Free online OGV to MJPG converter

What the OGV format is

OGV is a video file based on the Ogg container, most commonly carrying video encoded with the open Theora codec and audio encoded with Vorbis or Opus. It is used by open-source applications, web projects, screen-recording tools, and some media archives. FFmpeg, VLC, Kdenlive, and other Linux-oriented video tools can create or export OGV files, so the format is often encountered when opening older web video, Wikimedia media, or recordings made with open-source software.

What the MJPG format is

MJPG, also called Motion JPEG, stores video as a sequence of independent JPEG images. Each frame can be decoded without reference to neighboring frames, which suits frame-accurate editing, capture hardware, machine-vision systems, and older software with limited codec support.

MJPG normally uses much more storage and bandwidth than Theora at comparable visual quality because JPEG compression is applied separately to every frame. A file ending in .mjpg may be a raw Motion JPEG stream with no audio; many devices instead expect an AVI container whose video stream uses the MJPEG codec.

How to actually convert OGV to MJPG

Using FFmpeg

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

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

This creates a raw MJPEG stream without audio. The -q:v value controls JPEG quality; lower values generally produce better quality and larger files. Values from 2 to 5 are a practical starting range.

If the receiving application expects an AVI file, use an AVI container instead:

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

This version keeps audio as uncompressed PCM, provided the source contains an audio stream. For a video-only AVI, replace -c:a pcm_s16le with -an. Use ffprobe output.avi or the receiving program's media information panel to verify that the video codec is listed as MJPEG.

Using the built-in online converter

You can convert the file on the 101convert.com website for free without installing software: select the OGV file, choose MJPG as the output format, start the conversion, and download the result. Check whether the downloaded file is a raw .mjpg stream or an MJPEG-encoded AVI if the target device specifies a particular container.

Quality, compatibility, and limitations

The conversion decodes Theora and re-encodes every frame as JPEG, so it is lossy. It cannot restore detail already lost in the OGV source. Test the output with the actual target device because MJPEG support often depends on the container, pixel format, frame rate, image dimensions, and audio handling, not just the codec name.

Raw .mjpg output generally has no reliable place for OGV audio, subtitles, or metadata. Choose AVI when those streams or broad legacy-player compatibility are required. Expect a substantially larger file than the source, especially at high resolution or with -q:v 2.