Audio File Speed Control

AnkiWeb addon 225211451

Permanently speeds up card audio files with pitch preservation via FFmpeg, offering previews, batch processing, skip-processed handling, and one-click undo while preserving originals.
AI-generated summary; may contain mistakes.

note-management

Open on AnkiWeb GitHub Find alternatives

AnkiWeb

Votes
2 (👍 2 · 👎 0)
Updated
2026-02-18
Anki versions
2.1.66~
License
MIT (from the README)
Virus scan
No ClamAV match A match does not prove malware. No match does not prove that the code is safe.
Languages
Python, JSON
Description language
en

Maintenance

stale

  • Last update or commit: 2026-02-18 (256 days before the snapshot).
  • Commits in the last year: 8.
  • Issues: 0 open, 0 closed.
  • Pull requests: 0 open, 0 merged.

Will it work on my Anki?

Version branches
Min AnkiMax AnkiUpdated
2.1.452.1.66+2026-02-18
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Description

For support, email the developer at r@rayamjad.com.

About

Audio File Speed Control is an Anki add-on that lets you permanently speed up the audio files embedded in your cards — with pitch preservation — so they play back faster every time, not just during review.

It works by re-encoding your audio files using FFmpeg at whatever speed you choose, then updating your card references to point to the new files. Your originals are always kept.

It supports the following formats:

  • MP3
  • WAV
  • OGG
  • M4A
  • MP4 / WebM

Features

⚡ Permanent Speed-Up

  • Speeds up audio at the file level, not just playback — works everywhere Anki plays sound
  • Pitch is preserved using FFmpeg's atempo filter, so audio doesn't sound chipmunk-y

🔍 Preview Before You Commit

  • Preview sped-up audio on a sample of your cards before processing anything
  • Compare original vs. sped-up side by side in the dialog

🗂️ Batch Processing

  • Select any number of cards in the browser and process them all at once
  • Skips already-processed files by default so you don't double-process
  • Progress bar with cancellation support

↩️ Undo Support

  • One-click undo that reverts card references back to the originals
  • Created files can be cleaned up later with Anki's built-in Check Media tool

Images

Screenshot 1

Requirements

  • Anki 23.10 or later
  • FFmpeg installed and available in your PATH

On macOS you can install it with: brew install ffmpeg

How to Use

  1. Open the Card Browser in Anki
  2. Select the cards whose audio you want to speed up
  3. Go to Edit > "Speed Up Audio..."
  4. Adjust the speed slider
  5. Optionally click Generate Preview to hear a sample before committing
  6. Click OK to process all selected cards

Common Issues

"FFmpeg not found" error

  • Install FFmpeg. On macOS: brew install ffmpeg. On Windows, download from ffmpeg.org and add it to your PATH.

Some files failed to process

  • Check that the audio files actually exist in your Anki media folder. If cards were synced without media, the files may be missing.

Audio sounds distorted at high speeds

  • The atempo filter works best between 1.0x and 2.0x. Consider staying under 2.5x for best quality.

Nothing happens when I select cards

  • Make sure the selected cards actually have [sound:...] fields. Cards with only text won't trigger the dialog.

About Me

Hey, I'm Ray. I make videos on YouTube.

README

Audio File Speed Control

An Anki add-on that permanently speeds up audio files in your cards with pitch preservation, so they play back faster everywhere — not just during review.

Screenshot

How It Works

Select cards in the browser, pick a speed, preview, and confirm. The add-on re-encodes your audio files using FFmpeg's atempo filter and updates your card references to point to the new files. Originals are always preserved.

Requirements

Usage

  1. Open the Card Browser
  2. Select cards with audio
  3. Edit > "Speed Up Audio..."
  4. Set speed, optionally click Generate Preview to hear a sample
  5. Click OK to process

Features

  • Pitch-preserving speed change via FFmpeg atempo
  • Preview sped-up audio before committing
  • Batch processing with progress bar and cancellation
  • Skip already-processed files
  • One-click undo (reverts card references)
  • Supports MP3, WAV, OGG, M4A, MP4, WebM

License

MIT