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phetsims / vibe

Library for handling audio for PhET simulations. Provides cross-platform support and enables usage of base64 audio embedded in an HTML document.
MIT License
3 stars 3 forks source link

Reduce the size of the audio effects to the minimum with acceptable sound quality #7

Closed jbphet closed 9 years ago

jbphet commented 11 years ago

It may well be possible to use sound effects encoded at a rate that reduces the size of the files.

pixelzoom commented 9 years ago

Do we want to do this before "Summer 2015 redeploy"?

jbphet commented 9 years ago

The primary audio effects in the common code are those used in the game. There are four sound effects: ding (correct answer), boing (incorrect answer), trumpet (finished level with some correct answers), and cheer (finished level with all correct answers). I normalized all four files to 0.0 dB (see https://github.com/phetsims/vegas/issues/35) and re-encoded them at 32kbps for MP3 and at quality=4 for Ogg Vorbis. This reduced the sum total size for all eight files to be 100kb, which seems pretty reasonable.

jbphet commented 9 years ago

Assigning to @ariel-phet to help determine how to test these sounds and see if the quality level is acceptable. I'm thinking we should assign to @bryo5363 or @phet-steele, since they have some audio experience and young ears, and/or @pixelzoom since he also has audio experience.

samreid commented 9 years ago

Did you happen to jot down the sum total size before compression so we can see the difference? I'm curious.

oliver-phet commented 9 years ago

I tested across my computer using internal speakers and microphone, and 2 iPads and the difference was not noticeable (great job @jbphet!). Closing.