Questions tagged [aac]

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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24 views

Audio sounds muffled/muted - but not all of it

I'm viewing an MP4 file with AAC audio, and am experiencing something weird with the audio: I do hear audio; but while the background music seems to sound ok, the characters' speech and other audio ...
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0answers
24 views

Why am I getting this error “Unknown encoder 'libfdk_aac'” [duplicate]

I want to convert .ac3, .eac3, .aac, .m4a or any other similar audio file to a HE-AAC 6 channel 192/224/384kbps file I am using this command to convert audio: ffmpeg -i input.m4a -c:a libfdk_aac -...
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1answer
73 views

Why am I getting this error when converting m4a file? “Unknown encoder 'libfdk_aac'”

I am on Windows and am using the latest March 20, 2021 version of FFmpeg: ffmpeg-4.3.2-2021-02-27-essentials_build.zip When I use this command to try and convert audio: ffmpeg -i input.m4a -c:a ...
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1answer
30 views

How to convert audio to HE-AAC?

How to convert an .eac3, .ac3, .aac or any similar audio file to HE-AAC? (6 channel-192/224/244kbps)
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1answer
31 views

Why does FFmpeg default to libvorbis?

Despite having used it for years, I very recently learnt (or maybe relearnt) that FFmpeg encodes by default even when not asked to, unless the streams are explicitly passed through with -c copy. This ...
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0answers
65 views

FFMPEG - stream RTSP feed to YouTube with AAC audio

From HIK Vision camera I get G.711ulaw audio. Need to help to convert the audio to AAC or any YouTube supported audio so that I can stream my IP camera to YouTube live. Thanks in advance. FFMPEG ...
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0answers
23 views

How to use Ffmpeg to downmix 5.1 EAC3 to stereo AAC with Dolby Pro Logic II, while keeping the 5.1 audio track? [duplicate]

I'm creating audio tracks from movies that can be direct played on Roku and iOS devices. Handbrake can downmix 5.1 audio to stereo with Pro Logic II matrix encoding, but it cannot re-encode just the ...
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0answers
32 views

Audio is scrambled up when using ffmpeg concat demuxer

I am using ffmpeg's concat demuxer to join different mp4 videos. First I have reencoded all videos with the following command: ffmpeg -i "${file}" -c:v libx264 -c:a aac "${out}" ...
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1answer
113 views

FFmpeg AAC audio copy

I tried to convert some transport stream files to MP4 files, keeping only the original audio. For most streams this works fine, but for streams containing aac audio this seems an issue. q1: why this ...
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1answer
199 views

convert mp3 audio to aac m4a audio

It may be easy, but I'm new to ffmpeg and struggle with converting an mp3 audio to an aac audio file with .m4a file extension using ffmpeg on the command line (Win10). input: Stream #0:0: Audio: mp3, ...
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151 views

Why do different devices and OSes decode the same AAC audio differently?

Depending on the device and OS I use to view this video, the stereo position of various audio elements change. For example, the piano and the person speaking at the beginning are either exclusively on ...
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0answers
15 views

working with atoms - audio is silent after adjusting STCO offsets

Edit: I fixed the problem soon after posting this. It was related to something else entirely. My apologies. Background: I'm working on a Swift library for modifying audiobook chapters and metadata, ...
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0answers
133 views

FFMpeg, libx264, ac3, aac license inquiry

I am Gun a Korean developer. We will develop an encoder to be used by the company using FFMpeg. It will be installed on a server to encode contents in 30 seconds or less, and there are no plans to ...
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1answer
115 views

Best sample rate AAC 5.1 384Kbits?

I have a movie with AC3 5.1 audio with 48khz of sample rate and change to AAC using libfdk_aac codec. I don't know if use the same sample rate or set to 44.1khz. In the libfdk_aac documentation the ...
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2answers
2k views

Audio is not in sync after re-encoding with ffmpeg of video and changing audio from eac3 to aac

Recently I did a re-encode using ffmpeg and encountered an inaudible but waveform visible audio desynchronization in the process. Source information of MKV file and audio stream: Mediainfo shows a ...
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2answers
897 views

ffmpeg: How do I re-encode a video to H.264 video and AAC audio?

