[M4IF Technotes] generation of mp4 files

[xin chen]

Thank you all for your help. Here is my ideas:
about the video of mpeg-4, the encoder of mpeg4ip,
both xvid and ISO compliant one, and the encoder of QT
Pro, are all ISO compliant, just different algorithms,
different profiles. right?
about the audio encoder, it's my mistake to not using
the -r option in faac command. I tried
  faac -m4 -pLC -r -b96 *.wav *.aac 
and it works:)
And David, I'm not clear about your idea of WAV
importer handling files with MPEG-4 AAC embedded in
them, what kind of example do you need? how to embed
an AAC file in WAV?
--- Dave Singer <singer   apple.com> wrote:
> At 01:09 -0700 10/4/02, xin chen wrote:
> >Hi all,
> >I've some questions during generation a mp4 file:
> >
> >1.Video Encoder: when player of mpeg4ip
> (gmp4player)
> >is used to decode the mp4 file generated by QT Pro,
> it
> >reports to use xvid plug-in to decode video, while
> >mpeg4ip itself supplies two kinds of encoder: ISO
> >encoder(mp4venc) and xvid encoder(xvidenc). So xvid
> is
> >different from ISO encoder, but it's ISO compliant?
> >Who can give me a detailed explanation of QT Pro
> >Encoder and its compliance with ISO?
> 
> I'd be happy to attempt to answer any questions you
> have.
> 
> >
> >2. Audio Encoder: I tried different ways to encode
> a
> >wav file to AAC format, under windows .aac is
> >generated but it is not recognized by QT, and when
> >.aac is packaged to .mp4 by mpeg4ip, cannot decoded
> by
> >QT either. Under Linux, I use the FAAC from
> mpeg4ip,
> >it fails and says:
> >faac -pLOW -b128 true.wav
> >Without libsndfile, only raw format is allowed
> >What does it mean? I think the wav file is correct
> >because it can be encoded into mp3 by lame of
> mpeg4ip.
> >
> 
> QuickTime handles only MP4 files with MPEG-4 AAC, as
> Ivan noted. 
> Does his answer solve your question?
> 
> I'd be happy to look at the possibility of our WAV
> importer handling 
> files with MPEG-4 AAC embedded in them, also, if
> needed.  I need to 
> know where that is specified, and have an example
> file.
> -- 
> David Singer
> Apple Computer/QuickTime
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