MyMediaTools

Convert 3GP to WMV — Free Online Tool

Convert 3GP mobile video files to WMV format using the msmpeg4 video codec and wmav2 audio codec, re-encoding the low-bandwidth mobile stream into a Windows Media-compatible format suitable for desktop playback and Windows Media Player. This tool runs entirely in your browser — no uploads, no waiting.

FFmpeg Command

Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg

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Estimated output:

Conversion Complete!

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How It Works

3GP files typically contain H.264 (libx264) video and AAC audio encoded at low bitrates for mobile networks and small screen sizes. Converting to WMV requires a full re-encode: the video stream is decoded from H.264 and re-encoded using the msmpeg4 codec (Microsoft MPEG-4 Version 3), while the AAC audio track is transcoded to wmav2 (Windows Media Audio v2). The output is wrapped in an ASF (Advanced Systems Format) container — the underlying structure of WMV files — using the -f asf flag. Because both formats are lossy, this is a lossy-to-lossy transcode, meaning some generation loss is unavoidable. The video bitrate increases significantly from the typical 3GP mobile bitrate to 2000k, which recovers perceived quality even though the original compressed data cannot be restored.

What Each Flag Does

Flag What it does
ffmpeg Invokes the FFmpeg program, which is running here as a WebAssembly (FFmpeg.wasm) build compiled for in-browser use — no files leave your machine.
-i input.3gp Specifies the input file, a 3GP container typically holding H.264 video and AAC audio encoded at low bitrates for mobile delivery.
-c:v msmpeg4 Sets the video codec to Microsoft MPEG-4 Version 3, the native video codec for WMV/ASF files and the format expected by Windows Media Player for broad compatibility.
-c:a wmav2 Transcodes the 3GP's AAC audio track to Windows Media Audio version 2, which is required because the ASF container used by WMV does not natively carry AAC in a Windows Media Player-compatible way.
-b:v 2000k Sets the video bitrate to 2000 kilobits per second for the msmpeg4 encode — significantly higher than the typical 3GP mobile bitrate — to produce a WMV suitable for desktop viewing rather than constrained mobile bandwidth.
-b:a 128k Sets the wmav2 audio output bitrate to 128k, doubling the typical 64k audio bitrate from 3GP sources to provide cleaner audio in the Windows Media playback context.
-f asf Forces the output container format to ASF (Advanced Systems Format), the underlying container structure of all WMV files — this ensures FFmpeg correctly writes the WMV-compatible bitstream regardless of the output filename.
output.wmv The filename of the resulting WMV file, wrapped in an ASF container with msmpeg4 video and wmav2 audio, ready for playback in Windows Media Player or other Windows-compatible media applications.

Common Use Cases

  • Playing old mobile phone video clips recorded in 3GP on a Windows PC where Windows Media Player is the default or only available media application
  • Uploading mobile-recorded 3GP footage to a Windows-based media server or corporate intranet that only accepts WMV or ASF-format video
  • Repurposing legacy 3G-era video content for use in Windows Movie Maker or older Microsoft video editing pipelines that require WMV-compatible input
  • Archiving or sharing 3GP clips with non-technical Windows users who have no media player capable of handling the 3GP container
  • Preparing mobile video content for streaming through Windows Media Services or IIS Smooth Streaming infrastructure that expects ASF-based formats

Frequently Asked Questions

3GP files are specifically designed for 3G mobile networks, so their video is typically encoded at very low bitrates — often under 300k — to minimize file size and transmission cost. This tool re-encodes the video at a default bitrate of 2000k for WMV, which is a more standard desktop viewing bitrate. The audio also increases from 64k AAC to 128k wmav2. The size increase reflects the higher bitrate targets of the WMV format, not added quality from the original compressed mobile source.
Not necessarily, and this is an important distinction. The original 3GP was encoded at low resolution and low bitrate for mobile delivery — that quality ceiling is baked into the source. Re-encoding at a higher WMV bitrate can reduce compression artifacts introduced during the WMV encode itself, but it cannot recover detail that was discarded when the 3GP was originally created. You may notice slightly smoother playback but the underlying resolution and sharpness of the original mobile capture remain unchanged.
Yes. The msmpeg4 codec used here is Microsoft MPEG-4 Version 3, which is natively supported by Windows Media Player and the broader Windows Media ecosystem. It is one of the two video codecs supported within the ASF/WMV container format and was widely used in early Windows Media workflows. Modern versions of Windows Media Player on Windows 7, 8, 10, and 11 will play back this output without requiring additional codec packs.
The AAC audio track in the 3GP is fully transcoded — decoded and re-encoded — into wmav2 (Windows Media Audio version 2) at 128k. AAC cannot be carried natively in an ASF container in a WMV-compatible way without re-encoding, so this transcode is necessary. wmav2 at 128k is a reasonable quality level for speech and general audio from mobile video, though the source AAC was likely encoded at 64k, meaning the original audio fidelity was already limited before this step.
Replace the value after -b:v in the command with your desired bitrate. For example, use -b:v 1000k for a smaller file that is still acceptable for low-motion mobile footage, or -b:v 4000k if you want to reduce visible compression artifacts on footage with more motion or detail. Keep in mind that the original 3GP source quality places a ceiling on how much visual improvement higher bitrates can provide, so going above 4000k offers diminishing returns for typical mobile-captured content.
Yes, you can adapt the command for batch processing in a terminal. On Linux or macOS, use a shell loop: 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". This browser-based tool processes one file at a time, so the local FFmpeg command is especially useful when converting a folder of legacy mobile clips.

Technical Notes

The 3GP-to-WMV conversion involves two distinct codec families with no shared stream components, making a full re-encode of both video and audio mandatory. The video path goes from H.264 (as stored in 3GP) through the msmpeg4 encoder, which implements a variant of MPEG-4 Part 2 developed by Microsoft before the standardization of more modern codecs. This codec is not the same as MPEG-4 ASP and is not interchangeable with libxvid or other MPEG-4 Part 2 implementations — it is specifically tied to the ASF container and Windows Media ecosystem. The -f asf flag is required because FFmpeg identifies WMV output by its container format rather than the file extension alone, ensuring the bitstream is correctly wrapped in the Advanced Systems Format structure. Neither 3GP nor WMV supports subtitles, transparency, or chapter markers, so no metadata of those types will be lost in this conversion. Standard metadata tags such as title and creation date may or may not survive the transcode depending on what the original 3GP file contains, as ASF has its own metadata schema. One notable limitation: 3GP files from very early mobile devices sometimes use AMR audio rather than AAC; if your 3GP contains AMR audio, FFmpeg will still handle the transcode to wmav2, but the audio quality floor will be lower than AAC-sourced files due to AMR's narrowband telephony-grade encoding.

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