Convert OGG to OGA
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Ogg: the main file and streaming multimedia format
An open standardized format of the multimedia container type. Ogg is in the public domain and has no patent and license restrictions. Allows for playing and editing high-quality digital multimedia files. This format is not supported by devices powered by any Apple platform. An Ogg file can contain audio information and metadata. After compression, you can get files of different quality: medium or high. The compression process entails minimal loss.
The open standard of the multimedia container format
This is a free container audio file. This format allows you to store compressed audio information. Files of this format can be played by any media player that supports OGG, such as Windows and Unix players. It can utilize one of several encoding schemes. The format was developed by Xiph.Org. Its full name is Ogg VorbisAudio.