Free online DIVX to MJPG converter

Some video editors, cameras, and inspection systems accept Motion JPEG but do not decode DivX MPEG-4 video. Converting the video to MJPEG creates independently compressed JPEG frames, usually inside an AVI container for broader hardware and software compatibility.

What the DIVX format is

DivX is primarily an MPEG-4 Part 2 video codec associated with files using the .divx extension or AVI containers. DivX encoding software and older video-authoring tools created these files to deliver relatively small videos at acceptable quality. You may encounter them in downloaded video archives, older camera or recorder exports, legacy media libraries, and discs authored with DivX support.

The extension alone does not guarantee the exact container or audio format, so inspect the file with MediaInfo or FFmpeg before converting. The video stream normally needs to be decoded and re-encoded; simply changing the filename extension cannot turn DivX into MJPEG.

What the MJPG format is

MJPG, usually called Motion JPEG or MJPEG, stores each video frame as a separate JPEG image. It is commonly carried in an AVI file with an MJPG video stream, although some devices use an elementary .mjpg stream.

Because frames are independent, MJPEG is easy for many capture devices, editors, diagnostic systems, and older hardware to decode. It also allows frame-accurate cutting without inter-frame dependencies. Its disadvantages are larger files than DivX at comparable visual quality and lossy JPEG compression, particularly around text, fine lines, and repeated re-encoding.

How to actually convert DIVX to MJPG

FFmpeg is the most controllable desktop option. Install a current FFmpeg build, open a terminal in the folder containing the source, and run:

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

This decodes the DivX stream, encodes video as MJPEG, converts audio to uncompressed PCM for broad AVI compatibility, and writes output.avi. FFmpeg's MJPEG quality scale uses lower values for better quality and larger files; try -q:v 2 for higher quality or -q:v 5 for smaller output. If the source has no audio, use -an instead of -c:a pcm_s16le.

To preserve an audio stream that the target device accepts, use -c:a copy, but PCM is generally safer for AVI-based MJPEG workflows:

ffmpeg -i input.divx -c:v mjpeg -q:v 3 -c:a copy output.avi

For a device that specifically requires an elementary MJPEG stream rather than AVI, use:

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

On 101convert.com, use the site's free converter without installing software: select the DIVX file, choose MJPG as the output format, start the conversion, and download the result. Check the required container first, because a device asking for MJPEG in AVI may reject a standalone .mjpg file.

Quality, compatibility, and limitations

Conversion cannot restore detail already lost by DivX compression. It adds another lossy stage, so inspect a short sample before converting a large archive. MJPEG files can be several times larger than the source; confirm available disk space and the destination device's maximum resolution, frame rate, pixel format, and file size.

Use ffprobe input.divx to check streams, dimensions, frame rate, and audio before choosing settings. If the target system requires a particular frame rate or size, add filters such as -vf scale=1280:-2 -r 30; changing these values can alter motion timing or image sharpness.