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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M4A is a filename extension for AAC container format and is developed by Apple Inc. M4A music is bought on the iTunes Store and does not come with DRM protection. In terms of quality, M4A is better than MP3 because it is lossless but still compressed. This means that it occupies less storage space and doesn’t lose quality over time.
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