I'm trying to re-encode a video produced with "TechSmith Screen Capture Codec" in WinUAE to use H.264 video and AAC audio, with the latest "ffmpeg" (20200510-fc99a24) 64-bit, but when I use the ...
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1answer
1k views

No sound on certain mp4 videos (audio codec: MPEG-4 AAC) in Windows 10 that work in Android (with earphones only) & Linux

Update: in Android there is only sound on these videos when I have earphones plugged in. No sound will play on my phone's speakers. The audio works on a set of mp4 videos when I play them in Ubuntu ...
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1answer
192 views

ffmpeg take channels 7+8 and make a stereo

I have a 8 audio track mov file which I want to encode to mp4 using ffmpeg BUT take the tracks 7+8 and put them as stereo with 320k and 48KHz to that mp4. My line is this: ffmpeg -i %source% -map 0:0 ...
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2answers
213 views

Converting AC3 audio to AAC in Audacity

I have a number of Music Videos I am converting from DVD to MP4. Unfortunately I find the audio levels are all different. It is easy enough to get similar audio leves by using Audacity but would ...
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1answer
47 views

Bundling AAC-LD with MPEG2-TS

While using a proprietary SDK I had the following observations: 1) Could hear audio (AAC-LD) and see video (H.264) during the playback of MP4 video file. 2) Could not hear audio (AAC-LD) but could ...
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1answer
625 views

Type of audio codec being played in VLC

Is there a way in VLC player to ascertain the audio codec being used while playing a live stream via URL ? I am able to see "Codec: MPEG AAC Audio" in Codec Info but I want to see what type of AAC is ...
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0answers
120 views

Why is the libvo-aacenc / libvo_aacenc not found?

When using this https://libav.org/releases/libav-12.3.tar.gz library and running in the folder: "./configure --enable-static --enable-version3 --enable-libvo-aacenc" the error "ERROR libvo_aacenc not ...
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1answer
692 views

FFmpeg drops the Album Art

Everytime I encode my songs to lossy formats, the output file keeps the tags (title, artist, album, etc...), but drops the album art. I tried to encode to any lossy format, including AAC, OGG and ...
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1answer
589 views

Can MP3 contain AAC?

Can the container format MP3 contain an audio with a codec of ACC? I know that the MP3 container format can contain audio with a codec or MP3 (MP3 is a container and a codec); I thought that was the ...
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1answer
112 views

How do I cancel out identical part of two audio files in Wavepad? (probably using phase difference?)

Let's say I have two similar audio files in different format (such as MP3 and AAC) from the same master (CD audio or WAV file) and I want to find some differences of quality between the two files. (to ...
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1answer
41 views

What two types of lossy audio are the best to compare quality and efficiency? [duplicate]

I'm planning to do a detailed research about comparing and contrasting two lossy audio type formats. However, now I'm struggling to determine the two types which I can do a lot of experiments and ...
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1answer
549 views

ffmpeg-normalize output bitrate much larger than input bitrate

I am using the ffmpeg-normalize tool to normalize the relative volume of some AAC (extension .m4a) audio files. Often the output file is much larger than the input one, but I thought ffmpeg by default ...
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1answer
3k views

VBR encoding with ffmpeg native AAC codec

I installed ffmpeg v4 from the Ubuntu launchpad ppa:jonathonf/ffmpeg-4 repository but it does not have the libfdk_aac codec included : $ ffmpeg -version | grep -i aac $ EDIT 1: $ ffmpeg -encoders | ...
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1answer
800 views

The number of audio channels in a given mp4 with Mediainfo

I am trying to find the number of channels in a given .mp4 file. I run mediainfo, but it shows it as 8! Basically it should either be a 2 channel, or 5.1 showing as 6. And many of my files look like ...
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1answer
662 views

2.1 downmix with libfdk_aac using ffmpeg

I have several input media files I'd like to process. The input audio stream of each file is encoded in ac-3 with a 5.1 channel layout (back or side) at 384kbps. The objective is for the target media ...
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2answers
5k views

Fraunhofer FDK AAC in FFmpeg

The FFmpeg AAC guide says, Fraunhofer FDK AAC codec library is currently the highest-quality AAC encoder available with ffmpeg. Pre-built ffmpeg does not support it. This can be resolved by ...
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1answer
75 views

Why does AAC render grainy output on my system?

I have two different systems (Windows 10 LTSB and Windows Server 2012) running the same version of ffmpeg and I'm running the following command in both of them: ffmpeg -i input.mp3 -vn -c:a aac -b:a ...
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0answers
441 views

how to prevent creating of menu/chapter?

