codec

A codec is a program that is used for encoding or decoding a signal. It encodes a data stream for storage, possibly in encrypted form, and the decoder function reverses the encoding for playback or editing. They are used in streaming media, and video editing applications.

Forms of audio codecs:

• GSM – 13 Kbps (full rate), 20ms frame size
• iLBC – 15Kbps,20ms frame size: 13.3 Kbps, 30ms frame size
• ITU G.711 – 64 Kbps, sample-based. Also known as A-law/μ-law
• ITU G719 – 32/48/64/128 Kbps, 28 ms Frame Size
• ITU G.722 – 48/56/64 Kbps
• ITU G.723.1 – 5.3/6.3 Kbps, 30ms frame size
• ITU G.726 – 16/24/32/40 Kbps
• ITU G.728 – 16 Kbps
• ITU G.729 – 8 Kbps, 10ms frame size
• Speex – 2.15 to 44.2 Kbps
• LPC10 – 2.5 Kbps
• DoD CELP – 4.8 Kbps

Forms of video codecs:

• VP8 is codec used for the encoding and decoding of high definition video as a either a file or a bit-stream for viewing. The VP8 codec is – in contrast to the H.264 codec – free for use.
• H.264/MPEG-4 Part 10 or AVC (Advanced Video Coding) is currently one of the most commonly used formats for the recording, compression, playback of high definition video. In contrast to VP8, H.264 is not free.