Advanced Audio Coding (AAC) is an encoding scheme for lossy compression of digital audio designed to be the successor of the MP3 format.

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16
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2answers
12k views

How to extract an audio track from an MP4 video file on Windows?

Having an MP4 video file I'd like to get just the audio track of it. What makes my question different from the others is that I don't want to convert it (like to MP3 or anything) - I'd prefer to keep ...
12
votes
9answers
54k views

What is the best file format/bit rate to rip tracks from a CD into iTunes? [closed]

I know it sounds subjective but its not meant to be. I am very new to ripping CD's using iTunes, and I'm confused over the different formats available. I have read Wikipedia regarding the AAC and ...
9
votes
1answer
16k views

FFmpeg command to convert MP3 to AAC

I can issue this command: ffmpeg -i input.mp3 -acodec alac -ab 128k -ar 48000 -ac 2 -y output.m4a to create a m4a file. But when I issue this command ffmpeg -i input.mp3 -acodec alac -ab 128k ...
7
votes
7answers
14k views

How to decode AAC (.m4a) audio files into WAV?

How would you convert (decode) AAC files into WAV format? (Or, if you prefer, how to decode & re-encode them into MP3 or Ogg Vorbis? But WAV is sufficient as I already have good tools for WAV ➔ ...
7
votes
3answers
11k views

How to use ffmpeg to add metadata to an AAC file without reencoding?

I'm using ffmpeg to extract just the audio stream from a video file: ffmpeg -i video.mp4 -vn -acodec copy audio.aac This produces a clean audio file but without any metadata. To add metadata, ...
5
votes
1answer
4k views

How do I convert the format of an audio track inside an MP4 video?

I have an MP4 File with an AVC video track and an MP3 (not AAC) audio track. Video: MPEG4 Video (H264) 1920x1080 [Video] Audio: MPEG Audio 44100Hz stereo 192kbps [Audio] While some video players ...
4
votes
1answer
1k views

What lossy audio formats are more (or less) “efficient”?

This question is related to the answers I got to this question. The bitrate-efficient format (see the question's most voted answers and their comments thereunder) would be one that assures a good ...
4
votes
3answers
368 views

How to convert a library of DRM'd iTunes AAC songs to unprotected mp3s for free?

How to convert a library of DRM'd iTunes ACC songs to unprotected mp3s for free?
4
votes
5answers
3k views

Extract audio aac from mp4

Is there a command line tool for Windows to extract audio aac from mp4 ?
3
votes
2answers
11k views

Convert MKV with DTS sound to MP4 video with AAC or AC3 audio

I've got a 4.3 GB 720p movie and want to convert this MKV with DTS sound to MP4 video with AAC or AC3 audio. I sometimes got "ffmpeg: unrecognized option '-c:v'" and "aac unrecognized" and other ...
3
votes
1answer
518 views

No Audio on Windows Media PLayer When Converting Uncompressed Video to MP4 with AAC using ffmpeg

I'm having problems converting uncompressed video to mp4 format using AAC for the audio. I don't get any errors, but no audio plays with the video in the output files in Windows Media PLayer (other ...
3
votes
1answer
716 views

What does the “cutoff” option do in FFmpeg?

I am encoding some FLAC files into AAC and I came across the -cutoff option. I do not see this option in the documentation, however I did find it in the help $ ffmpeg -v warning -h full | grep ...
3
votes
2answers
2k views

How to play MP4 file with AAC 5.1 through S/PDIF

I have a laptop with Windows 7 x64 and a Sound Blaster X-Fi Surround 5.1 Pro. I connect the HDMI output of the notebook to my LCD-TV and the external soundcard to my home-theater receiver through an ...
3
votes
1answer
5k views

How to verify FLAC files against the AccurateRip database?

I've been ripping my CD's to CUE+FLAC so that I get image files that allow me to replicate the actual CD. This serves me as a backup and as an easy access to the "media" if I need to re-rip the CD's ...
3
votes
1answer
829 views

Downmix from 5.1 Surround to two channel stereo using avconv

I have a .wmv with the audio codec of wmapro, which my target video player chokes on. I am generally in the process to "standardise" my collection to x264/aac (as this works fine on all my devices), ...
3
votes
0answers
4k views

How to convert a mpeg4-aac video to mpeg-ts using MEncoder?

I know this can be done using FFMpeg and I have done it. The only problem here was that FFMpeg actually tries to "encode" the file while converting to mpeg-ts which I don't want. i.e. I just want to ...
2
votes
5answers
13k views

iTunes: Burn an MP3 CD when I only have AAC files?

