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

learn more… | top users | synonyms

0
votes
1answer
30 views

ffmpeg flac to aac (libdfdk_aac) missing metadata

I want to convert an album from flac to aac. After converting the aac file is missing all metadata from the original flac file. I've already tried to convert it with the -map_metadata 0 argument My ...
0
votes
1answer
29 views

Opening FLV AAC stream in VLC

When I run vlc from the command line and pass it the url of a stream I want to listen to, it works: $ vlc http://14143.live.streamtheworld.com/CJMOFMAAC But when I try to open this url from within ...
13
votes
2answers
29k 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 -...
6
votes
2answers
18k 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?
0
votes
1answer
86 views

Convert m4a to aac without quality loss?

I wanna use a program on an .m4a file, but the program can't handle .m4a. It can handle .aac, however, and the codec of the file is MPEG-4 AAC. Is there a way to convert to .aac (and preferably ...
1
vote
1answer
74 views

FFMPEG - How to keep metadata while transcoding

Ffmpeg newbie here. I put together a command line that takes anything put into it and outputs audio in aac: for %%a in ("*.*") do ffmpeg -i "%%a" -vn -c:a aac -b:a 320k "Output\%%~na.aac" pause ...
3
votes
2answers
7k views

Converting Audio to AAC using ffmpeg

I have the following setup for ffmpeg ffmpeg version N-54790-g1816f55-syslint Copyright (c) 2000-2013 the FFmpeg developers built on Jul 17 2013 21:34:32 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4....
4
votes
3answers
21k 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 ...
0
votes
1answer
86 views

Batch extracting multiple .aac tracks from an .mp4 using ffmpeg?

How do I create a ffmpeg .bat file that will let me drop in .mp4 file(s) and extract multiple .aac tracks without any converting or transcoding taking place ? I do know that there will always be 3 ....
0
votes
0answers
34 views

Rhythmbox, Banshee and Clementine do not import ADTS aac file

The file is an aac file Duration: 00:05:33.98, bitrate: 161 kb/s Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 161 kb/s Clementine, rhythmbox and banshee refuse to open this file. However, ...
0
votes
0answers
61 views

Cannot find the audio bitrate of FLV video

I use ffprobe to get info about video, which i can use for encoding to mp4. And recently i faced with the issue. The issue is input video has audio, but output video is mute. I used php script to get ...
2
votes
4answers
12k 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. ...
1
vote
3answers
16k 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 ...
2
votes
1answer
1k 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 ...
3
votes
5answers
18k 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 ...
8
votes
5answers
6k views

Extract audio aac from mp4

Is there a command line tool for Windows to extract audio aac from mp4 ?
0
votes
2answers
502 views

(FFMPEG) Re-encode audio using qaac.exe

I was using a script to batch re-encode audio to AAC using the libvo-aac encoder. @ECHO OFF FOR %f IN (*.mkv) DO call ffmpeg.exe -i "%f" -c:v copy -c:a libvo_aacenc -b:a 256k "%f" However since I ...
0
votes
0answers
57 views

Which audio codec is preferable to use for mp4 video?

I use standart codec for encoding and i don't like the quality of audio even if there is larger audio bitrate. ffmpeg -y -i input.avi -i watermark.png -filter_complex \"scale=-2:'min(360,ih)',overlay=...
3
votes
2answers
1k 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), ...
6
votes
1answer
1k 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 ...
1
vote
2answers
370 views

How to add metadata and cover to an audio file in Windows 8? [closed]

I am using Windows 8 have some MP3 files with the album cover embedded. I convert them to AAC (Advanced Audio Codec) format in order to gain some space. The problems is that after I converted them, ...
4
votes
2answers
8k 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 (...
0
votes
0answers
191 views

ffmpeg synchonization of libfdk_aac (or libfacc) and libx264

How to synchronize libfdk_aac and libx264 streams? ffmpeg -i pipe_libfdk_aac.fifo -i pipe_libx264.fifo -c copy -f flv flv_stream_pipe_or_rtmp.output I'm always receiving the same asych in all cases:...
0
votes
0answers
9 views

Changing the default decoder aac(native) into aac(libfdk_aac) or aac(libfaac) [duplicate]

Is is posible to change default decorder of ffmpeg? If I use ffmpeg -i pipe_video.fifo -i pipe_audio.fifo -c:v copy -f flv file.flv ffmpeg automatically changes aac(native) into (mp3)libmp3lame (!!!...
1
vote
2answers
755 views

Does ffmpeg's aac encoder need a audio bitrate?

What happens if you do not set a audio bitrate in the aac encoder ? -ab 128k Does it automaticly select the highest bitrate it can or something i am curious if i should do this or if it will be bad ...
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?
17
votes
7answers
29k 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 ➔ ...
1
vote
1answer
758 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
547 views

How to fix missing Media Foundation Microsoft AAC Audio Decoder Transform MFT Windows Server 2k8r2 sp1

I have a Windows Server 2008R2 SP1 VM that has somehow lost its Media Foundation AAC Transform. I discovered this when certain .MOVs with AAC streams were not behaving as expected. I opened TopoEdit ...
1
vote
1answer
84 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 ...
0
votes
0answers
262 views

ffmpeg -concat slowing down AAC audio files

I am concatenating six m4a files with this command ffmpeg -f concat -i audiofiles.txt -c copy all_audio_edited.m4a each file has a duration of 4 hours (24 in total) but the concatenation doesn't ...
0
votes
1answer
336 views

How to get Clementine to play AAC files (on Windows)?

I just installed the Clementine audio player. I like it, but it doesn't play my .aac files. This Ubuntu forum post suggests this is due to decoder licensing issues, and necessitates installing the ...
1
vote
0answers
159 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 \ -...
2
votes
1answer
304 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 ...
26
votes
2answers
31k 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 ...
1
vote
1answer
950 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 '...
11
votes
3answers
17k 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, ...
3
votes
2answers
3k 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
819 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 ...
0
votes
1answer
2k views

Bluetooth dongle with support for A2DP and the AAC codec

I recently bought some Sony MDR-1RBT headphones which can be used via audio cable, but also via Bluetooth. They support BT 3.0 with A2DP and use SBC or AAC as codec. Unfortunately they do not support ...
0
votes
1answer
2k views

ffmpeg .mkv to .mkv with audio .aac compression

I am trying to use ffmpeg on a .mkv video to change soundtrack quality. I would like to lower the bitrate of the audio part (to 16 kbps) without any modification of the video. Nevertheless when I use ...
4
votes
1answer
3k 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 ...
1
vote
1answer
851 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 /var/movies/Some.movie.2010.BDRip.XviD.AC3.-HQ-ViDEO....
4
votes
1answer
3k 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 ...
0
votes
1answer
495 views

Android: Listening to AAC+ files generated by StreamRipper

I ripped a ShoutCast broadcast (that streams AAC+) using StreamRipper (to listen on the phone when offline). StreamRipper (a Windows program) produced files with the "AAC" extension that play fine in ...
0
votes
1answer
2k 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
589 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
2k views

FFMPEG: how to add watermark to video?

My Platform: Ubuntu 10.10 + FFMPEG 0.5.3(I installed ffmpeg from source) I try to add Watermark to a .MOV video with FFMPEG 0.5.3 imlib2.so (Please note FFMPEG 0.6+ dont support imlib2.so, so I use ...
0
votes
0answers
185 views

Nero MP4/AAC CRC/EDC?

My MP4 library seems to become corrupt(actual file system issue) from time to time. I believe it was foobar and not the hardrive(was initial though but all tests are ok) as I saw some issue foobar in ...
1
vote
2answers
428 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.