[M4IF Technotes] generation of mp4 files

[xin chen]

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?
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.
Thank you very much.
__________________________________________________
Do you Yahoo!?
New DSL Internet Access from SBC & Yahoo!
http://sbc.yahoo.com