Convert WEBA to AC3 — Free Online Tool
Convert WEBA audio files (WebM audio containers with Opus or Vorbis encoding) to AC3, Dolby Digital's widely supported surround sound format used in DVDs, Blu-rays, and broadcast TV. This tool re-encodes the compressed web audio stream into the AC3 codec at 192k bitrate by default, making your audio compatible with home theater systems and professional video production workflows.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your WEBA file here
or click to browse
Free — no uploads, no signups. Your files never leave your browser.
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
WEBA files store audio in a WebM container, almost always encoded with Opus (or occasionally Vorbis) — a codec optimized for low-latency web streaming but not natively supported by most DVD players, Blu-ray authoring tools, or broadcast equipment. During this conversion, FFmpeg decodes the Opus or Vorbis audio stream from the WEBA container, then re-encodes it from scratch using the AC3 (Dolby Digital) codec at 192k bitrate. Because Opus and AC3 are fundamentally different codecs with different psychoacoustic models, this is a full transcode — not a remux — meaning audio goes through a decode-then-re-encode cycle. The output is a raw AC3 bitstream file (.ac3) with no container wrapper, which is the standard format expected by DVD/Blu-ray authoring tools and certain broadcast ingest pipelines.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program, the open-source multimedia processing engine running under the hood of this browser-based tool via WebAssembly (FFmpeg.wasm). |
-i input.weba
|
Specifies the input file — a WEBA audio file containing an Opus or Vorbis audio stream inside a WebM container. FFmpeg will detect which audio codec is present and decode it automatically. |
-c:a ac3
|
Instructs FFmpeg to encode the audio stream using the AC3 (Dolby Digital) codec. This triggers a full re-encode from Opus/Vorbis to AC3, converting the web-optimized audio into a format compatible with DVD, Blu-ray, and broadcast systems. |
-b:a 192k
|
Sets the AC3 output audio bitrate to 192 kilobits per second, which is the standard bitrate for stereo Dolby Digital audio in DVD production. You can raise this to 384k or 448k for higher fidelity, particularly for 5.1 surround content. |
output.ac3
|
Defines the output filename with a .ac3 extension, which tells FFmpeg to write a raw Dolby Digital bitstream without any container wrapper — the format expected by DVD and Blu-ray authoring tools and broadcast ingest pipelines. |
Common Use Cases
- Preparing web-recorded audio (such as a browser-captured meeting or lecture saved as WEBA) for inclusion in a DVD or Blu-ray authoring project that requires Dolby Digital AC3 audio tracks
- Converting Opus-encoded WEBA audio captured from a WebRTC or browser-based recording session into an AC3 track for muxing into an MPEG transport stream for broadcast television
- Replacing the audio track in a video project where your NLE (non-linear editor) or DVD authoring software like DVD Studio Pro or Encore requires AC3-formatted audio rather than Opus
- Archiving web audio content in Dolby Digital format for playback on standalone home theater receivers and AV processors that support AC3 but not Opus
- Converting downloaded WEBA audio files from a web archive or streaming capture into AC3 for compatibility with older media players and set-top boxes that predate Opus support
- Creating AC3 audio stems from browser-based audio production tools that export in WEBA format, for delivery to a post-production facility with Dolby Digital requirements
Frequently Asked Questions
Yes, some quality loss is expected because this is a lossy-to-lossy transcode — the Opus audio in the WEBA file is decoded to uncompressed PCM and then re-encoded using the AC3 codec. Each compression step introduces its own artifacts, and the psychoacoustic models used by Opus and AC3 are quite different. At the default 192k bitrate, AC3 audio is generally transparent for most content, but if your source WEBA was encoded at a low bitrate (e.g., 64k Opus), the quality ceiling of the output is limited by the source. For best results, always start with the highest-quality WEBA source available.
AC3 is a raw bitstream format — the .ac3 extension indicates a headerless Dolby Digital audio stream with no container wrapper around it. This is the format expected by DVD and Blu-ray authoring tools when you're supplying pre-encoded audio tracks, and it's what broadcast ingest systems often require. If you need the AC3 audio embedded inside a video container like MKV or MP4 for media player use, you would need an additional step to mux the .ac3 file into that container.
WEBA files with Opus encoding do technically support multi-channel audio, including 5.1 surround, because Opus can encode up to 255 channels. However, most browser-captured WEBA files are stereo (2-channel) since browsers typically record from stereo inputs. If your WEBA file contains 5.1 audio, FFmpeg will pass through all six channels to the AC3 encoder, which natively supports 5.1 Dolby Digital. If your source is stereo, the output will be stereo AC3 — the conversion will not upmix channels.
Modify the -b:a flag in the command to your desired bitrate. AC3 supports 96k, 128k, 192k, 256k, 320k, 384k, 448k, and 640k. For example, to produce a high-quality 384k AC3 file run: ffmpeg -i input.weba -c:a ac3 -b:a 384k output.ac3. For 5.1 surround content, 384k or 448k is a common broadcast standard, while 192k is typically used for stereo content. Note that AC3 bitrates are constrained to specific valid values — entering an arbitrary bitrate may cause FFmpeg to snap to the nearest valid option.
Yes. On Linux or macOS, you can run a loop in your terminal: for f in *.weba; do ffmpeg -i "$f" -c:a ac3 -b:a 192k "${f%.weba}.ac3"; done. On Windows Command Prompt, use: for %f in (*.weba) do ffmpeg -i "%f" -c:a ac3 -b:a 192k "%~nf.ac3". This is especially useful when you have many WEBA files from a browser recording session and need to batch-convert them all for a DVD authoring project. The browser-based tool on this page handles single files, so the FFmpeg command is the recommended path for batch processing.
Mostly no. Raw AC3 bitstream files (.ac3) have very limited metadata support compared to container formats like MP4 or MKV. While FFmpeg will attempt to pass along any metadata tags present in the WEBA source, the .ac3 format has no standardized metadata container, so tags like title, artist, and album will typically be discarded. If metadata preservation is important, consider muxing the AC3 stream into an MKV or MP4 container after conversion, where metadata tagging is fully supported.
Technical Notes
WEBA is an audio-only variant of the WebM container and is almost universally paired with the Opus codec in modern browsers, though older WEBA files may contain Vorbis audio. FFmpeg detects whichever codec is present and decodes it correctly before re-encoding to AC3. The AC3 encoder in FFmpeg (the native ac3 encoder) is well-tested and produces standards-compliant Dolby Digital bitstreams compatible with consumer and professional hardware. One important limitation is that AC3 supports a maximum of 6 channels (5.1) and a maximum bitrate of 640k — if you attempt to encode from a WEBA source with unusual channel counts beyond 6, FFmpeg may error or require explicit channel mapping. Additionally, because Opus uses a variable bitrate model with very efficient low-latency encoding and AC3 uses a fixed-bitrate block-based model, the perceptual quality mapping between equivalent bitrates is not straightforward: 128k Opus generally sounds better than 128k AC3, meaning you may want to target a higher AC3 bitrate than your source Opus bitrate to maintain perceived quality. The output .ac3 file is not playable by most media players without the AC3 codec installed, though VLC and most FFmpeg-based players handle it natively.