Convert 3GPP to WMV — Free Online Tool
Convert 3GPP mobile video files to WMV format using the msmpeg4 video codec and wmav2 audio codec — entirely in your browser with no uploads required. This tool is ideal for bringing legacy mobile recordings into Windows Media Player-compatible environments without needing desktop software.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your 3GPP file here
or click to browse
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
3GPP files typically contain H.264 (libx264) video and AAC audio optimized for mobile transmission at low bitrates. Converting to WMV requires full re-encoding of both streams: the video is transcoded from H.264 into the MPEG-4 Part 2 Microsoft variant (msmpeg4), and the audio is transcoded from AAC into WMA v2 (wmav2). Because neither codec is stream-compatible with the other, every frame of video and every audio sample must be decoded and re-encoded from scratch. The output is wrapped in an ASF (Advanced Systems Format) container — the underlying container that WMV files use — using the -f asf flag. The default video bitrate is set to 2000k, which is substantially higher than the low-bitrate 3GPP source, so the encoder will upsample quality to fill that target, though no new detail can be recovered from the compressed source.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program, which is the open-source multimedia processing engine running under the hood — in the browser via WebAssembly (FFmpeg.wasm), or locally on your desktop if you run this command yourself. |
-i input.3gp
|
Specifies the input file — a 3GPP container (typically containing H.264 video and AAC audio) as recorded by a mobile device or designed for 3G network delivery. |
-c:v msmpeg4
|
Sets the video codec to msmpeg4, Microsoft's proprietary MPEG-4 Part 2 variant, which is the standard video codec for WMV files and is natively supported by Windows Media Player without additional software. |
-c:a wmav2
|
Sets the audio codec to Windows Media Audio version 2 (wmav2), transcoding the 3GPP source's AAC audio into Microsoft's proprietary lossy audio format required for standard WMV compatibility. |
-b:v 2000k
|
Targets a video bitrate of 2000 kilobits per second for the msmpeg4 output — substantially higher than a typical 3GPP mobile source bitrate, resulting in a larger file that represents the source material at a desktop-quality data rate. |
-b:a 128k
|
Targets an audio bitrate of 128 kilobits per second for the wmav2 stream, providing a standard quality audio output that balances file size and fidelity for Windows Media Player playback. |
-f asf
|
Forces the output container format to ASF (Advanced Systems Format), which is the underlying Microsoft container format that WMV files use — ensuring the output is a properly structured WMV-compatible file rather than relying solely on the .wmv file extension for format detection. |
output.wmv
|
The name of the output file. The .wmv extension signals to Windows systems that this is a Windows Media Video file, enabling automatic association with Windows Media Player and correct thumbnail generation in Windows Explorer. |
Common Use Cases
- Preparing old mobile phone recordings (shot in 3GPP format on early 3G-era handsets) for playback in corporate Windows environments where Windows Media Player is the standard media application.
- Submitting video content to legacy enterprise or government systems that accept only WMV or ASF-wrapped files and cannot handle 3GPP input.
- Archiving mobile video clips from older Nokia, Sony Ericsson, or early Android devices into a Windows-native format for long-term storage on Windows file servers.
- Editing 3GPP footage in older versions of Windows Movie Maker or other Windows-native editors that recognize WMV/ASF containers but not 3GPP.
- Converting low-resolution 3GPP mobile clips to WMV for embedding in legacy Microsoft PowerPoint presentations that use Windows Media Player as the embedded video renderer.
- Sending mobile video recordings to clients or colleagues who are on Windows-only workflows and have no codec pack or player capable of handling 3GPP files.
Frequently Asked Questions
No — converting 3GPP to WMV will not recover quality that was lost when the original mobile video was recorded. 3GPP files are compressed with lossy codecs (H.264 video and AAC audio), and that compression is irreversible. Re-encoding into msmpeg4 and wmav2 at higher bitrates simply means the WMV encoder has more 'room' to represent the already-compressed signal, but it cannot reconstruct details that no longer exist in the source. In some cases, the re-encoding step may introduce slight additional quality degradation.
3GPP files are intentionally small because they were designed for 3G mobile networks where bandwidth was extremely limited — often encoding at bitrates below 128k for video. The default WMV output uses a 2000k video bitrate and 128k audio bitrate, which are far higher than a typical 3GPP source. The larger file size does not mean better quality relative to the original; it reflects the higher bitrate target of the msmpeg4 encoder filling the output with what is essentially upscaled compressed data.
Most metadata embedded in 3GPP files — such as recording timestamps, device information, or GPS coordinates stored in moov atoms — will not be carried over into the WMV/ASF output. The ASF container uses a completely different metadata structure (ASF Content Description Objects) that has no direct mapping for mobile-specific 3GPP metadata fields. Basic tags like title may transfer if present, but location data and device-specific fields will be lost during this conversion.
Yes — WMV files encoded with msmpeg4 video and wmav2 audio are natively supported by Windows Media Player on all modern versions of Windows without requiring additional codec packs. The ASF container is a Microsoft-native format, so these files integrate well with Windows Explorer thumbnails and Windows Media Player libraries. However, playback on macOS or Linux may require a third-party player like VLC.
To adjust the video bitrate, change the value after -b:v — for example, use -b:v 1000k for a smaller file or -b:v 4000k for higher quality. To adjust the audio bitrate, change the value after -b:a — for example, -b:a 192k for better audio fidelity. Because the msmpeg4 codec uses constant bitrate (CBR) encoding via -b:v rather than a quality-based CRF scale, the bitrate value directly controls both file size and quality tradeoff in the output WMV.
Yes — on the desktop you can batch process using a shell loop. On Linux or macOS, run: for f in *.3gp; do ffmpeg -i "$f" -c:v msmpeg4 -c:a wmav2 -b:v 2000k -b:a 128k -f asf "${f%.3gp}.wmv"; done. On Windows Command Prompt, use: for %f in (*.3gp) do ffmpeg -i "%f" -c:v msmpeg4 -c:a wmav2 -b:v 2000k -b:a 128k -f asf "%~nf.wmv". The browser-based tool processes one file at a time, so the FFmpeg command is especially useful for bulk conversions of large collections of mobile video files.
Technical Notes
The msmpeg4 codec used in this conversion is Microsoft's proprietary MPEG-4 Part 2 variant — specifically the version sometimes labeled MS-MPEG4 v3 — which differs from standard ISO MPEG-4 Part 2 and is not interchangeable with H.264 or modern codecs. It predates H.264 and generally achieves lower compression efficiency at the same bitrate, meaning a WMV file at 2000k will not look as sharp as an MP4 at 2000k encoded with libx264. The wmav2 audio codec is Windows Media Audio version 2, a proprietary Microsoft lossy audio format that is functionally comparable to MP3 at equivalent bitrates but remains less common than AAC or Opus outside Windows ecosystems. The -f asf flag is required because FFmpeg's output format detection alone may not correctly identify the ASF container from the .wmv extension in all cases; forcing it ensures the container structure is valid. Subtitle and chapter data are not supported by either 3GPP in this tool's configuration or WMV, so no subtitle stream handling is needed. The 3GPP source's -movflags +faststart optimization (used for mobile streaming) has no equivalent in ASF and is not carried forward. If your 3GPP source contains multiple audio tracks, be aware that only the first (default) audio track will be encoded into the WMV output, as the 3GPP input configuration does not support multiple audio track selection.