VOBs, or Video Object files, are DVD movie files encoded with MPEG video data, according to PC Magazine. Converting VOB files to MP4s (MPEG-4s) is not difficult since they are compatible formats; however, one must find a program that can read and convert VOB files and/or whole DVDs. HandBrake is a free program for download that deals specifically with ripping and converting DVD and VOB files to a number of different formats, including MP4s. Note that converting VOB files to MP4s may result in loss of audio/video quality, due to compression standards.
Step 1
Download and install HandBrake. Agree to the terms of use.
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Open HandBrake.
Step 2
Click the main "Source" button in the upper left-hand corner of the screen.
Use the finder window to locate your VOB files. Open them in HandBrake.
If you are converting off a DVD, insert your DVD and wait for HandBrake to recognize the data. If it doesn't recognize it after a few moments, click "Source" to locate the DVD files manually. Choose your chapter or track selections.
Step 3
Click the "Presets" or "Toggle Presets" button to open a side menu of preset options.
Choose one of the "iPod" presets. These are formatted for MP4 conversions.
Step 4
Choose your "Destination" output by clicking the "Browse" icon. Rename your file, if needed.
Step 5
Click "Start" to begin the conversion process. Depending on your files' sizes; this will take several minutes.