Convert AVI to AAC Online
Extract audio from AVI files (DivX, Xvid, legacy corporate video) and save as AAC. Compatible with iPhone, iPad, iTunes, and Apple Music. Free, in your browser.
.avi · up to 100 MB
What you can do
AVI to AAC: legacy audio for the Apple ecosystem
iPhone and iPad
AAC is the native codec of the entire Apple ecosystem: iTunes, Apple Music, iPhone, iPad, and AirPods.
100% private
Your AVI file never leaves your device. Full in-browser processing.
Corporate archiving
Modernize audio from legacy corporate training and presentations to AAC for current distribution.
MP3/AC-3 to AAC
DivX with MP3, DVD rip with AC-3: all converted to modern, compatible AAC.
How it works
Three steps, no hassle
Upload your AVI file
Drag or select your .avi file. DVD rips, corporate recordings, or legacy video. Up to 500 MB, no signup.
Extraction and AAC encoding
FFmpeg.wasm decodes audio from the AVI container (MP3, AC-3, PCM) and encodes it to AAC-LC in your browser.
Download your AAC
M4A or AAC file ready for iPhone, iTunes, Apple Music, or any Apple ecosystem device. Download with one click.
FAQ
Got questions?
The Apple ecosystem (iPhone, iPad, Mac, Apple TV, AirPods) is optimized for the AAC (Advanced Audio Coding) codec, which is the default audio format in iTunes, Apple Music, and all Apple streaming services. AVI files with MP3 audio can play on some Apple devices, but AAC offers better quality at the same or smaller file size, and is the format accepted directly by iTunes for syncing with iPhone and iPad. AAC in an M4A container is the standard delivery format for corporate audiovisual distribution to Apple devices.
AC-3 is a multichannel audio codec (5.1, stereo, or mono) designed by Dolby Laboratories and standardized by ATSC. In a DVD rip AVI, AC-3 audio is usually in stereo (2.0) or 5.1 surround configuration. When converting to AAC, if the audio is stereo, it is directly transcoded AC-3→PCM→AAC preserving both channels. If 5.1, FFmpeg applies downmix to stereo following ITU-R BS.775 coefficients before encoding to stereo AAC. The result is a stereo AAC-LC capturing the main audio content. Degradation is minimal at bitrates of 192 kbps or higher. For corporate training or documentary files where speech intelligibility is the priority, AAC at 128 kbps is completely sufficient.
For corporate narration, e-learning, and training: 96–128 kbps AAC-LC mono or stereo. At 128 kbps stereo, AAC offers quality equal to or better than MP3 at 192 kbps. For podcasts and presentations with music: 128–192 kbps stereo. For Apple Music or streaming platform distribution: 256 kbps AAC-LC stereo (Apple Music standard bitrate). For iPhone ringtones (M4R): 128 kbps is sufficient given the speaker hardware. Corporate AVI files typically have PCM (lossless) or MP3 at 128 kbps audio, so an AAC output at 192 kbps from PCM will produce better results than keeping the original MP3.
Yes, with conditions. Apple Music accepts AAC (M4A) files for distribution through distributors like DistroKid, TuneCore, CD Baby, Amuse, or directly via Apple Music for Artists if you are an accredited label or distributor. Apple's distribution requirements are AAC-LC at 256 kbps or WAV/FLAC at 16–24 bits. If your source AVI has 16-bit PCM audio, conversion to AAC 256 kbps meets the requirements. If the source is MP3 or AC-3 (already lossy), the resulting AAC will have two generations of compression, which technically slightly degrades quality, though at 256 kbps the difference is imperceptible. For quality masters, always start from lossless sources.
Corporate authoring systems from the 1990s and 2000s (Macromedia Director, Authorware, Microsoft Producer) generated AVI with PCM audio by default because it was the simplest codec to implement and required no patent licenses like MP3. AVI files from PowerPoint presentations exported as video, first-generation webinar recordings, and training material produced in 2000–2010 frequently have PCM audio at 44.1 kHz or 22.05 kHz, stereo or mono. This means that converting that AVI to AAC produces only one generation of compression from PCM, yielding high-quality AAC equivalent to an original audio recording — the ideal extraction scenario.
