16bit PCM streams merge?

Question

0.00/5 (No votes)

See more:

Hi There

I am using ffmpeg and I am able to receive PCM audio packets from 3 different mics to one program, I want to be able to merge the audio and then save it to file, but I dont know how to merge these audio inputs, I am receiving packets from each mic one at a time and I dont have a timestamp or a way to know when to merge the audio streams.

1.) Does anyone know how I can achieve this using ffmpeg?
2.) Is there a way to figure out what the timestamp is on these so that I can merge the proper PCM packets?

Thanks in advance.

Posted 9-Jul-14 19:22pm

godspeed123

Add a Solution

Comments

Bernhard Hiller 10-Jul-14 2:31am

How do you "receive" the "audio streams"? Can you be sure that the "clocks" of the microphones run at exactly the same speed? Better make sure that it is one clock controlling all microphones.
Why don't you record three channels in parallel, and then later on claculate the "mono mix" from the 3 channels?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Albert Holguin · Answer 1 · 2014-07-10T11:14:00

Assuming your input is synched in time and you're using the same PCM sampling on all channels... just make a "mixer"...
http://stackoverflow.com/questions/5126169/programmatically-merging-two-pieces-of-audio/5126209#5126209[^]
That's one example, but I'm sure you can find a handful of examples online. As for time stamping, I'm not sure what your audio sources are or how you're getting your input.