VRO is a digital audiovisual file format for streaming DVD recordings. When generated, this file usually comes with an IFO file for providing the location information of the VRO file. Generally, VRO is like a collection of VOB files. However, fragmented VROs are not widely supported.
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Xvid is a cross-platform video codec for compressing video files. It can compress a video file at a more than 200:1 ratio. This, in return, makes it easier and quicker to transmit video files over the internet. Also, compressed videos take up less storage space. It compresses data using the MPEG-4 standard.
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