On 17/5/2011, at 5:21pm, Christopher Woods (CustomMade) wrote: > I've been taking some previously downloaded raw AAC files (downloaded with > get_iplayer) and wrapping them as M4As using YAMB. For e.g.: > > Randomfile.m4a = 111 MB (116,501,077 bytes) > Randomfile.aac = 111 MB (117,371,538 bytes) > > I've observed that consistently the resulting M4As are slightly smaller than > the raw AACs. Is this to be expected? Is it something to do with the way the > stream is muxed? I'm certainly not intentionally altering any aspect of the > file during the M4A creation, so how come the M4As (which one would > logically expect to be slightly larger given the wrapper overhead) end up > being the opposite?
I'm not going to swear to it, but as long as the conversion is only taking a few seconds, then there's probably nothing to worry about. Hopefully some others will chime in, but conversion to MP3 would take a lot longer (probably several minutes on a current PC? Try it to find out). If you're not transcoding, then you're (hopefully!) not performing a lossy operation on the audio stream. aB. _______________________________________________ get_iplayer mailing list [email protected] http://lists.infradead.org/mailman/listinfo/get_iplayer
