Free online WMV to MJPG converter

Some video editors, inspection systems, and legacy playback devices accept Motion JPEG but not WMV, so converting provides an individually decodable JPEG frame stream. You can convert the file for free on 101convert.com without installing software, or use FFmpeg locally for format and quality control.

What the WMV format is

WMV (Windows Media Video) is a Microsoft video format commonly stored in .wmv files and sometimes inside ASF containers. Microsoft Windows Media Encoder, older Windows video tools, screen-recording software, and legacy cameras or editing applications created many WMV files. You may encounter it in older Windows media libraries, downloaded recordings, archived presentations, and files exported by discontinued software.

WMV files can use different codecs, including WMV 7, WMV 8, WMV 9, and VC-1, with optional WMA audio. The extension identifies the file family, not one fixed resolution, frame rate, or compression setting.

What the MJPG format is

MJPG, or Motion JPEG, stores video as a sequence of independently compressed JPEG images. Unlike interframe codecs, it does not use nearby frames for prediction, so a player or editor can decode and seek to individual frames without reconstructing a long dependency chain.

Motion JPEG is used by some industrial cameras, capture devices, surveillance systems, browser-compatible video workflows, and older editing hardware. It is useful when frame-by-frame access and broad intra-frame editing support matter more than compact file size. MJPEG normally requires substantially more storage than WMV at comparable resolution and frame rate.

The output can be a Motion JPEG video in an AVI container, commonly named .avi, or a raw MJPEG stream with an .mjpg extension. These are not interchangeable for every application: check whether the receiving device expects an AVI container or an elementary MJPEG stream.

How to actually convert WMV to MJPG

Using 101convert.com

1. Open the WMV-to-MJPG conversion page on 101convert.com.
2. Select the .wmv file.
3. Choose MJPG as the output format and start the conversion.
4. Download the result and test it in the target editor or device. If the target specifically requires an AVI container, select AVI or use the desktop method below.

Using FFmpeg for an MJPEG AVI file

Install FFmpeg, open a terminal in the folder containing the source file, and run:

ffmpeg -i input.wmv -c:v mjpeg -q:v 3 -c:a pcm_s16le output.avi

This copies the WMV video into a new Motion JPEG video stream and converts audio to uncompressed PCM, which is widely accepted in AVI workflows. Use -an instead of -c:a pcm_s16le if the destination needs video only:

ffmpeg -i input.wmv -an -c:v mjpeg -q:v 3 output.avi

Creating a raw MJPEG stream

If the receiving software explicitly requests a raw .mjpg stream, use:

ffmpeg -i input.wmv -an -c:v mjpeg -q:v 3 -f mjpeg output.mjpg

Raw MJPEG usually contains no audio and may not carry dependable metadata such as duration or frame rate. Use the AVI command when the specification says “MJPEG AVI,” “AVI Motion JPEG,” or simply requires a normal playable video file.

Quality, compatibility, and limitations

FFmpeg’s -q:v value controls JPEG quality for the MJPEG encoder; lower values generally mean higher quality and larger files. Values around 2 to 5 are a practical starting range, but inspect the result on the target system because encoder implementations differ.

The conversion decodes the WMV frames and JPEG-compresses them again, so it cannot restore detail already lost in the source. Unless you specify other options, FFmpeg keeps the source dimensions and frame rate. To set them explicitly, add options such as -vf scale=1280:720 -r 30, but scaling or changing frame rate can reduce detail or create duplicated frames.

MJPEG output is often much larger than the original WMV, and uncompressed PCM audio can add substantial size. If the target accepts compressed audio, choose an audio codec supported by that device instead of PCM; if it requires a strict legacy AVI profile, retain PCM and verify the maximum supported resolution, frame rate, and file size.