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VOB Files

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.VOB files are not actual MPEG files. For unencrypted DVDs, in most cases .VOB files can be renamed to .MPG and played. However, there can be DVDs for which .VOB files cannot be renamed to .MPG and played properly. Depending on the MPEG-2 splitter used, the video might be jerky, with chunks missing, or it may not play at all. If the DVD is encrypted, trying to play a .VOB file directly will result in garbage output.

This problem is caused by the fact that the information required to parse the .VOB file is in the .IFO files present in the DVD directory.