The AAC-LC codec has been supported on Windows since Windows 7 (2009) via the native DirectShow AAC decoder. Windows Media Player on Windows 10 and 11 plays M4A/AAC without additional plugins. Android has supported native AAC since Android 1.0. VLC, foobar2000, MPC-HC, PotPlayer, and virtually all modern Windows media players play AAC. The myth that AAC 'is only for Apple' has been incorrect since 2009: it is an ISO/IEC standard (13818-7 and 14496-3) with free, widely available decoders. The only historical exception was iTunes FairPlay DRM-protected AAC, which was Apple-exclusive, but the DRM-free AAC this tool produces is universally compatible.
Convert AVI to AAC: extract legacy video audio for iPhone, iTunes, and Apple ecosystem
Converting AVI to AAC is the standard operation when audio needs to be extracted from legacy AVI format video files for use in Apple ecosystem devices or services. The AAC (Advanced Audio Coding) codec was jointly developed by AT&T Bell Labs, Fraunhofer IIS, Dolby Laboratories, Sony, and Nokia, standardized by ISO/IEC as MPEG-2 Part 7 (ISO/IEC 13818-7) in 1997 and expanded in MPEG-4 Part 3 (ISO/IEC 14496-3) in 1999. Apple adopted AAC as the primary audio codec in iTunes in 2003, when the iTunes Music Store launched with AAC files at 128 kbps. Since then, the entire Apple content chain uses AAC: Apple Music distributes at 256 kbps AAC-LC, iPhones record video with AAC-LC audio at 48 kHz, AirPods are optimized for AAC decoding with minimal latency, and FaceTime uses AAC-ELD (Enhanced Low Delay) for voice communication. AVI files from the 1999–2010 period, by contrast, contain MP3 audio (in DivX/Xvid rips) or AC-3 (in DVD rips with multichannel audio) — older codecs with lower encoding efficiency than AAC. The AVI→AAC conversion allows integrating that legacy audio into modern Apple ecosystem workflows.
The most frequent use cases for AVI to AAC conversion concentrate in two areas: corporate archiving and independent music distribution. In the corporate sphere, organizations that generated large volumes of training material, recorded presentations, and webinars in AVI format during 2000–2015 need to convert that audio to AAC for distribution to employees with iPhones or iPads, uploading to e-learning platforms like Moodle, Cornerstone, or LinkedIn Learning (which accept M4A/AAC as the audio format), or archiving in enterprise content management systems. Corporate AVI files frequently contain 16-bit PCM audio at 44.1 kHz recorded from desktop microphones or presentation narration, meaning the AAC conversion involves only one generation of compression from source. In the music distribution sphere, artists with live performance recordings in AVI format (event camera video, home rehearsal recordings) can extract the audio to AAC for uploading to DistroKid, CD Baby, or Apple Music for Artists as singles or live albums.
Convertir.ai runs AVI to AAC conversion entirely in the browser via FFmpeg.wasm. The RIFF AVI container demuxing process begins with reading RIFF headers ('RIFF', 'AVI ') and the nested list structure: the hdrl block contains stream headers (avih for the main AVI header, strl with strf for each audio or video stream), and the movi block contains interleaved data chunks ('##wb' for audio, '##dc' or '##db' for video). The audio codec is identified in the WAVEFORMATEX block within strf: wFormatTag 0x0055 indicates MP3, 0x2000 indicates AC-3, 0x0001 indicates PCM. After demuxing, FFmpeg selects the appropriate decoder (libmp3lame decode for MP3, ac3 for AC-3, pcm_s16le for PCM), decodes to 32-bit float PCM in memory, and applies the native AAC encoder in libavcodec (aac encoder, AAC-LC profile) at the configured bitrate. The output file can be ADTS (.aac) for maximum compatibility or MPEG-4 (.m4a) with ISO container for iTunes and Apple Music. Duration, bitrate, and format metadata from the original AVI are transferred to the destination M4A container.