Is there a way to burn an MP3 CD when iTunes only contains (unprotected) AAC files purchased from the iTunes store? There isn't an option directly in iTunes to convert AAC -> MP3 like there is for ...
2
votes
1answer
2k views

Converting MP3 to AAC and outputting to stdout

ffmpeg.exe -i s.mp3 -f aac - This is the command I run but it doesn't recognize the format AAC. Requested output format 'aac' is not a suitable output format pipe:: Invalid argument However when ...
2
votes
2answers
7k views

AAC Sample Rate and Bit Rate for High Quality Audio?

What are the AAC Sample Rate and Bit Rate settings to set in order to encode an audio track with a quality comparable to MP3 320kbps? I need to backup a DVD movie, the default settings for AAC are ...
2
votes
4answers
11k views

How can I import h.264 encoded MOV files into windows movie maker?

I have a couple of digital camcorders that output .MOV files encoded in h.264 video/AAC audio. They won't load into Windows Movie Maker or Windows Media Player - I guess I need to install some codecs. ...
2
votes
1answer
132 views

Does any economically-feasible publicly available software compare audio files to determine if they are dupes?

In the vein of this question http://unix.stackexchange.com/questions/3037/is-there-an-easy-way-to-replace-duplicate-files-with-hardlinks is there any software that will automatically parse a library ...
2
votes
1answer
375 views

Time of splitting and encoding video with ffmpeg increases exponentially

I'm trying to split a video by subtitles and encode into .mp4(h.264/aac) using ffmpeg, but it takes so much time! First pieces of video are splited and encoded really fast, but for each iteration time ...
2
votes
1answer
203 views

Audio export settings used by QuickTime Player on OS X Mavericks

Can someone please post, in as much detail as possible, which AAC audio profile and bitrate settings Quicktime utilizes during an export on OS X Mavericks (10.9) when choosing File > Export > Audio ...
2
votes
0answers
92 views

How can I set current URL's and track names in M4A (AAC) songs?

I was listening to a mixset from Moby in iTunes today and noticed a few cool things about this M4A file which I would really like to know how to do on my own. The file has some type of embedded URL, ...
1
vote
2answers
11k views

HLS video segmenting complications. How to create a transport stream with ffmpeg

I have h264 videos, and currently we're using Apple's HTTP Video Streaming tools and mediafilesegmenter to segment these files. What I need to do is to switch to alternative segmenter based on this ...
1
vote
2answers
302 views

AAC 256kbit to MP3 320kbit conversion. I know it's lossy, but how?

Has anyone ever transcoded music from a high-quality aac to an mp3 (or vice-versa). The internet is full of people who say this should never be done, but apart from the theoretical standpoint that you ...
1
vote
3answers
7k views

How does iTunes 128 kbps AAC compares with LAME MP3 (-V 2, or -preset fast standard)?

I've been ripping my CD's to MP3 using LAME, with -preset fast standar (or -V 2), since audio listening tests find that LAME with these settings is transparent and as good as top quality Ogg Vorbis or ...
1
vote
1answer
4k views

Convert mp3 to wav using FFmpeg for VBR

What command should I use to convert a mp3 file to wav whose bitrate is variable. Or better how would I know whether that source audio is fixed bitrate or variable?
1
vote
1answer
513 views

Small pieces of video split by ffmpeg are not playing or playing with artifacts

I'm trying to cut a video file into small parts (0.5-5s) and encode these parts to h.264/aac with ffmpeg. I'm using this command: ffmpeg -i 1.avi -ss 00:05:00 -t 00:00:01,50 -vcodec libx264 -threads ...
1
vote
1answer
490 views

Where can I get AA or AAX file format?

I need to test a AA and AAX file format for iphone testing. I tried google searching with filetype:aax. But I could't find it easily. Where do I find these samples?
1
vote
1answer
641 views

Automatic adaptive gain normalization

How may I normalize a (voice) audio mp3 or aac file with no loss, having the gain rised as much as possible (mitigating distortion using a compressor), so in a long conversation people that speak ...
1
vote
1answer
140 views

How can I repair a broken 3GP/MP4 file without a moov header?

