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Questions tagged [aac]

Advanced Audio Coding (AAC) is a standardized, lossy compression and encoding scheme for digital audio. Designed to be the successor of the MP3 format, AAC generally achieves better sound quality than MP3 at similar bit rates.

Advanced Audio Coding (AAC) is a standardized, lossy compression and encoding scheme for digital audio. Designed to be the successor of the MP3 format, AAC generally achieves better sound quality than MP3 at similar bit rates.

AAC has been standardized by ISO and IEC, as part of the MPEG-2 and MPEG-4 specifications.[3][4] Part of the AAC known as High-Efficiency Advanced Audio Coding (HE-AAC) which is part of MPEG-4 Audio is also adopted into digital radio standards like DAB+ and Digital Radio Mondiale, as well as mobile television standards DVB-H and ATSC-M/H.

AAC can be encapsulated in MP4, ADTS and ADIF formats. Use as well if the question is related to AAC encapsulated in ADTS and if the question is related to AAC encapsulated in MP4 container.

More information at AAC in wikipedia

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Trying to decode/convert raw AAC data from a recording that stopped abruptly

I made a very long recording with an application in my cellphone that used AAC but its battery died after 13 hours (although it was plugged in). The file can't be played since the file structure is incorrect, but I know the information is there. The…
Gonzalo Leon
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Fuji .mov file converted by ffmpeg doesn't play in Windows Media Player

My Fuji X-T3 generates an FHD movie as a .mov with HEVC video and PPM audio. The new Media Player on Windows won't play this (without buying a codec) so I convert it to .mp4 using ffmpeg CLI (ffmpeg -i in.mov out.mp4). The resulting .mp4 file uses…
glipster
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How can I produce a 9 channel audio file encoded using AAC from 9 (mono) input files?

I'd like to create an AAC encoded audio file with an MP4 container that has a large number of channels, ideally up to 64. I'm running something like this (but with 9 files and a larger list at the start of the filter): ffmpeg -hide_banner -i 0.wav…
Thomas Bratt
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FFMpeg encoding using AAC gives 1509 bitrate

FFMpeg using the native AAC codec is always creating files with a 1509 kb/s bitrate. If I use the switch -c:a aac the FFMpeg readout says it is encoding at the default 128, but when I analyse the created file with several utilities it says 1509…
Robin
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Strange problem with reencoding AUDIO with FFMPEG from UDP Multicast MPEG TS stream

I want to re-encode the audio streams from mp2 to aac from one udp multicast MPEG TS Stream top another. I have an udp multicast mpeg ts streram with 1 video, 3 audio, and 1 subtitles streams inside. I want to change the protocol of the audio…
Ivan Totev
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Concatenate audio files using ffmpeg

I am trying to concatenate ac3 and aac using ffmpeg. ffprobe of jpn_op.m4a: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'jpn_op.m4a': Metadata: major_brand : M4A minor_version : 512 compatible_brands: M4A isomiso2 encoder :…
cyclonejet
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Map different streams in FFmpeg, is this identical? And working?

I use FFmpeg on Windows 10 (command line). I want to reencode a video with: Video stream -> x265 CRF 20 Audio stream 1 -> AAC stereo 128k Audio stream 2 -> AAC stereo 96k Subtitle 1 -> copy Subtitle 2 -> copy Subtitle 3 -> drop I am only wondering…
Serfoo
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FFmpeg check channels of a 7.1 audio for silence

This is a follow-up question from my previous question asked here, where I needed to look for silence within a specific audio track. Here is the ffmpeg life-saver solution where helps to get some metadata: ffmpeg -i file -map 0:a:1 -af astats -f…
Tina J
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what is the content of an .acc audio file?

i may sound too rookie please excuse me. When i read a .AAC audio file in Matlab using the audioread function the out put is a 256000x6 matrix. how do i know what is the content of each column? filename = 'sample1.aac'; [y,Fs] =…
zahraesb
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aac encoding with ffmpeg result in super short file

So I'm having problem with AAC encoding. I'm trying to encode some synthetic sound waves, but it does not work as expected. The file I get gives just a super short sound when played in VLC. When I play is in ffplay is plays like I expect, but it…
Mockarutan
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Creating preview audio clips from m4a files

Another post here answered the question of creating 30 second preview clips from WAV audio files (Create mp3 previews from wav and aiff files). My needs slightly overlap, but differing details are beyond my knowledge. Requirements/Options: clip…
Paul Palm
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Play stream shoutcast url aac+ stream using phonegap

Hi there someone know how to stream audio with an acc+ shoutcast url? i tried with this code: http://pastebin.ca/2228987 but without luck, i know theres is something like npr-android-app or tunein that uses some media proxy something like that but…
alexistkd
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NSData from NSURLConnection does not match when downloading file directly

I am trying to find FFF9 hex representation in and NSData object that I get with NSURLConnection when I type the url address to my web browser and download the file to my mac then I open it a text editor I get following values which seems true Few…
SpaceDust__
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