How do you compress audio silence?
I'm using Audacity and have been exporting variable compression mp3s. But a 1minute audio track is about the same file size regardless of how much silence there is.
And it's complete silence (0% audio).
Is there another audio compression format I have to use, or a config option, I'm missing. My audio tracks are 75% silent (because it's instructional audio), and I need to optimize them for the web.
Apparently, OGG might, but it doesn't look well supported in Safari and IE.
Here are my results.
Original: audio clip of 34s of dialogue.
Silenced: audio clip of 34s with 20s silences (14s of dialogue).
- Avg compression @ 128bits: 490KB vs 497KB
- Standard preset: 567KB vs 527KB
- Variable compression (145-185kb): 472KB vs 436KB
- Ogg (5 quality): 398KB vs 176KB <-- Success!!