Digital Audio

Digital audio is technology that can be used to record, store, generate, manipulate, and reproduce sound using audio signals encoded in digital form. Following significant advances in technology, digital rapidly replaced analog audio technology in most areas. Digital audio systems may include compression, storage, processing and transmission components. It is important to distinguish between the audio coding format, the codec performing the encoding and decoding of the raw audio data, and the container file. Common file formats include .wav, .aiff, .au, .m4a, .mp3, .wma, .ra and .raw.

Share tech news, updates, or what's on your mind.

Sign up to Post

I don't know anything yet about reading/writing/manipulating mp3 and mp4 files, but I'm trying to learn.  I need to write a program that reads in mp3 and mp4 files, silences some of the audio portions, and rewrites out the final file.

For an mp3 file, I can use ffmpeg to convert it to a wav file and process and write it back out as an mp3.  I don't think a wav has any messy internals.

For mp4, what with variable bit rates and metadata and such, I don't know how to approach it.  I need to read the mp4 file, modify the audio portion only while staying in sync with the video, and write out the mp4 file again.

My preferred langauge is Python if at all possible, but I'll use C# if I have to, and Java as a last resort.

How can I do this?
0
Free Tool: Path Explorer
LVL 12
Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

delete first 2 minutes of audio .aac file

Is there any software on windows 10 desktop that would allow me to do this to .aac file

Not looking to record audio/video.
Just a simple program to delete a small amount of audio (no video)
0
Hello

I was wondering if they is a media player that support multi instances which I can open each instance with a different settings.
What I am trying to do is to open for example VLC player over and over but each time with a different audio playback device - but it  always opens it with the last saved settings...Tried some more players and they work the same

Is there a player that support this? or is there a parameter to define maybe via command line to open each instance with a different audio setting?

Thanks
0
Hello

I have a question regarding multiple audio steaming form a single PC.

We have Digital Signage set up which is working with Monitor Anywhere software. Till now we have displayed only static material on 20 monitors which are connected to 2 workstations – one per each floor.
And now our marking tem a would like us to start displaying promotional videos which require sound. Monitor Anywhere support are recommending us to download and buy Virtual Audio Cable  via their site:
http://new.monitorsanywhere.com/product/virtual-audio-cable/
But according to them, It will only steam a single audio channel on all 20 screens. But…we need it to steam multiple audio channels over multiple screens – each screen has its own playlist…

Can VAC do that? Is that possible? Is there a different solution for that?

Thanks
0
We use a Sony Handycam camcorder to record amateur sports team matches.

We have been using the software that has come with this camcorder called PlayMemories Home to merge these videos together.

This was done on a Windows 10 PC.

The problem is that we have experienced a lot of problems trying to merge videos together using the PlayMemories Home software.

This software does not seem to work with merging videos if the formats of videos are different.

What would you recommend as a better product than the Sony PlayMemories Home software for merging videos.

Thanks,
Robbie
0
Hello Experts!!

I am in the need of creating an automatic process that automatically extracts the audio of an 60 minute long MP4 video stored in a folder, converts it to AAC format and then stores it in blocks of 5 minutes.

I wonder if there is an already-existing tool that I could implement to automate this process?

Thanks a lot.
0
what is the best audio editing software
I have an audio file that has multiple people speaking on it.
I want to reduce the sound of one/2 persons and enhance  the voice of other person. it looks there is some hiss sound and some kind of noise. I also want to remove it.

in short I could say.. I a looking for a software that has the capability to split multiple sounds edit/enhance them individually and then save it.  

is that possible???
0
I have tried to convert my mix cds to mp3 without any breaks between the crossfaded tracks.  Each time I try it there is a slight pause where the tracks blends in.  This is very disturbing since I created the mix cds to have a continuous flow of uninterupted music.  Is there any way for me to create a mix mp3 file?
0
I am actually trying to implement text-to-speech conversion in Salesforce by hitting a third-party api.

When i send the request through Postman, i get back the proper response in .wav format. However, I'm not being able to handle this reponse programatically in salesforce end, as I am not able to store the response in any audio object.

Any assistance would be greatly appreciated.

Thanks in advance.
Abhishek.
0
please contact me there seems to be an equation for tuning it looks like if pitch shifting is done right using the equation even in equal temperament it will be fine
0
Learn to develop an Android App
LVL 12
Learn to develop an Android App

Want to increase your earning potential in 2018? Pad your resume with app building experience. Learn how with this hands-on course.

I have finally managed to get my Cool Edit pro up and working on Windows 10. I am downloading directly from a recording desk via a USB interface. All the settings are the same as on my other computer and the device setting box on the program is recognising the USB device. But nothing is being recorded. Any ideas?
0
I use Lenovo laptop windows 10, I downloaded Itunes to this laptop, the problem is Itunes music that is transfered to the usb won't play in a usb player please help, thank you
0
hi, Whatsapp archives audio attachments as .opus files. I have saved them to a dropbox. Surely there is a way to play them on a browser without going through a complicated series of conversion steps. I need this to work for non-techies who can click on a link but that's as far as I expect the user involvement to go. I can generate the links if there is a site that will stream the opus files.

Can anyone suggest a site? Something like URL WWW.CLEVEROPUSSTREAMINGSITE.COM?MYOPUS=MYDROPBOXLINK

Thanks
0
Hi, Appreciate it very much if anyone can help.

I want to burn a few songs to a CD for a friend who is in a hospital.  But tried window media player of microsoft , Express burn of NCH Software and a few other burning software, have not been successful.  

Express burn's error message is sense data 03 73 03, don't remember what window media player's error message is.  

I am not sure what is wrong.  I used a disc which is Sony CD-R 700MB.  

Is there anyone having any idea of what is wrong?  Very frustrated at the moment.  Thanks a lot.
0
I just realized I have set up 2 different Itunes accounts under 2 different email addresses I have. I am trying to add music to a 2nd generation ipod shuffle but it seems it will only sync with one library or the other, wiping out all music under my 2nd account. How do I merge the two libraries?
0
doing research for a online  free or subscription music streaming service:

requirements:

must be able to upload my personal collection of 50k songs
must be  able to access library in the car (ipod, cellphone)
must be able to access on computer
must be able to migrate library from ipod
must be cloud
must be secure
must offer backup & restore


would be nice to have full step-step instructions
0
I want to create a video editor software for my graduation project. But I first need to learn about digital video principles, what are codecs, containers, formats , mono vs stereo , resolution , sound processing ....etc (to use ffmpeg / mlt framework properly and know what I'm doing and how they do that when I use them)
The software should be able to transcode , edit , add effects and most other functions that are found in professional video editors.
What kind of knowledge should I have ? what to read and what not to read?

I bought many books about this topic , but they are talking about irrelevant stuffs , like pal & ntsc for TV and cables , a lot of math ..etc

Please let me know about the topics I need to read , books to get , any online references
0

Digital Audio

Digital audio is technology that can be used to record, store, generate, manipulate, and reproduce sound using audio signals encoded in digital form. Following significant advances in technology, digital rapidly replaced analog audio technology in most areas. Digital audio systems may include compression, storage, processing and transmission components. It is important to distinguish between the audio coding format, the codec performing the encoding and decoding of the raw audio data, and the container file. Common file formats include .wav, .aiff, .au, .m4a, .mp3, .wma, .ra and .raw.