I am recording audio from mic and save it to .mp4 - it is AMR format. How to convert this audio to mp3 or AAC? I saw this post and I did not understand it - I am new in android.
Is there some easy library for android that can work with mp3? I googled whole day and not found nothing. Maybe some good man can explain and give full example in this post and hundreds of people will be grateful!
Thank you.
You could do that with http://www.javazoom.net/mp3spi/mp3spi.html probably. I am not sure where you were looking for help, but there are tons of articles on StackOverflow about that. You don't have to search for android only stuff. You are using java.
Ex: Any good recommendations for MP3/Sound libraries for java?
Can you avoid recording to AMR (which is lossy format), and record raw PCM samples instead? Then sending those PCM samples directly into AAC or MP3 encoder would give you much better quality. Doing first AMR and then AAC looses information twice.
来源：https://stackoverflow.com/questions/10726762/converting-audio-on-android-to-mp3-or-aac