After you encoded the frame, and have done the things you have to do, your data buffer will be filled with the audio. Now it depends how your format is (see here ) and how many channels you have. Let's assume it is signed 16bit stereo, than your buffer would look like:
1. I am not completely sure what you mean by 'bitrate quality of 16bit' but I suspect that FFmpeg could help you out with something like: ffmpeg -i my_input_file.mp3 -c:a pcm_s16le -ar 44100 my_output_file.wav. Different options for the output wav file can be seen with ffmpeg -formats | grep PCM. – andrew.46 ♦.
On Linux systems, installing ffmpeg gives us access to the ffmpeg command, which can be used to convert audio files to various types, such as wav, mp3, ogg, etc. In this guide, we will go over the instructions to install ffmpeg on major Linux distros.
A script with an easy to use interface to convert audio files: wav, mp3, ogg, flac, aac, mpc, ape and wma The Arch Linux name and logo are recognized trademarks
Supported input formats: WAV, FLAC, APE, WavPack, True Audio (TTA). Supported out formats: FLAC, WAV, WavPack, AAC, OGG or MP3. Automatic character set detection for CUE files. To use it you only need to open the *.cue file with Flacon.

Usage. For ease of use, add the script to your PATH. Open up a terminal, cd to the directory of FLAC files that you wish to convert, and invoke flac2mp3 (or whatever you named the script). You will see the verbose decoding/encoding process in the terminal which may take a few moments. Done!

Assuming the audio file is relatively large, we can't write the entire WAV data at once, because doing so (without "draining" stdout pipe) causes the program execution to halt. We may have to write the WAV data (in chunks) in a separate thread, and read the encoded data in the main thread. Here is a sample for the "writer" thread:
In order to convert WMA file into MP3 format in Ubuntu (or Debian) you should install the following requirements first: and then convert file.wma into file.mp3 using the following console command: mplayer -vo null -vc dummy -af resample=44100 -ao pcm:waveheader file.wma;lame -m s -V 3 audiodump.wav;mv audiodump.wav.mp3 file.mp3;rm audiodump.wav.
With Total Audio Converter you can use batch mode to convert WAV to MP3. Most interesting, whether you convert one file or to hundred files, the speed is almost the same. It takes just a few seconds to render WAV files in the MP3 format. Total Audio Converter integrates into Windows. Once it is downloaded and installed, Convert to option

For any version. I found a neat way to do this with mplayer. This script will rename the files to remove all blank spaces in the names of the files and will recursively convert all .wma files in the current directory to .mp3:

youtube-dl has an option to convert videos to mp3, along with an audio quality setting; it uses ffmpeg/avconv. FWIW, for music I download the highest quality webm format (usually #251), convert it to wav, trim and normalize that wav file, then convert it to mp3 with lame. .
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    • convert wav to mp3 linux