If you need to create Ogg Vorbis videos (.ogv) from other multimedia sources, including MPEG-4 (.mp4) you need to one of the multimedia conversion programs that support OGV format in first place. A great video converter with a broad format support is for example the Freemake Video Converter, which you can download for free and with it you can do mp4 to ogv conversion easily.
Updated: May 4, 2020
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