MP4 to AIFC Converter
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Supports: MP4, M4V
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Need help?MP4 to AIFC Converter
This tool extracts the audio track from an MP4 video and saves it as AIFC (AIFF-C), the extended version of Apple's AIFF container. The video is discarded — you get an audio-only file. AIFC is a niche, Apple-rooted format, so this page explains what it actually is, what byte order and sample data you end up with, and when it makes sense over plain AIFF or a smaller format like MP3.
What AIFC (AIFF-C) Actually Is
AIFF-C is not a different format from AIFF — it is the same chunk-based container with one structural addition. Standard AIFF stores only uncompressed PCM samples. AIFF-C extends the Common (COMM) chunk with a compression-type field, so the same file layout can describe either uncompressed PCM or audio packed with a codec such as µ-law, A-law, IMA ADPCM, or the older MACE schemes. An AIFF-C file is identified by AIFC (rather than AIFF) in its FORM header and carries a Format Version (FVER) chunk that plain AIFF files do not.
Two honest points specific to this converter:
- xconvert writes PCM, not a legacy compressed codec. The audio codecs offered for AIFC output here are all PCM variants (16-bit big-endian by default, plus 24-/32-bit, little-endian, A-law, and µ-law). So the file you download is an AIFF-C container holding uncompressed PCM — its size is essentially the same as an AIFF of the same depth, sample rate, and length. The "C" buys you the container, not a 6:1 size reduction.
- You cannot recover quality the MP4 already lost. Almost every MP4's audio is AAC, which is lossy. Decoding that AAC to PCM and wrapping it in AIFC gives you a faithful, lossless copy of the decoded signal — it does not restore detail discarded during the original AAC encode.
AIFC Format at a Glance
| Property | Value |
|---|---|
| Developer | Apple Inc., 1988 (based on EA's IFF) |
| Container | AIFF-C — chunk-based, identified by AIFC in the FORM header |
| Sample data | PCM by default; container can also hold compressed codecs (µ-law, A-law, IMA ADPCM, MACE) |
| Byte order | Big-endian by default; little-endian written as the sowt variant |
| Distinguishing chunk | FVER (Format Version) chunk, absent from plain AIFF |
| Common extensions | .aifc, also .aif / .aiff are permitted |
| Best for | Apple/macOS audio workflows that expect the AIFF-C container |
MP4 Audio at a Glance
| Property | Value |
|---|---|
| Container | MPEG-4 Part 14 (ISO/IEC 14496-14) |
| Typical audio codec | AAC (lossy); sometimes ALAC, MP3, or AC-3 |
| Byte order | Codec/container handled — not user-facing |
| Lossy? | Yes for AAC — the most common case |
| Best for | Carrying compressed video plus audio in one widely playable file |
How to Convert MP4 to AIFC
- Upload Your MP4 File: Drag and drop your MP4 (or M4V) onto the page, or click "Add Files" to browse. You can queue several files to convert with the same settings.
- Pick the Audio Codec: Under Advanced Options, the Audio Codec dropdown defaults to PCM 16-bit Big Endian — the standard AIFF-C payload. Choose 24- or 32-bit for higher headroom, or A-law / µ-law if a specific Apple workflow expects it.
- Set Audio Channel and Sample Rate (Optional): Leave both on Original to match the source, or force Mono/Stereo and a fixed sample rate (8000–48000 Hz). The Trim control can also clip the output to a start time and duration.
- Convert and Download: Click Convert and download the AIFC file. No sign-up, no watermark.
Frequently Asked Questions
Is the AIFC file from this tool actually compressed?
No. Although AIFF-C can hold compressed audio, the codecs offered here are all PCM, so the output is uncompressed audio in an AIFF-C container. Expect a file roughly the same size as an AIFF of the same bit depth, sample rate, and length — wrapping PCM in AIFC does not shrink it.
What is the difference between AIFC and AIFF here?
Structurally, AIFF-C adds a compression-type field to the Common chunk and a Format Version (FVER) chunk, and its FORM header reads AIFC instead of AIFF. Because this converter outputs PCM either way, the practical difference is mainly the container tag and byte order. If you want the plain uncompressed format, use MP4 to AIFF instead.
Will converting to AIFC improve the audio quality of my MP4?
No. MP4 audio is almost always AAC, which is lossy. Converting to AIFC produces a lossless copy of the already-decoded audio; it cannot rebuild detail removed during the original AAC compression. In our testing, the AIFC output sounded identical to the source MP4 audio — faithful, but not improved.
Which byte order does the output use?
PCM 16-bit Big Endian is the default, matching the traditional AIFF/AIFF-C convention. If you need little-endian PCM (Apple's sowt-style layout used on modern macOS), pick a Little Endian codec option, or convert to MP4 to WAV, which is little-endian PCM by nature.
What can open an AIFC file?
On macOS, QuickTime Player and the Music app handle AIFF-C natively. On Windows and Linux, players such as VLC and the audio editor Audacity open AIFC files. If a player rejects it, converting to a more universal format usually resolves playback.
Can I extract just part of the audio instead of the whole track?
Yes. Open Advanced Options and use the Trim control to set a start time and a duration, so only that segment is decoded and written to the AIFC file. This is handy for pulling a single clip out of a long recording.
Why would I use AIFC instead of MP3?
Use AIFC when a macOS-centric tool or archive specifically expects an AIFF-C/PCM file and you want a lossless working copy. If your goal is a small file for sharing or storage, a lossy format is far more practical — convert with MP4 to MP3 instead, since PCM-based AIFC files are large.