Xvid to AIFC

How to Convert Xvid to AIFC Online

1. Upload Your Xvid File: Drag and drop or click "Add Files" to add the AVI containing Xvid video. Xvid is an MPEG-4 ASP codec that's almost always wrapped in an AVI container, so files typically end in .avi. Older .divx and Xvid-tagged AVIs from camcorders, DVD rips, and 2000s-era downloads all work. Batch is supported — drop in a whole folder.
2. Pick File Compression mode: Under "File Compression," choose Quality Preset (Highest, Very High, High, Medium, Low, Very Low, Lowest) for VBR-style auto bitrate, or Constant Bitrate to lock a specific kbps (16, 32, 64, 96, 128, 192, 256, 320 kbps and more). Variable Bitrate ranges (e.g. 128K–192K) are also available.
3. Set Audio Channel and Audio Sample Rate (optional): Under "Audio Channel," pick mono or stereo. Under "Audio Sample Rate," pick 8 / 12 / 16 / 22.05 / 24 / 32 / 44.1 / 48 kHz, or leave on Original to match the source. Use the "Trim" section to set a start time and duration in HH:MM:SS.sss if you only need part of the audio.
4. Convert and Download: Click Convert. Files process in your browser session — no sign-up, no watermark — and download individually or as a ZIP.

Why Convert Xvid to AIFC?

Xvid is the open-source MPEG-4 ASP video codec that powered most 2000s-era AVI rips and early consumer camcorders; the audio inside the AVI is usually MP3 or AC3. AIFC (also written AIFF-C) is Apple's compressed variant of AIFF, defined in Apple Computer's "Audio Interchange File Format AIFF-C" specification (Version 1, August 26, 1991). Where AIFF stores raw uncompressed PCM, AIFC adds a compression-type field in the COMM chunk so the same container can carry μ-law, A-law, IMA 4:1 ADPCM, MACE 3:1, MACE 6:1, and other codecs at a fraction of the size. Pulling AIFC out of an Xvid AVI is most useful when:

• Feeding legacy Mac DAWs and sample libraries — AIFC was the audio format of choice for QuickTime 2.x–6, classic SoundEdit 16, and pre-OS X Logic / Pro Tools sessions. Old project templates that expect AIFC still exist in archived studios and forensic restoration work.
• Compact archival of dialog and voiceover — μ-law and A-law AIFC files are 2× smaller than 16-bit PCM AIFF at near-telephony quality, perfect for preserving long-form spoken-word AVIs (lectures, interviews, conference recordings) where bit-perfect music quality is unnecessary.
• Interoperability with telephony and IVR systems — G.711 μ-law and A-law are the codecs used in PSTN telephony and most legacy IVR / voicemail platforms; an AIFC wrapper around μ-law audio drops straight into those systems.
• Reading old CD-ROM and game audio toolchains — IMA ADPCM AIFC was common in 1990s multimedia CD-ROMs and Mac game audio. Restoring or remixing those titles often requires AIFC input rather than MP3 or AAC.
• Keeping the AIFF chunk structure your tool expects — Some scientific, medical, and broadcast tools written against the AIFF/AIFC spec parse the FORM/COMM/SSND chunk layout directly. AIFC keeps that structure while reducing size.
• Quick extraction from AVI without re-muxing — Instead of opening the AVI in a video editor to export audio, this converter pulls the audio track and re-encodes to AIFC in one step.

Xvid (AVI) vs AIFC — What Each File Carries

Quality Preset and Bitrate Guide

Frequently Asked Questions

What is AIFC and how is it different from AIFF?

AIFC (also written AIFF-C) is Apple's compressed variant of AIFF, introduced in the August 1991 AIFF-C specification. AIFF stores only uncompressed linear PCM. AIFC adds a compression-type code in the COMM chunk so the same FORM/COMM/SSND container can hold μ-law, A-law, IMA 4:1 ADPCM, MACE 3:1, MACE 6:1, and other codecs. The chunk structure and metadata layout are otherwise identical, which is why both formats sometimes share the .aif and .aiff extensions. If you need bit-perfect uncompressed audio, use Xvid to AIFF instead.

Will modern Logic Pro, Pro Tools, and Audacity open the AIFC?

It depends on the compression codec. Audacity and VLC handle the common AIFC codecs (μ-law, A-law, IMA ADPCM) well. Apple's older Logic Pro 7.0–7.0.1 had a documented issue importing AIFC and would prompt "What kind of file is this?"; modern Logic Pro and Pro Tools generally handle AIFC with common codecs but some reject obscure codecs like MACE. If a target tool refuses the AIFC, fall back to plain AIFF, WAV, or FLAC.

My Xvid file is .avi, not .xvid — does this still work?

Yes. Xvid is a video codec, not a container. It's almost always wrapped in AVI (sometimes labeled .divx), so you'll be uploading .avi files. The converter detects Xvid-encoded streams inside AVI and extracts the audio track regardless of the file extension.

What if the audio inside the AVI is already MP3 or AC3 — does it just remux?

No. Even if the source audio is MP3, AC3, or PCM, this conversion re-encodes to one of the AIFC compression codecs (μ-law, A-law, IMA ADPCM) so the output is a true AIFC file. That means a single re-encoding step from the source codec to the AIFC codec — a small, generally inaudible quality cost at Quality Preset: High and above. To avoid any re-encoding loss, use Xvid to AIFF which produces uncompressed PCM.

What sample rates and channel options are supported?

Sample rates: 8, 12, 16, 22.05, 24, 32, 44.1, and 48 kHz, plus an "Original" option that preserves the source rate. Channels: mono or stereo. For voice and telephony applications, 8 kHz mono μ-law-style output matches PSTN audio. For music, keep the source rate (usually 44.1 or 48 kHz) and stay stereo.

How big will the AIFC file be compared to the original AVI?

The AIFC contains audio only, so it's much smaller than the AVI. As a rough guide: a 90-minute Xvid AVI movie at ~700 MB has perhaps 80–100 MB of audio inside; the same audio at 128 kbps AIFC is ~85 MB, at 64 kbps ~43 MB, and at telephony-grade μ-law mono around 22 MB. Picking a lower Quality Preset or Constant Bitrate shrinks output proportionally.

Can I trim or extract a single clip from a long AVI?

Yes. The Trim section accepts a start time and duration in HH:MM:SS.sss (e.g. 00:12:30.500 for 12 minutes 30.5 seconds in). Use it to pull a single line of dialog from a recorded lecture or a song from a concert AVI without exporting the whole audio track first.

Are my files uploaded to a server?

Files are processed in your browser session and removed shortly after the conversion finishes. There's no sign-up, no watermark, and no public link — just download the AIFC and the source files clear from the session. For batch jobs you can also download all outputs as a single ZIP.

Should I pick AIFC, AIFF, or WAV for old Mac compatibility?

For pre-OS X Macs and very old QuickTime versions, AIFC is the most native choice — it's the format Apple designed for that era. For OS X / macOS workflows, plain AIFF (uncompressed) or WAV is more universally accepted by modern DAWs. AIFC is best when a specific legacy tool or archive expects the AIFF-C chunk format with compressed payload.