Extract Audio from 3GPP to WEBA — Free Online Tool
Extract audio from 3GPP mobile video files and convert it to WEBA format, encoding the audio stream with the Opus codec for efficient, high-quality web playback. This is ideal for pulling audio from mobile-recorded 3GP videos — which typically carry AAC or MP3 audio — and repackaging it into a modern, browser-native WebM audio container.
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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
3GPP files store audio most commonly as AAC or MP3 streams inside a mobile-optimized container designed for 3G networks. During this conversion, FFmpeg discards the video stream entirely (using the -vn flag) and transcodes the audio — whether it was AAC or MP3 — into Opus, a modern lossy codec optimized for web streaming and low-latency playback. The result is a .weba file, which is essentially a WebM container holding only the Opus-encoded audio track. Because 3GPP audio is typically encoded at low bitrates suited for mobile networks, the output quality at 128k Opus will generally match or exceed the quality of the original audio track.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg tool, the open-source multimedia processing engine running here via FFmpeg.wasm compiled to WebAssembly and executed entirely in your browser. |
-i input.3gp
|
Specifies the input file — a 3GPP mobile video container (.3gp) that typically contains a low-bitrate video stream alongside an AAC or MP3 audio track. |
-vn
|
Disables video output, ensuring the 3GPP video stream is completely dropped and the resulting WEBA file contains only the extracted audio track. |
-c:a libopus
|
Selects the Opus encoder for the audio stream, transcoding the original 3GPP audio (typically AAC) into Opus — the modern, royalty-free codec natively supported by all major browsers in WebM/WEBA containers. |
-b:a 128k
|
Sets the Opus audio output bitrate to 128 kilobits per second, which provides good quality for both voice and music content extracted from 3GPP sources, and is well above the typical bitrate of the original 3GP audio track. |
-vn
|
A second occurrence of the video-disable flag applied to the output side of the command, redundantly confirming that no video stream should be written into the WEBA container — harmless and does not affect the output. |
output.weba
|
The output filename with the .weba extension, which tells FFmpeg to write the Opus audio into a WebM container and signals to browsers and media players that this is an audio-only WebM file. |
Common Use Cases
- Extracting a voice memo or field recording captured on an older mobile phone that saved files in 3GP format, to use in a web-based audio player or podcast workflow
- Pulling the audio track from a 3G-era mobile video to embed directly in a web page using an HTML5 <audio> element, which natively supports WEBA/Opus
- Archiving audio content from old 3GPP video clips while discarding the low-resolution mobile video stream that is no longer useful
- Converting mobile interview recordings shot in 3GP format into WEBA for use in a browser-based content management system that requires WebM-compatible audio
- Stripping audio from 3GPP promotional or instructional videos recorded on legacy devices to repurpose the audio commentary for a web application
Frequently Asked Questions
Some quality loss is possible since this is a transcode between two lossy formats — the original AAC audio in the 3GP file is decoded and then re-encoded as Opus. However, 3GPP files are designed for low-bitrate mobile networks and are often encoded at 64k or lower, while the default output is Opus at 128k. In practice, the Opus output will often sound comparable to or better than the source because Opus is a more efficient modern codec, especially for voice content.
WEBA and WebM share the same underlying container format (Matroska-based WebM), but .weba is the conventional extension used when the file contains only an audio track with no video. Browsers and media players recognize both extensions, but .weba signals to the user and the operating system that this is an audio-only file, which is accurate for what this tool produces.
Opus audio in a WebM/WEBA container is natively supported in Chrome, Firefox, Edge, and Opera. Safari added Opus support in version 11 and WebM support more broadly in later versions, so modern Safari should handle .weba files as well. iOS support has historically lagged but has improved; if broad iOS compatibility is critical, consider converting to M4A instead.
Increasing the -b:a value (for example, from 128k to 192k or 256k) will not recover quality that was lost when the original 3GP file was encoded. The source audio is already lossy, so re-encoding it at a higher bitrate simply produces a larger file with no perceptible quality gain. The best practice is to use a bitrate at or near the original source bitrate — 64k or 96k Opus is typically sufficient for 3GPP-sourced audio.
To change the bitrate, replace '128k' in '-b:a 128k' with your desired value, such as '64k' or '96k'. To use Vorbis instead of Opus, replace '-c:a libopus' with '-c:a libvorbis' — Vorbis is an older WebM-compatible codec with broader legacy support but generally lower efficiency than Opus at the same bitrate. The full command would then read: ffmpeg -i input.3gp -vn -c:a libvorbis -b:a 96k -vn output.weba
Yes. On Linux or macOS, you can use a shell loop: for f in *.3gp; do ffmpeg -i "$f" -vn -c:a libopus -b:a 128k -vn "${f%.3gp}.weba"; done. On Windows Command Prompt, use: for %f in (*.3gp) do ffmpeg -i "%f" -vn -c:a libopus -b:a 128k -vn "%~nf.weba". This is especially useful for processing large collections of old mobile recordings that exceed the 1GB browser limit.
Technical Notes
3GPP files (.3gp) use a container structure closely related to MP4/ISOM and most commonly carry AAC-LC audio, though some devices used MP3 (libmp3lame). The -movflags +faststart flag relevant to 3GP output is not needed here since this conversion produces WEBA output, not a seekable MP4-family file. The -vn flag appears twice in the resolved command — the first instance explicitly suppresses video stream mapping before codec assignment, and the second is technically redundant but harmless. Opus, standardized in RFC 6716, excels at both speech and music content and operates efficiently at bitrates between 64k and 128k, making it a strong match for 3GPP audio which is typically voice or low-fidelity music recorded on mobile devices. Metadata from the 3GP container (such as creation date or artist tags) may not be fully preserved in the WEBA output, as WebM metadata support differs from the MP4-family container used by 3GPP. If metadata preservation is important, verify the output with ffprobe after conversion.