Questions tagged [aac-m4a]

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I can choose one of these formats: OPUS 152 kbit/s vs AAC 128 kbit/s vs M4A 128 kbit/s. Which one is better?

Here's more info of the same file but different formats, using ffprobe and file command of Linux: OPUS (size 2.9 MB): Command: ffprobe -i "OPUS_AUDIO.opus" Output: Input #0, ogg, from '...
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0 answers
134 views

Opus adds "unexistent" frequencies to the audio spectrum?

I admit that I am more than a newbie in terms of audio compression and everything that surrounds that world, but I was doing some research on how audio codecs work and how they actually cut off ...
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0 answers
65 views

getting a wav file from a mic while also using it to record a zoom call

I have a project in which I'll be using a Blue Yeti X (or something like it, podcasting type mic) as a mic on a macOS computer and recording people on it using Zoom. I want linked audio and video ...
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0 answers
364 views

How do I fix an m4a file that that has no sound beyond the 1st minute? [duplicate]

Now sure how these files got corrupted, they were recorded using the default Android Sound Recorder app. There is no sound beyond the first minute but the file is large showing there is info recorded ...
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1 vote
1 answer
399 views

Perceptual Noise Substitution and AAC

What is Perceptual Noise Substitution and How it is used in AAC?
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1 answer
185 views

Any reason to use MP3 over AAC?

All information I found online indicates that AAC is superior to MP3 in every aspect, having better sound quality at lower bitrates/file sizes etc. So is there any reason to ever use MP3 instead of ...
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-1 votes
1 answer
49 views

Do Opus And AAC Use Artistic License To Improve Sound Quality By Sacrificing Accuracy?

I was reading a forum thread the other day and came across a post which claims that unlike MP3, other codecs such as Opus and AAC "[invent] audio data that's not accurate to the source" by "[...
1 vote
1 answer
844 views

Audio file in shorter in m4a than in PCM

I recorded a voice memo that shows a length of 10:22 in iTunes. I convert it to PCM with ffmpeg -i input.m4a -c:a pcm_s16le -f s16le temp.pcm and then back to m4a with ffmpeg -f s16le -i temp.pcm -...
0 votes
3 answers
6k views

mp4 file has no sound

I recorded an mp4 file with 41mins, when i open it it shows the size and duration and plays through the file but doesn't have any sound. Does anyone know a way how to try and repair this or is this ...
1 vote
1 answer
173 views

Is lossy encoding supposed to produce higher signal level peaks than those present in the original?

I just noticed a couple of files I converted from FLAC to M4A (AAC) with Selene Media Encoder + Nero AAC now have substantial clipping and distortion in them even though the original FLAC had none and ...
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1 vote
3 answers
615 views

Which format for radio station to choose in Shoutcast?

In Shoutcast there is option to choose will radio station run mp3 or aac, and i am not sure which one is better option. Please recommend. What i read is that aac can provide same quality on lower kbps,...
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2 votes
1 answer
5k views

AAC m4a file corrupted while recording. Can anyone help me recover it? [duplicate]

Recorded an important voice memo on iPhone application. After the recording was stopped, the phone's battery died and AAC file was corrupted. It is 8mb and should play for roughly 45 minutes but the ...
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1 vote
6 answers
5k views

Does converting an mp3 format audio file to m4a format makes audio quality better?

Does converting an mp3 format audio file to m4a format makes audio quality better ? I was just wondering if mp3 is lossy. How it can generate lossless m4a file after conversion. I know mp3 can be ...
19 votes
3 answers
90k views

How to recover audio from an incomplete or corrupted AAC/m4a file

I recorded an 85-minute AAC/m4a file using Notability on my iPad. This app has always worked well before but for some reason there was a problem this time. The relevant file shows up as having 21MB (...
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2 votes
1 answer
4k views

When I read "MPEG-4 AAC", does this mean 'AAC', 'AAC+ Version 1', or 'AAC+ Version 2'?

I'm encoding .3gp videos. Instructions say, under audio codec: "MPEG-4 AAC". On audio settings, I can choose between "AAC", "AAC+ Version 1" and "AAC+ Version 2". I'm lost. Can anyone enlighten me?
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3 votes
1 answer
634 views

GarageBand: Create Apple Loop from m4a recorded piano files?

How can I import m4a files as Apple Loops? I love the concept of the loops but I can't always have my main pianist next to me recording and then storing it as Apple Loops.
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