Question

Who can give me a brief explanation for audio/video formats in general?

Answer 1

You can refer to this link to learn what the video and audio formats are: http://www.any-video-converter.com/supported-formats.php. It will give you details on every formats, such as .3gp2 is for CDMA-based phones.

Answer 2

The Audio and Video formats are created based on the codecs used. For example, the XviD codec will always allow you to create content in MPEG-4 ASP format.

The list of most used video formats is pretty big, but the most common video formats you'll encounter are: AVI, Mpeg, MKV, and AVI.

For the audio formats, the most common ones are: MP3, WAV, FLAC, OGG, and WMA.

Video formats: http://en.wikipedia.org/wiki/Video_file_format
Audio formats: http://en.wikipedia.org/wiki/Audio_file_format