Extract Audio from 3GP to WMA — Free Online Tool
Extract audio from 3GP mobile video files and convert it to WMA format using the wmav2 codec — ideal for bringing mobile-captured audio into Windows Media Player or legacy Microsoft ecosystems. The 3GP container's AAC audio stream is transcoded to Windows Media Audio directly in your browser, no upload required.
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FFmpeg Command
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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
3GP files store audio using AAC (the default codec for this mobile-optimized format), encoded at relatively low bitrates suited to 3G network constraints. During this conversion, FFmpeg discards the video stream entirely and transcodes the AAC audio into WMA using the wmav2 codec at 128kbps. Because AAC and WMA use incompatible compression schemes, a full audio decode-and-re-encode cycle occurs — the AAC audio is first decoded to raw PCM, then re-encoded as wmav2. This means there is a generation of quality loss, as you are transcoding between two lossy formats. The resulting .wma file is compatible with Windows Media Player, older Windows devices, and platforms that require Microsoft's audio format.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program, the open-source multimedia processing engine that handles all decoding, stream filtering, and re-encoding operations in this conversion pipeline. |
-i input.3gp
|
Specifies the input file — a 3GP container, which typically holds a video stream encoded with H.264 and an audio stream encoded with AAC at a low mobile-optimized bitrate. |
-vn
|
Disables video output entirely, instructing FFmpeg to ignore the H.264 video stream in the 3GP file. This is essential because WMA is an audio-only format and cannot carry video data. |
-c:a wmav2
|
Sets the audio encoder to wmav2 (Windows Media Audio v2), transcoding the 3GP file's AAC audio into Microsoft's proprietary WMA format, which is required for .wma output compatibility. |
-b:a 128k
|
Sets the WMA audio bitrate to 128 kilobits per second, a standard quality level for WMA that balances file size and audio fidelity — appropriate for music and voice content extracted from 3GP mobile recordings. |
output.wma
|
Defines the output filename with the .wma extension, which tells FFmpeg to wrap the wmav2-encoded audio in Microsoft's ASF (Advanced Systems Format) container — the standard packaging for WMA audio files. |
Common Use Cases
- Converting voice memos or calls recorded on an older 3G-era phone into WMA for archiving in a Windows Media Player library
- Preparing 3GP audio captured on a feature phone for playback on a Windows CE or Windows Mobile device that only supports WMA
- Extracting speech or narration from a 3GP mobile video to create a WMA audio file for use in a Windows-based e-learning or presentation system
- Stripping the audio track from a 3GP video recorded at a live event to share via a service or device that requires WMA format
- Converting 3GP audio content from legacy mobile archives into WMA as part of a digitization or migration workflow for corporate Windows environments
Frequently Asked Questions
Yes, some quality loss is inevitable because both AAC and WMA are lossy formats, and transcoding between them requires a full decode-and-re-encode cycle. The AAC audio in a typical 3GP file is already encoded at a low bitrate (often 64kbps or less), so feeding that decoded audio into wmav2 at 128kbps does not recover lost detail — it simply re-encodes what remains. For archival or critical listening purposes, if you have access to the original source audio, encoding directly to WMA from that source will always yield better results.
The '-vn' flag explicitly tells FFmpeg to ignore and discard all video streams from the 3GP input. WMA is a pure audio format and cannot contain video data, so including '-vn' prevents FFmpeg from attempting to map the video stream and potentially throwing an error. Without it, FFmpeg might warn about incompatible video streams or fail to write the output file correctly.
Replace '128k' in the '-b:a 128k' portion of the command with your desired bitrate. WMA (wmav2) supports bitrates from 64k up to 320k — for example, use '-b:a 192k' for better quality or '-b:a 64k' for a smaller file. Keep in mind that since the 3GP source audio is typically encoded at a low bitrate, raising the WMA bitrate significantly beyond the source quality will not recover lost detail and will only increase file size.
FFmpeg will attempt to copy compatible metadata tags from the 3GP container to the WMA output, but 3GP files recorded by mobile phones often contain minimal or no metadata at all. WMA supports a richer metadata tag scheme (including artist, album, title, and genre fields), so any tags that do exist in the 3GP source should transfer. If you need to embed specific metadata into the WMA file, you can add flags like '-metadata title="My Track"' to the FFmpeg command.
Yes, on the command line you can use a shell loop to process multiple files. On Linux or macOS, run: 'for f in *.3gp; do ffmpeg -i "$f" -vn -c:a wmav2 -b:a 128k "${f%.3gp}.wma"; done'. On Windows Command Prompt, use: 'for %f in (*.3gp) do ffmpeg -i "%f" -vn -c:a wmav2 -b:a 128k "%~nf.wma"'. The browser-based tool processes one file at a time, so the command-line approach is recommended for batch jobs.
Yes, by replacing '-c:a wmav2' with '-c:a wmav1' in the FFmpeg command you can target the original Windows Media Audio v1 codec. However, wmav2 is almost universally preferred — it delivers better audio quality at the same bitrate compared to wmav1, and it is supported by all devices and software that support wmav1. You would only choose wmav1 if you specifically need compatibility with a very old or restricted system that cannot decode wmav2.
Technical Notes
3GP files typically encode audio using AAC at bitrates between 32kbps and 128kbps, reflecting the format's design goals around 3G mobile bandwidth and limited device storage. The wmav2 codec used for the output is the second-generation Windows Media Audio codec, which Microsoft has used as the standard WMA implementation since Windows Media Player 7. At 128kbps, wmav2 produces reasonable fidelity for speech and moderate-complexity audio, though its compression efficiency is generally considered slightly inferior to AAC at equivalent bitrates — meaning a 128kbps WMA file may sound marginally worse than a 128kbps AAC file from the same source. WMA files support DRM (Digital Rights Management) embedding, though FFmpeg does not apply DRM by default. The .wma container is a subset of Microsoft's Advanced Systems Format (ASF), which also underpins .wmv files. One practical limitation: because 3GP's audio is often recorded at low sample rates (8kHz or 16kHz for voice calls), the WMA output will inherit those low sample rates unless you explicitly resample using '-ar 44100' or similar. This conversion does not support preserving chapters or subtitle data, as neither 3GP (in this configuration) nor WMA support those features.