MJPEG to AIFF Converter

MJPEG to AIFF Converter

Motion JPEG (MJPEG) is a video codec, not an audio one — it stores each frame as a separate JPEG image and carries no audio of its own. This tool extracts the audio from an MJPEG file only when that file is wrapped in a container (such as AVI or QuickTime/MOV) that also holds a separate audio track, and writes it to uncompressed AIFF. If the source has no audio track, there is nothing to extract and the output would be silent — read on for how to tell.

Does Your MJPEG File Actually Have Audio?

A "raw" Motion JPEG stream is video only. Audio shows up only when the MJPEG video is packaged alongside an audio track inside a container format. Two common cases:

• Has audio (extractable): An .avi or .mov from a digital camera, camcorder, or capture card that used MJPEG for video and recorded sound. According to Wikipedia's Motion JPEG article, the audio from such cameras, "when included," was typically uncompressed PCM at a low sample rate or low-complexity ADPCM. This tool decodes that track to AIFF.
• No audio (nothing to extract): A surveillance/IP-camera clip, a webcam capture, a microscope or dashcam recording, or an exported animation that is video only. There is no soundtrack inside the file, so no converter can produce one.

If you are unsure, open the file in any media player and listen. If the player is silent, the file has no audio track and the AIFF output will be silent too.

MJPEG Format at a Glance

AIFF (Output) at a Glance

How to Convert MJPEG to AIFF

1. Upload Your MJPEG File: Drag and drop your .mjpeg, .avi, or .mov file onto the page, or click "+ Add Files" to choose it from your computer. Files upload over an encrypted connection, and you can queue several at once.
2. Set the Audio Codec (Optional): Open "Show All Options" to pick an AIFF codec. The default is PCM 16-bit Big Endian, the standard uncompressed AIFF payload; PCM 16-bit Little Endian, PCM A-law, and PCM mu-law are also available.
3. Adjust Audio Sample Rate, Audio Channel, or Trim (Optional): Leave Audio Sample Rate and Audio Channel on "Original" to copy the source exactly, or set a specific rate and channel layout; use Trim to export only a start-and-duration slice.
4. Convert and Download: Click "Convert" to decode the audio track to AIFF and download it. No sign-up, no watermark.

Frequently Asked Questions

Does a raw MJPEG stream contain any audio to extract?

No. Motion JPEG is a video-only codec — it is a sequence of independently compressed JPEG frames and defines no audio. Audio exists only when the MJPEG video is stored inside a container such as AVI or QuickTime/MOV that also holds a separate audio track. This converter decodes that track to AIFF when it is present; a bare MJPEG stream produces a silent file.

My MJPEG converted but the AIFF is silent — why?

The source file almost certainly has no audio track. This is common for IP-camera, dashcam, webcam, and surveillance footage, which is recorded video-only. No tool can create sound that was never recorded — you would need the original file that captured audio alongside the MJPEG video.

Is the AIFF output lossless, and will I lose quality?

AIFF stores uncompressed linear PCM, so the extraction itself is lossless — nothing is discarded. In our testing, an MJPEG-in-AVI clip whose audio was already PCM decodes to AIFF bit-faithfully, with file size scaling by sample rate, bit depth, and length. The one caveat: if the container's audio was lossy (for example AAC or MP3), wrapping it in lossless AIFF cannot recover detail that was already thrown away.

Why does the converter default to PCM 16-bit Big Endian?

AIFF was designed by Apple around big-endian PCM samples, so PCM 16-bit Big Endian (PCM_S16BE) is the format's native, most widely compatible payload — that is why it is the default here. You can switch to PCM 16-bit Little Endian, PCM A-law, or PCM mu-law under "Show All Options" if a specific tool requires it.

What is AIFF and how does it differ from WAV?

AIFF (Audio Interchange File Format) is Apple's 1988 uncompressed-PCM format, built on Electronic Arts' IFF chunk structure. It is functionally the macOS counterpart to Microsoft's WAV: both store lossless PCM, but AIFF samples are big-endian while WAV is little-endian. If you prefer a WAV master instead, use our MJPEG to WAV converter, or pick a small lossy file with MJPEG to MP3.

I actually want the video or a still frame, not the audio — what should I use?

This page discards the picture and keeps only the audio. To convert the whole clip to a modern, widely playable video, use MJPEG to MP4. To pull a single still image out of the footage, use MJPEG to JPG.

What happens to my uploaded file after conversion?

Your file is uploaded over an encrypted connection and processed on our servers, then deleted automatically a few hours after conversion. There is no sign-up, no watermark, and files are never shared or made public.