AVCHD to AIFF Converter

Extract AVCHD Audio to AIFF: What This Tutorial Covers

This walks you through pulling the soundtrack out of an AVCHD camcorder clip (the .mts or .m2ts files Sony and Panasonic cameras record) and decoding it to an uncompressed AIFF file — the big-endian PCM format Logic Pro, GarageBand, Final Cut, and Pro Tools read natively on macOS. The HD video is discarded; you keep just the audio, ready to drop onto a track without a decode pass.

How to Convert AVCHD to AIFF

1. Upload Your AVCHD File: Drag and drop your .mts or .m2ts clip onto the page, or click "+ Add Files" to browse. Several clips can be queued and processed with the same settings.
2. Set Audio Channel: Leave Audio Channel on Original to keep the source layout, choose Stereo to fold a 5.1 camcorder track down to two channels, or Mono to halve the output size for voice-only recordings.
3. Set Audio Sample Rate and Trim (Optional): Leave Audio Sample Rate on Original (camcorders record 48 kHz) unless you need 44.1 kHz for CD mastering. Switch Trim from Unchanged and enter a Start Time and Duration to export only one segment.
4. Convert and Download: Click Convert and download your AIFF. No sign-up, no watermark.

Walk-through: What Actually Happens to the Audio

The output is fixed at PCM 16-bit big-endian (PCM_S16BE) — the CD-standard AIFF flavor that Logic, Pro Tools, and GarageBand assume. What matters is understanding what the source audio was, because AIFF cannot add quality the original never carried:

• If your camcorder recorded Dolby Digital (AC-3) — the default on most consumer AVCHD models — that track was already lossy-compressed at capture. Decoding it to AIFF PCM produces a much larger file with no quality regain: you get a faithful, lossless copy of an already-lossy signal. This is the right move for editing (no further generation loss in your DAW), not a fidelity upgrade.
• If your camcorder recorded Linear PCM — some professional NXCAM and prosumer bodies do — the source was already uncompressed, so extracting to AIFF PCM is essentially a lossless transcode of uncompressed audio. The file stays large but the audio is bit-faithful to the recording.

Either way, expect the AIFF to dwarf the original .mts: uncompressed PCM runs roughly 10.1 MB per minute at 44.1 kHz 16-bit stereo (about 11.0 MB per minute at 48 kHz). Leaving Audio Sample Rate on Original avoids an unnecessary resample, since 48 kHz is already the video-production standard.

Common Errors and How to Fix Them

• "The AIFF file is enormous" — Expected. AIFF is uncompressed, so size scales with sample rate, bit depth, and channel count, not content. If you need something small to email or archive, extract to a compressed format instead — see AVCHD to MP3.
• "The exported audio is silent" — Some AVCHD clips carry dialogue on a secondary channel or a multichannel layout a player ignores. Keep Audio Channel on Original first; if a downstream tool still plays nothing, fold to Stereo.
• "It won't open in Windows Media Player" — AIFF is the Apple-native uncompressed format; Windows Media Player and the Films & TV app do not handle it. Use VLC, foobar2000, Audacity, or Reaper on Windows, or extract to AVCHD to WAV for the Windows-native equivalent at identical quality.
• "Audio drifts out of sync on long clips" — Lossy AC-3 streams include a few milliseconds of encoder padding at the start, which can nudge sync on long recordings. Trim the leading silence or nudge the AIFF back in your editor.
• "I wanted to keep the 5.1 surround" — Folding to Stereo or Mono is a downmix; the discrete surround channels are combined, not preserved. To keep the original surround track intact, convert with AVCHD to AC3 instead.

When This Doesn't Work

Converting to AIFF changes the container and decodes the audio — it does not recover quality. If the source was Dolby AC-3, the AIFF is a faithful copy of the already-compressed signal, not a restored uncompressed master; no tool can rebuild detail that AC-3 discarded at capture. The conversion also can't help with copy-protected or corrupted recordings, or clips whose audio stream is damaged on the card. If you only need the soundtrack from a standalone Dolby Digital file rather than a full AVCHD clip, AC3 to AIFF is the more direct route. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.

Frequently Asked Questions

Does converting AVCHD to AIFF improve the audio quality?

No. AIFF is an uncompressed container, but it can only hold whatever the source already contained. If your AVCHD audio was Dolby AC-3 (the default on most consumer camcorders), the AIFF preserves that audio exactly as decoded — it cannot restore frequencies or detail AC-3 removed during recording. You get a lossless copy of a lossy source, which is ideal for editing in a DAW but is not a quality upgrade. Where AIFF wins regardless of source is workflow: no re-decode in Logic or Pro Tools, and no further generation loss.

What audio codec does AVCHD actually use?

AVCHD camcorders record audio as either Dolby Digital (AC-3) or Linear PCM. AC-3 is the common choice on consumer models, running at 64 to 640 kbit/s across 1 to 5.1 channels. Some professional bodies record uncompressed Linear PCM (around 1.5 Mbit/s for stereo). Either way, this converter decodes that track to PCM and wraps it in an AIFF file as 16-bit big-endian samples.

Why is my AIFF so much larger than the original clip?

AIFF stores raw, uncompressed samples, so size depends on sample rate, bit depth, and channel count rather than how busy the audio is. A 44.1 kHz 16-bit stereo track is about 10.1 MB per minute, and a 48 kHz track about 11.0 MB per minute, regardless of content. The original .mts is far smaller because its audio (and the discarded video) were compressed. In our testing, a one-minute clip with 48 kHz 16-bit stereo audio produced an AIFF close to 11 MB.

Does this preserve 5.1 surround sound?

No — folding to Stereo or Mono downmixes the channels rather than keeping them discrete. If the source AVCHD contains a 5.1 AC-3 track and you select Stereo, the surround channels are combined into two. To keep the discrete surround channels intact, convert with AVCHD to AC3 instead, which stays within the AC-3 stream.

AIFF or WAV — which should I extract for a Mac audio workflow?

They hold identical uncompressed PCM; the difference is the container (AIFF is big-endian IFF, WAV is little-endian RIFF) and ecosystem fit. AIFF is the native, default recording format in Logic Pro and loads instantly across Apple apps with broader metadata support, so it is the natural pick for a Mac-only Logic or GarageBand session. The output here is fixed at PCM 16-bit big-endian (PCM_S16BE), the CD-standard AIFF flavor; if you need 24-bit headroom for mastering, choose AVCHD to WAV instead, which exposes more bit depths and has wider cross-platform support at the same quality. To pull one section only, switch Trim from Unchanged or run Audio Cutter on the result.

How long do you keep my uploaded file?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — never shared or made public. There is no account and no watermark, and the audio is not recompressed beyond the format change you requested. A multi-gigabyte AVCHD recording converts without a per-file cap; the practical limit is your upload size and connection speed.