| | MPEG-4 File Format, Version 2 |
 | | In 2005, the MPEG committee announced two additional audio capabilities: Audio Lossless coding (ALS; lossless compression of multi-channel sound using time-domain prediction and entrogy coding) and Scalable to Lossless coding (SLS; a scalable enhancement layer is added to a lossy bitstream that extends the representation to lossless but which can be truncated at delivery time). |
| | This lineage is shared with the supertype for MP4_FF_2, ISO_BMFF, defined in Parts 12 of both the MPEG-4 and JPEG 2000 standards. |
| | Paraphrased from www.m4a.com: MP4 can be used for MPEG 4 video files, combined video and audio files, or just plain MPEG 4 audio. |
| www.digitalpreservation.gov /formats/fdd/fdd000155.shtml (2123 words) |
