Extract Audio from 3G2 to OGA — Free Online Tool
Extract audio from 3G2 mobile video files and convert it to OGA format using the Vorbis codec — ideal for archiving or replaying audio from CDMA-era mobile recordings in an open, widely supported container. The tool strips the H.264 or AAC video track entirely, producing a clean Ogg Vorbis audio file directly in your browser.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
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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
3G2 files are MPEG-4-based containers developed for 3GPP2 CDMA mobile networks, and they typically carry AAC or MP3 audio alongside H.264 video. During this conversion, FFmpeg discards the video stream entirely using the -vn flag and re-encodes the audio — usually AAC from the 3G2 source — into Vorbis, which is the default codec for the OGA (Ogg Audio) container. This is a transcode, not a remux: the audio is decoded from AAC and re-encoded into Vorbis at the specified quality level. Because both AAC and Vorbis are lossy formats, there is a small generation loss inherent in this step, though at quality level 4 the output Vorbis audio is generally transparent for most content. The resulting OGA file contains only the Vorbis audio stream wrapped in an Ogg container, with no video data.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg command-line tool, which is the engine running under the hood in your browser via WebAssembly (FFmpeg.wasm) for this conversion. |
-i input.3g2
|
Specifies the input file in 3G2 format — the CDMA mobile multimedia container that holds both the video stream (typically H.264) and the audio stream (typically AAC) that will be extracted. |
-vn
|
Disables video output entirely, instructing FFmpeg to ignore the H.264 (or MJPEG) video stream in the 3G2 file so that only the audio content is processed and written to the OGA output. |
-c:a libvorbis
|
Encodes the audio using the libvorbis encoder, which produces Vorbis audio — the default and most compatible codec for the OGA (Ogg Audio) container. Since the 3G2 source uses AAC, re-encoding to Vorbis is necessary as AAC cannot be stored natively in an Ogg container. |
-q:a 4
|
Sets the Vorbis encoder to variable bitrate quality level 4 on a 0–10 scale, targeting approximately 128kbps — a balanced setting well-suited to the typically limited audio quality found in 3G2 files from CDMA mobile devices. |
output.oga
|
Defines the output filename with the .oga extension, which designates an audio-only Ogg container. FFmpeg infers from this extension that it should mux the Vorbis stream into the Ogg format with no video track. |
Common Use Cases
- Recovering speech or voicemails recorded on an older CDMA phone (e.g., Verizon or Sprint devices) that saved clips in 3G2 format, converting them to an open audio format for long-term archiving
- Extracting the audio commentary or narration from a 3G2 mobile video to use in a podcast or audio project without carrying the low-resolution mobile video
- Converting 3G2 audio to OGA for playback in open-source media players like VLC or Rhythmbox that handle Ogg Vorbis natively but may struggle with 3G2 containers
- Stripping the video from 3G2 concert or event clips recorded on early 2000s CDMA phones to preserve just the audio in a format suitable for music archiving
- Preparing audio extracted from 3G2 files for upload to platforms or tools that accept Ogg audio but do not support the 3G2 container format
- Reducing file size for storage by discarding the video track from a collection of 3G2 mobile clips when only the audio content has lasting value
Frequently Asked Questions
Yes, there is a small quality loss because this is a transcode between two lossy codecs — the AAC audio in the 3G2 file is decoded and then re-encoded as Vorbis. However, 3G2 files recorded on CDMA mobile phones often used low bitrates (64k–128k AAC) to begin with, so the source quality is already limited. At Vorbis quality level 4 (roughly 128k variable bitrate), the output is generally indistinguishable from the source for speech and typical mobile recordings. If you need lossless output, you can switch the codec to FLAC using -c:a flac and remove the -q:a flag.
Both .ogg and .oga use the same Ogg container format, but .oga is the officially designated extension for audio-only Ogg files according to the Xiph.Org Foundation's MIME type specifications. Using .oga signals to media players and tools that the file contains only an audio stream (in this case Vorbis), with no video, which can improve compatibility and metadata handling. Most players that support .ogg will also open .oga files without any issue.
Yes, OGA supports FLAC as a lossless audio codec alongside Vorbis and Opus. To use FLAC, change the command to: ffmpeg -i input.3g2 -vn -c:a flac output.oga. Note that FLAC encodes a lossless version of the decoded audio — since the 3G2 source was already lossy AAC, FLAC will preserve the decoded PCM exactly but cannot recover quality lost during the original AAC encoding. The resulting file will be significantly larger than the Vorbis version.
The -q:a flag controls Vorbis quality on a scale from 0 (lowest, ~64kbps) to 10 (highest, ~500kbps). The default in this command is 4, which targets approximately 128kbps variable bitrate and is suitable for most 3G2 source material. For speech-only content like voicemails from a mobile phone, -q:a 2 (around 96kbps) is often sufficient. For the best quality extraction of music, try -q:a 6 or higher. Replace the 4 in the command with your desired value: ffmpeg -i input.3g2 -vn -c:a libvorbis -q:a 6 output.oga.
FFmpeg will attempt to map compatible metadata tags from the 3G2 container to the Ogg Vorbis comment format, but 3G2 files from CDMA mobile devices often carry minimal or no user-readable metadata beyond technical stream properties. Standard tags like title or artist, if present in the 3G2 file, will typically carry over. However, proprietary tags from specific phone manufacturers or carrier-embedded metadata may be dropped. The Ogg container supports rich Vorbis comment tagging, so you can add metadata manually after conversion using a tool like EasyTag or kid3.
The command shown targets a single file, but on a desktop you can batch process with a shell loop. On Linux or macOS: for f in *.3g2; do ffmpeg -i "$f" -vn -c:a libvorbis -q:a 4 "${f%.3g2}.oga"; done. On Windows Command Prompt: for %f in (*.3g2) do ffmpeg -i "%f" -vn -c:a libvorbis -q:a 4 "%~nf.oga". The browser-based tool processes one file at a time, but files up to 1GB are supported at no cost.
Technical Notes
3G2 is structurally close to MP4/M4A, sharing the ISOBMFF base container, but it is specifically profiled for 3GPP2 CDMA networks and may include non-standard boxes or codec configurations that some demuxers handle inconsistently. FFmpeg's 3G2 demuxer is mature and handles the format reliably in most cases. The audio stream in a 3G2 file is most commonly AAC-LC at a low mobile bitrate, though some devices encoded MP3 audio instead. Because the OGA container does not support AAC or MP3 directly, re-encoding to Vorbis (or FLAC/Opus) is required — there is no remux path here. The Vorbis encoder's -q:a variable bitrate system produces efficient files, but be aware that very short or low-bitrate 3G2 clips may result in OGA files that are proportionally larger due to Vorbis frame overhead at low durations. OGA does support chapter markers, but 3G2 files do not carry chapter data, so the output will have no chapters. Multiple audio tracks are not supported in either format, so only the first (and typically only) audio stream is extracted.