Extract Audio from 3G2 to OGG — Free Online Tool
Extract audio from 3G2 mobile video files and convert it to OGG format using the open Vorbis codec. This tool strips the AAC or MP3 audio track from 3GPP2 container files — originally designed for CDMA networks — and re-encodes it as a high-quality Vorbis stream inside an OGG container, ideal for open-source media players and Linux-based workflows.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your 3G2 file here
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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
3G2 files typically carry AAC audio (the default for 3GPP2) or occasionally MP3 audio, wrapped in a container built for low-bandwidth CDMA mobile transmission. During this conversion, the video stream is completely discarded (using the -vn flag), and the audio stream is decoded from its original AAC or MP3 encoding and then re-encoded as Vorbis using libvorbis. This is a full transcode — not a remux — because neither AAC nor MP3 can be stored directly in an OGG container without re-encoding to a Xiph.Org-compatible codec like Vorbis, Opus, or FLAC. The output is a pure audio OGG file with no video data, significantly smaller than the original 3G2 file.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg command-line tool, which is running here as a WebAssembly (FFmpeg.wasm) instance directly in your browser — no server involved. The same binary on your desktop will accept this identical command for files over 1GB. |
-i input.3g2
|
Specifies the input 3G2 file — a mobile multimedia container from the 3GPP2 standard, typically containing an H.264 video stream and an AAC audio stream recorded on a CDMA-era smartphone. |
-vn
|
Disables video output entirely, discarding the H.264 (or MJPEG) video track from the 3G2 file. This is what makes the output a pure audio-only OGG file rather than a video container. |
-c:a libvorbis
|
Re-encodes the audio using the libvorbis encoder, producing Vorbis audio — the native and most compatible audio codec for the OGG container. This is necessary because OGG cannot carry the AAC audio stream from the 3G2 file directly. |
-q:a 4
|
Sets the Vorbis variable bitrate quality level to 4 on a 0–10 scale, targeting approximately 128 kbps. This is a balanced default that typically matches or exceeds the audio fidelity of the low-bitrate AAC streams commonly found in 3G2 mobile recordings. |
output.ogg
|
Defines the output filename and tells FFmpeg to write an OGG container. The .ogg extension signals the Xiph.Org open container format, which will hold the newly encoded Vorbis audio stream extracted from the original 3G2 file. |
Common Use Cases
- Recovering audio from old 3G2 video clips recorded on early CDMA smartphones (e.g., Verizon or Sprint-era phones) for use in open-source media projects
- Converting 3G2 voicememos or audio messages into OGG/Vorbis format for playback in Linux desktop environments where AAC support may require proprietary codecs
- Archiving audio content from 3G2 files in an open, patent-free format for long-term storage without relying on proprietary codec licenses
- Extracting background music or ambient audio from 3G2 clips captured on older mobile devices for use in creative commons or open-source multimedia productions
- Preparing mobile-recorded audio content for upload to platforms like Bandcamp or Internet Archive that accept or prefer OGG/Vorbis files
- Stripping audio from 3G2 video files to reduce file size before importing into open-source audio editors like Audacity or Ardour that natively support OGG/Vorbis
Frequently Asked Questions
Yes, there is a generation loss because this is a transcode between two lossy codecs — the original AAC audio in the 3G2 file is fully decoded and then re-encoded as Vorbis. However, 3G2 files were originally encoded at low bitrates for CDMA mobile networks, so the source audio quality is often already limited. At the default Vorbis quality setting of -q:a 4 (roughly 128 kbps variable bitrate), the output will typically sound identical or very close to the 3G2 source for most listeners.
The OGG container format, developed by Xiph.Org, is specifically designed to carry Xiph.Org codec streams such as Vorbis, Opus, and FLAC. It does not support AAC or MP3 streams natively. Attempting to copy the AAC stream into an OGG container would result in an incompatible or unplayable file, so full re-encoding to libvorbis is required for a valid OGG output.
Change the -q:a value to control Vorbis quality. The scale runs from 0 (lowest, ~64 kbps) to 10 (highest, ~500 kbps), with 4 being the default (approximately 128 kbps variable bitrate). For example, use -q:a 6 for higher quality (~192 kbps) or -q:a 2 for a smaller file (~96 kbps). Since 3G2 source audio is typically low bitrate to begin with, raising the quality above 5 or 6 provides diminishing returns — the Vorbis encoder cannot recover detail that was lost during the original 3G2 encoding.
Yes. Opus is a newer, more efficient codec that also uses the OGG container and is supported by FFmpeg. To use it, replace -c:a libvorbis -q:a 4 with -c:a libopus -b:a 128k in the FFmpeg command. Opus generally achieves better quality than Vorbis at the same bitrate, especially for speech content — which is common in 3G2 mobile recordings. However, OGG/Vorbis has broader legacy software compatibility, so the choice depends on your target playback environment.
Some basic metadata may transfer over during the conversion, but 3G2 files use the MPEG-4 metadata atom structure (similar to MP4), while OGG uses the Vorbis Comment tag format. FFmpeg will attempt to map compatible fields such as title, artist, and date automatically. However, mobile-device-specific metadata embedded in 3G2 files — such as GPS coordinates or device model — will likely be dropped because OGG/Vorbis Comment tags have no standardized fields for this data.
The displayed command processes one file at a time, but you can batch process on the desktop using a shell loop. On Linux or macOS, run: for f in *.3g2; do ffmpeg -i "$f" -vn -c:a libvorbis -q:a 4 "${f%.3g2}.ogg"; done. On Windows Command Prompt, use: for %f in (*.3g2) do ffmpeg -i "%f" -vn -c:a libvorbis -q:a 4 "%~nf.ogg". Batch processing in the browser tool requires uploading and processing files individually.
Technical Notes
3G2 was designed by the 3GPP2 consortium for CDMA-based mobile networks (used by carriers like Verizon and Sprint) and is closely related to MP4/MOV in its MPEG-4 container structure, but with stricter constraints for low-bandwidth transmission. The audio inside 3G2 files is almost always AAC-LC at low bitrates (typically 24–96 kbps), tuned for speech clarity over data efficiency. When converting to OGG, libvorbis uses a variable bitrate (VBR) encoding model controlled by the -q:a quality scale, which is different from the fixed or average bitrate model AAC uses — this means the OGG file size will vary depending on the complexity of the audio content rather than being predictable. OGG supports chapter markers and multiple audio tracks, but since a single 3G2 audio stream is being extracted, only one audio track will be present in the output. The OGG container does not support video, so this tool is inherently audio-only and the video track is non-optionally discarded. FLAC encoding is also possible within OGG if lossless output is desired, but given the lossy AAC source in 3G2, using FLAC would increase file size substantially without recovering any lost audio fidelity.