I'm using this simple command for re-encoding my audio tracks ffmpeg.exe -i "SOURCE.mp4" -acodec pcm_f32le -f wav - | neroAacEnc.exe -ignorelength -q 1 -cbr 80000 -lc -if - -of "out.aac" and I ...
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3answers
11k views

Recommended settings to convert Opus to AAC

I am downloading some music from Youtube, and it seems that in most cases (popular videos), the best quality audio is an opus file. I know that (1) Opus is the newest and more efficient codec, and (2)...
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1answer
1k views

Ubuntu 16.04 compiling FFMPEG with libfaac

I tried in different ways by reading various documents. I was not able to compile FFMPEG with the libfacc library but only with fdk_aac. https://gist.github.com/teocci/...
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0answers
362 views

delay in audio sync after converting ac3 to aac

I have a MKV video consist of a video and an audio of duration 10 minutes, after using ffmpeg to extract ac3 to aac audio, its duration became 10:50, which lead to audio out of sync with the video ...
2
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1answer
267 views

HE AACv2 Audio profile on MediaInfo

I have a SDI input encoder with audio configuration as Coding : AAC/HE-AAC Coding Mode : MPEG-4 HE AAC v2 Mode : Stereo (2/0) Sameple Rate : 48KHz ES Bitrate : 64Kbps Transport Format : ADTS And, ...
2
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1answer
9k views

5.1 audio over SPDIF on Windows 10?

I bought a Xonar DGX to hook it up to my Sony 5.1 surround system with SPDIF. Windows 10 says the SPDIF port only supports stereo and when I start the sound test it plays only sounds on FL and FR. In ...
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1answer
1k views

ffmpeg do not write metadata to the aac

My input: ffmpeg -i input.ogg -metadata Album='Vitaly' output.aac Returned: ffmpeg version 3.3.4-static http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2017 the FFmpeg developers ...
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1answer
591 views

FFmpeg: spoken audio from ogg vorbis to aac VBR: modes 1-5 have zero effect

ffprobe about my input: Duration: 00:02:50.54, start: 0.000000, bitrate: 40 kb/s Stream #0:0: Audio: vorbis, 22050 Hz, mono, fltp, 35 kb/s Filesize: 834K I use this command to convert this ...
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1answer
1k views

Unable to create aac/mp3 cbr 256k using ffmpeg

I am using following commands to make aac/mp3 files with 256kbps bitrate and constant bitrate mode. For aac: ffmpeg -i test.wav -b:a 256k -y test.aac For mp3: ffmpeg -i test.wav -b:a 256k -y test....
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1answer
528 views

Specifying different aac profiles for different audio streams in ffmpeg

I'm trying to take a video with two audio streams and compress the first one in stereo at 48 kbps with AAC HEv2 encoding, with the second in mono at 40 kbps using HEv1. My code is essentially as ...
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1answer
51 views

bash script variables not proper

I updated it a little bit, but I'm still not getting the results I should be getting: #!/bin/bash find "$1" -type f | while read filename do videoCodec=$(ffprobe -v error -select_streams v:0 -...
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1answer
398 views

Is it possible to write ApeV2 tags with FFMPEG in AAC format

I am currently developing an application that allow user to convert formats between each others. To convert the audio files I use ffmpeg. I have a problem with the aac format that doesn't have any ...
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1answer
1k views

A “proper” way to extract AAC audio from an MP4 file?

I use Linux (Kubuntu 16.04), and I have some .MP4 files with audio tracks, which I want to extract, save as .AAC/.M4A files and tag. Now, I've been doing the extraction using MP4Box -raw $...
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2answers
1k views

converting to the same format many times - how much quality will I lose?

Almost a decade ago, I converted all my mp3 files higher than CBR 192 kbps to exactly CBR 192 kbps. This is because I can no longer here any difference between CBR 192 and CBR 320 (using and ABX test),...
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1answer
778 views

Maximising efficiency of my M4A music playlist

Reading this answer here and questions like: What lossy audio formats are more (or less) "efficient"? Are there any perceptible differences between the sound quality of 192 versus 320 kbps ...
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1answer
8k views

ffmpeg FLAC to AAC encoding

I wanted to make sure that I'm not shooting myself in the foot and ask about this. So currently I have an audio file in a .mkv container that looks like this Audio: FLAC (framed) 48000Hz stereo ...
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1answer
923 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 ...
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1answer
517 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 ...