Batch video to audio. Without the uploads.
Convert your entire video collection to MP3, WAV, AAC, OGG, or FLAC in one go. FFmpeg Onlion's batch audio extractor processes all files locally in your browser — no uploads, no account, completely free.
Why Use Batch Video to Audio Conversion on FFmpeg Onlion?
Most online converters force you to upload one file at a time — and then upload it to their server. FFmpeg Onlion does batch video to audio extraction differently.
100% Local Batch Processing
Every batch video to audio conversion runs inside your browser via WebAssembly. Your video and audio files never touch a remote server — complete privacy for all your files.
True Batch — Queue Multiple Files
Add dozens of videos to the queue at once. FFmpeg Onlion processes them sequentially and lets you download each extracted audio file individually or as a ZIP archive.
5 Audio Output Formats
Extract audio to MP3 (universal), AAC (efficient), WAV (uncompressed), OGG Vorbis (open format), or FLAC (lossless). Choose the right format for every batch conversion.
No Quality Loss on Re-runs
Since FFmpeg Onlion reads your original video files directly, you can re-extract audio in a different format without ever losing quality — unlike upload-based tools that discard your source.
Works Offline After First Load
The ~31 MB WebAssembly core is cached on first use. After that, batch video to audio conversion works without an internet connection — ideal for travel or low-connectivity environments.
Full FFmpeg Power, No Terminal
Under the hood, FFmpeg Onlion uses the real FFmpeg engine. You get professional-grade batch audio extraction with a simple point-and-click interface — no command line needed.
Audio Formats for Batch Video to Audio Conversion
FFmpeg Onlion supports five output formats for batch audio extraction. Here is how to choose the right one for your workflow.
| Format | Codec | Best For | File Size |
|---|---|---|---|
| MP3 | libmp3lame | Universal playback — every device, car stereo, DJ software | Small |
| AAC | aac | Mobile devices, streaming, podcast hosting | Small |
| WAV | pcm_s16le | Professional audio editing, archival masters | Large |
| OGG Vorbis | libvorbis | Open-source projects, game audio, royalty-free distribution | Small |
| FLAC | flac | Lossless archival, audiophile collections, sample libraries | Medium |
How to Batch Convert Video to Audio with FFmpeg Onlion
Four simple steps — no account, no uploads, no software to install.
Load the Engine
Click "Load ffmpeg" once. The WebAssembly core (~31 MB) downloads and caches. This is a one-time step.
Queue Your Videos
Enable "Batch" mode and drop multiple video files at once. They appear in a processing queue.
Pick Audio Format
Select "Extract Audio" and choose your target format — MP3, AAC, WAV, OGG, or FLAC.
Process & Download
Click "Process Video" to run batch extraction. Download each audio file or grab the ZIP.
Common Batch Video to Audio Use Cases
FFmpeg Onlion's batch audio extraction is useful across many different workflows.
Podcast Production
Recorded video interviews? Extract audio from multiple video files in batch to MP3 or AAC for your podcast editing pipeline — no upload tools needed.
Music Library Migration
Have a folder of music videos? Batch convert video to audio and build a clean MP3 or FLAC library from your video collection in one session.
Video Editing Workflows
Extract audio tracks from multiple video clips to WAV for professional editing in DAWs like Logic Pro, Ableton, or Audacity — lossless quality guaranteed.
Lecture & Course Audio
Downloaded video courses? Batch extract audio to AAC or MP3 and listen on the go without storing large video files on your phone.
Game Development
Need OGG Vorbis files for your game engine? Batch convert video captures to OGG — open format, royalty-free, and directly usable in Unity or Godot.
Transcription Prep
Transcribing multiple interviews? Batch extract audio to MP3 or WAV first, then feed the clean audio files into your transcription tool of choice.
Batch Video to Audio — Frequently Asked Questions
Everything you need to know about batch audio extraction with FFmpeg Onlion.
How does batch video to audio work in FFmpeg Onlion?
FFmpeg Onlion uses the real FFmpeg engine compiled to WebAssembly to extract audio tracks from video files. In batch mode, you queue multiple video files, select the "Extract Audio" operation with your preferred output format (MP3, AAC, WAV, OGG, or FLAC), and click process. FFmpeg Onlion runs through each file sequentially in a Web Worker, extracting the audio stream and encoding it to the target format. Everything happens locally inside your browser — the video and audio files never leave your device.
What is the maximum number of files for a batch conversion?
There is no hard limit on the number of files you can queue for batch video to audio conversion. However, practical limits depend on your device's available memory and the total size of the files in the queue. Each file is processed sequentially (one at a time), so memory usage stays manageable. For best results, we recommend processing batches of 20–50 files per session, especially if you are working with large video files like 4K recordings.
Does the batch audio extraction preserve original audio quality?
Quality depends on the output format you select. FLAC provides lossless compression — the extracted audio is bit-for-bit identical to the source. WAV output is uncompressed PCM, also lossless. MP3 and AAC use lossy compression at high-quality settings that are transparent for most listeners. OGG Vorbis is similarly efficient. If you need maximum fidelity, choose FLAC or WAV for your batch extraction.
Can I extract audio from only part of each video in a batch?
Yes — but trim settings apply uniformly across all files in the batch. If you set a start/end trim range before batch processing, FFmpeg Onlion will apply the same time range to every video in the queue. For per-file trimming with different ranges, you would need to process each file individually in single mode.
Is the batch video to audio converter really free?
Yes, completely free. FFmpeg Onlion and its batch audio extraction feature are built on the open-source ffmpeg-webCLI project and licensed under GPL-3.0. There are no usage limits, no premium tiers, and no hidden charges. The entire tool runs in your browser — we have no server costs to offset.
What video formats can I extract audio from in batch mode?
FFmpeg Onlion supports audio extraction from virtually all common video containers: MP4, WebM, MKV, MOV, AVI, FLV, WMV, and more. As long as the video file contains an audio stream, FFmpeg Onlion can extract and convert it in batch mode. It can even handle formats with multiple audio tracks, extracting the primary track by default.