optimised sound
HI, please excuse me if the information is already on the forum but I have searched and not found anything that has seems to answer my questions. I have been playing with optimising the sound for an iphone version of an ipad storybook. The Ipad version is working out fine and I'm now working on crushing the Iphone version to sit under 20 meg for download. This I have done largely by resizing the graphics to sit in power of 2 rules (changing the size for the actors in photoshop to all sit at 256x256 for those that fill the full screen and then resizing the actors in GS to fill the screen). There is some quality loss of course but it is acceptable for what I am using them for.
Now I am working on shrinking the audio. Using Audacity I've changed the speed/pitch of samples up and saved them and in GS slowed them down to original speed/pitch and this has saved me about 40% of the audio file sizes and seems to produce reasonable quality sound.
I am now hunting for other techniques that will save file size. Does anyone know if there is a similar rule of 2 for sound files that can be used?
The sample rate in my wav to ogg transcoder seems to just have data rates rather than sample sample rates so I have been crushing samples with that, but wonder if there is a way to use lower sample rates. Does anyone have experience of this or is it not really compatible with the ogg format?
Any methods would be more than welcome.
kipper
Now I am working on shrinking the audio. Using Audacity I've changed the speed/pitch of samples up and saved them and in GS slowed them down to original speed/pitch and this has saved me about 40% of the audio file sizes and seems to produce reasonable quality sound.
I am now hunting for other techniques that will save file size. Does anyone know if there is a similar rule of 2 for sound files that can be used?
The sample rate in my wav to ogg transcoder seems to just have data rates rather than sample sample rates so I have been crushing samples with that, but wonder if there is a way to use lower sample rates. Does anyone have experience of this or is it not really compatible with the ogg format?
Any methods would be more than welcome.
kipper