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In video editing, IFO normally refers to a file on DVD-Video disc and stands for InFOrmation.
While the main content of DVD-Video disc are the VOB files which contain the actual MPEG-2 audio, video and subtitle streams, the IFO files provide information for DVD player where DVD-Video disc's chapters start, where certain audio tracks are located, etc..
Related software tools
Allows editing DVD-Video discs' IFO files, parsing VOB streams, creating IFO files and burning DVD discs -- all at one tool.