[M4IF Technotes] Suggest some MPEG 4 Encoders

[Ivan Dimkovic]

>
> Who's code is being used by QT6? I think I read somewhere that it was from
> Dolby? Is this true? Is any one implementation better than another? I hear
a
Implementations from different vendors might differ if they are built
independently.
Situation is almost the same as with MP3 - for example Fraunhofer and Xing
MP3 encoders were different in quality.
> lot of talk about a "Psytel" encoder on the PC. Is its AAC encoding any
> better or worse than QT6's AAC? I tried to play the Psytel demos on the
> author's site with QT6...all I got was silence. Are there compatibility
> problems when going from one encoder to another?
>

I suppose this is the MP4 file format issue - Psytel files on
www.psytel-research.co.yu/showcase.htm are playable on latest Envivio
plug-in for RealPlayer and MPEG4IP player (www.mpeg4ip.net) - on the
elementary stream level - encoder is fully ISO compatible.
Some of the problems were because Psytel's MP4 files carry 'MPEG-2 AAC LC'
object type, and some MPEG-4 decoders won't decode them! It was an issue
with envivio player, I am not sure if they fixed that.
Now, regarding quality - for MP3 and AAC there are audiophile forums with
lot of audio encoding experts - one is www.hydrogenaudio.org
> I used LAME at its highest 320k setting to create MP3s before I decided to
> store uncompressed WAVs and/or use the lossless Monkey's Audio compressor
> for best possible sound quality. Will I be happy with the quality of AAC?
Is
> it really as good as they say?  Or should I stick with WAVs or wait until
> someone comes up with a Monkey's Audio decoder/player for the Mac?
>

AAC is higher quality than MP3 - when good AAC encoder is used. 128 Kb/s AAC
is as good as, say, 160 Kb/s MP3.  AAC also offers a lot of new features,
like - multichannel ability, etc..
Best Regards,
*************************************************
Ivan Dimkovic, Technical Manager
PsyTEL Research
Multimedia Coding Solutions
Belgrade Yugoslavia
phone:  +381 63 264 334
phone:  +381 64 11 40 600
fax:       +381 11 32 25 275
email:  dim   psytel-research.co.yu
www:  http://www.psytel-research.co.yu
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