Re: Several beginner q's about Sox encoding (mp3/aac)?

[harsh kurra <harshkurra21@gmail.com>]

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*3. Is it possible to compile SOX with AAC encoding support? I want to try
AAC encoding to see if that eliminates the clicks and pops .*

I used FAAD2 AAC <http://www.audiocoding.com/downloads.html> decoder to add
support for .m4a or any AAC format in SOX for my own personal use on
windows platform.

The code is available on Bitbucket repo <https://bitbucket.org/hkurra/sox>.

On Tue, Feb 21, 2017 at 9:13 AM, christina zou <zou.christina@gmail.com>
wrote:

> Hi,
>
> I have a Raspberry Pi running Debian Jessie, as well as a MEMS I2S mic and
> a Pi Camera. My mic records 32bit raw PCM audio. I am trying to stream
> video and audio to Youtube Live. I am using Sox for audio recording and
> encoding.
>
> YouTube Live only accepts mp3 or aac encoded audio.
>
> I have installed sudo apt-get install libsox-fmt-mp3, so my Sox is able
> to encode mp3.
>
> I am using this command to record and encode audio:
>
> rec --buffer 2000000 -c 1 -r 44100 -b 32 test.mp3
>
> /usr/bin/rec WARN formats: mp3 can't encode to 32-bit
>
> Input File     : 'mic_mono' (alsa)
>
> Channels       : 1
>
> Sample Rate    : 44100
>
> Precision      : 32-bit
>
> Sample Encoding: 32-bit Signed Integer PCM
> -------
> 1. I get the warning: " mp3 can't encode to 32-bit" - what should I do
> about this?
> 2. My resultant MP3 file has small clicks and popping noises throughout. I
> know this is not a problem with my mic, as I've produced AAC encoded audio
> with FFMPEG that was perfectly clean. Any idea why this is happening?
> 3. Is it possible to compile SOX with AAC encoding support? I want to try
> AAC encoding to see if that eliminates the clicks and pops.
>
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-- 
Thanks

Harsh kurra ¯\(ツ)/¯

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