Why OGG Files Need Normalization
OGG Vorbis files come from many sources — game soundtracks, Spotify caches, personal rips, and web audio. A game's background music might sit at -20 LUFS, while a pop track ripped at full volume could be -8 LUFS. That's a 12 dB gap — one sounds roughly 2.5x louder than the other.
When you convert these OGG files to MP3 for portable use, the volume differences carry over. Normalization fixes this by adjusting every file to the same perceived loudness before encoding.
No extra quality loss: Normalization is a simple volume adjustment applied before the MP3 encoding step. It doesn't add any degradation beyond the normal OGG-to-MP3 conversion. The gain change itself is mathematically lossless.
Which LUFS Target to Choose
Each platform has its own loudness standard. Here are the targets for the three presets available in the converter above:
| Preset | Target | True Peak | Best For |
|---|---|---|---|
| Podcast (-16 LUFS) | -16 LUFS | -1.5 dBTP | Apple Podcasts, spoken word, audiobooks |
| Streaming (-14 LUFS) | -14 LUFS | -1 dBTP | Spotify, YouTube, Tidal, Amazon Music |
| Broadcast (-23 LUFS) | -23 LUFS | -1 dBTP | EBU R128, European TV/radio |
Most common choice: If you're converting OGG files for personal listening or Spotify/YouTube upload, use Streaming (-14 LUFS). For podcast OGG recordings, use Podcast (-16 LUFS).
How Normalization Works During Conversion
When you upload an OGG file and select a normalization preset, Convertio performs two operations in a single pass:
- OGG → MP3 conversion: The Vorbis audio is decoded and re-encoded to MP3 using libmp3lame (VBR V2 by default)
- Loudness normalization: FFmpeg's
loudnormfilter analyzes the audio's integrated loudness (LUFS) and applies a constant gain adjustment to reach the target level
The normalization is linear — a single gain value applied uniformly across the entire file. It does not compress dynamics, alter frequency response, or change the stereo image. A true peak limiter at -1 dBTP prevents clipping.
Normalizing Game Audio and Soundtracks
Many video games store their audio as OGG Vorbis — it's open-source, royalty-free, and efficient. If you're extracting game soundtracks for personal listening, you'll notice they're often mastered at lower loudness levels than commercial music to leave headroom for dynamic moments in gameplay.
Normalizing game OGGs to -14 LUFS brings them in line with commercial music loudness, so they blend naturally into your music library without sounding quiet.
When Should You Normalize?
- Converting game soundtracks: Game audio is typically quieter than commercial music. Normalize to -14 LUFS for consistent library playback
- Mixed OGG collections: Files from different games, apps, and sources at different levels. Normalization evens them out
- Uploading to Spotify or YouTube: These platforms normalize incoming audio anyway — delivering at the target loudness avoids platform-side adjustment
- Creating playlists: OGG files mixed with music from other sources need consistent volume for a smooth listening experience
For a deep dive into LUFS measurement and platform-specific targets, see our complete LUFS guide. For choosing the right MP3 bitrate for your OGG files, see the bitrate guide.