavoidable. Your source HEVC file is already lossy-compressed, and re-encoding it with the msmpeg4 codec introduces a second generation of compression artifacts. The msmpeg4 codec is also considerably less efficient than H.265, meaning it produces more visible quality degradation at the same bitrate. The default output bitrate of 2000k is adequate for standard-definition or low-motion content, but for high-resolution or high-motion HEVC footage you should increase the -b:v value to 4000k or higher.
H.265 is one of the most compression-efficient video codecs ever standardized, often achieving similar quality to older codecs at half the bitrate. Microsoft's msmpeg4 codec used in WMV is far less efficient — it's rooted in MPEG-4 Part 2 technology from the early 2000s. Converting from HEVC to WMV at a fixed bitrate like 2000k means the msmpeg4 encoder needs more bits to represent the same visual information, resulting in larger files for comparable quality. If file size is critical, lowering the -b:v value will help, but at the cost of further quality reduction.
No. While HEVC has robust support for HDR (including HDR10 and Dolby Vision) and resolutions up to 8K, the msmpeg4 codec used in WMV has no HDR support and was designed for standard-definition and low-to-medium resolution video. If your source HEVC file contains HDR metadata or 4K resolution content, that information will be lost or downgraded during conversion. WMV is strictly a legacy SD/HD format and is not suitable for modern high-dynamic-range or ultra-high-definition workflows.
No. The ASF/WMV container and this conversion pipeline do not support subtitle streams or chapter markers, so any embedded subtitles or chapter data in the source will be discarded. While ASF technically supports multiple audio tracks, this tool outputs a single WMA audio track. If your HEVC file has multiple audio streams, only the default stream will be included in the WMV output.
To increase video quality, raise the -b:v value — for example, replace '2000k' with '4000k' or '6000k' for higher-fidelity output, especially useful for HD content. To improve audio quality, change the -b:a value from '128k' to '192k' or '256k'. For batch converting multiple HEVC files to WMV on your desktop, you can use a shell loop such as: for f in *.hevc; do ffmpeg -i "$f" -c:v msmpeg4 -c:a wmav2 -b:v 2000k -b:a 128k -f asf "${f%.hevc}.wmv"; done on Linux/macOS, or a comparable for loop in Windows PowerShell.
WMV is not a distinct container format — it is the Advanced Systems Format (ASF) container with a .wmv file extension. FFmpeg uses 'asf' as the internal format identifier for this container. Without the explicit '-f asf' flag, FFmpeg infers the output format from the file extension, which usually works correctly, but including it explicitly ensures the correct container is written regardless of how the output filename is specified. The msmpeg4 video codec and wmav2 audio codec are both native to the ASF container.
Technical Notes
This conversion involves a full transcode of both the video and audio streams — there is no stream copying possible because HEVC and msmpeg4 are entirely incompatible codecs. The msmpeg4 codec (specifically Microsoft MPEG-4 Version 3) is a proprietary variant of MPEG-4 Part 2 that is not standards-compliant and was designed to be decoded natively by Windows Media Player. It is distinct from the open MPEG-4 ASP codec (libxvid or mpeg4 in FFmpeg) and is specifically chosen here for maximum WMV compatibility. The WMA v2 (wmav2) audio codec is a mature, widely-supported lossy audio codec well-suited to the ASF container. One notable limitation: msmpeg4 in FFmpeg has limited support for high resolutions — performance and compatibility are best at 1080p and below. Transparency is not supported in either format. No metadata fields (title, artist, creation date) from the HEVC source are guaranteed to carry over into the ASF container, as metadata mapping between these formats is inconsistent. If you need to process HEVC files larger than 1GB, copy the displayed FFmpeg command and run it locally — FFmpeg handles arbitrarily large files without memory constraints.