I was recording audio two days ago and my phone suddenly died while doing so. I used MP4repair and a short clip of sound could be heard and they would be charging $80 to recover it. I thought it was ...
1
vote
1answer
509 views

afconvert: Difference between AAC formats: 'aac ' 'aace' 'aacf' 'aach' 'aacl' 'aacp' 'alac' 'paac'

When using afconvert for AAC output, I find little documentation on the format variants under the m4af category: 'aac', 'aace', 'aacf', 'aach', 'aacl', 'aacp', 'alac', 'paac'. I can guess probably ...
1
vote
2answers
2k views

Getting iTunes to play third party AAC files

I have a library filled with some old MP3 files and I'm in the process of changing them all to AAC for the better sound quality. Obviously I can't just create AAC versions of the files I already have ...
1
vote
1answer
4k views

FFMPEG: AC3 to AAC conversion issues

Ok, this one has me scratching my head - and being a n00b isn't helping. In short, I had a script which I had perfected to covert MKV video to MP4. However, my Ubuntu 10.10 box bit the dust and ...
1
vote
3answers
802 views

trouble installing nero AAC on fedora-13

(i've been asking questions like this a lot lately, eh?) I'm unable/unsure how to install nero AAC on my fedora-13 box. I've downloaded the zip archive and extracted it. I see a linux directory ...
1
vote
1answer
544 views

Avconv Can not resample 6 channels

I'm getting a message, that it cannot resample 6 channels into 2 channel audio. This is the command i'm using to convert into h.264+aac: avconv -i ...
1
vote
2answers
336 views

How to use NeroAacEnc in Terminal on Mountain Lion

How can I encode audio using the amazing NeroAacEnc? Is there a way to compile it for Mac OS or is Wine the only solution? I am trying to combine it with x264 through ffmpeg for HD video transcoding. ...
1
vote
2answers
2k views

Media file repair tool

I have an incomplete MP4 file. It contains audio only, in AAC. Is there any tool that would fix the file so I can play the partial file?
1
vote
1answer
81 views

Is there any problem opening 300MB+ audio files on Windows?

I just recorded about 6 hours of AAC streaming into a file, resulting in 300 MB approximately. The file doesn't play. I wonder if there was any problem with the file format and content, or it is just ...
1
vote
3answers
2k views

Convert video files for Maemo (Nokia N900) using ffmpeg/mencoder

I'm a newbie in video encoding so I'm looking for some expert advice. I'm looking to transcode media files with ffmpeg or mencoder (or something other) on Ubuntu for my Nokia N900 running Maemo. I'd ...
1
vote
0answers
117 views

Mixed results writing M4A metadata

Given this file I am having mixed results writing metadata. For example this command ffmpeg -i confetti.mp4 -c copy -f adts - | ffmpeg -i - -c copy -bsf aac_adtstoasc -movflags faststart \ ...
1
vote
0answers
1k views

Failed to convert a wmv file to mp4 with ffmpeg

i need a help with this command FFMPEG COMMAND: ffmpeg -y -i /input.wmv -vcodec libx264 -acodec libfaac -ac 2 -bufsize 20M -sameq -f mp4 /output.mp4 Output: ffmpeg version 1.0 Copyright (c) ...
1
vote
1answer
588 views

How to merge AAC audio stream and H.264 video, with increasing delay on audio?

I have an H.264 video stream and an AAC audio stream that are to be multiplexed into an MKV file. I've got this going mostly fine using mkvmerge on Linux, however for each set of streams I find that ...
0
votes
1answer
654 views

How to determine AAC bit depth

With a wav file for example you can easily distinguish between bit depths 24-bit Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s32, 2116 kb/s 16-bit ...
0
votes
1answer
467 views

AAC converted from MP3 (FFmpeg) results in bigger size

I'm on Windows x64 converting MP3 file to AAC using FFmpeg. I tried these commands: ffmpeg -i file.mp3 -acodec aac -strict -2 file.aac ffmpeg -i file.mp3 -c:a libvo_aacenc file.aac Both commands ...
0
votes
1answer
970 views

How does AACplus v2 perform in comparison to AAC? [closed]

Which of these audio codecs provides better quality? I want to encode my audio files to lower lower bitrate and maximum quality.
0
votes
2answers
232 views

Linking to aac audio files is returning a 404

I have a lot of audio backed up on 1&1 (a web host), as I have a ridiculously large amount of cheap space left over after my websites. I uploaded these through Wise-FTP directly to my webspace ...
0
votes
3answers
746 views

What tools similar to Tag&Rename exist?

I've got a media library consisting of a set of roughly 8000 MP3 (purchased from Amazon MP3), AAC (purchased from the iTunes Music Store - Unencrypted), and FLAC (ripped from my own physical disks) ...
0
votes
3answers
2k views

What software do you use to encode movies below 700mb in the MKV format?

What software do you use for encoding video files. Probably with the following specifications: Format : Matroska File size : around 300 to 600 mb Duration : 1h 30m~ Video ...