9. What is the difference between *.AAC and *.MP4 and *.M4A?
AAC files usually contain AAC with ADTS headers or raw AAC data streams. Raw AAC cannot be processed without decoding some of the stream. MP4, on the other hand, is a container format of the MPEG4 standard which can contain AAC streams and many other things. The data format of the two is very different and hence you cannot rename them to one another, they must be muxed (put into the container) or demuxed. Muxing of AAC into MP4 and demuxing can be done with Ivan & Menno. M4A is normally audio in an MP4 container that has been renamed to clarify that it is audio only. Itunes, Winamp5, and Realplayer gold encode to M4A now by default. Note that M4A and MP4 files can be switched to each other by simply renaming, since they are both extensions for the same container format.
Note that the \"Export ISO 13818-7 Stream\" option in the Nero encoder produces *.AAC files with ADTS headers. Again this is not a raw aac stream, Ivan & Menno is required to convert to raw aac.
http://forum.doom9.org/showthrea ... id=68300#post424070至少neroaacencoder转出来是mp4
