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Re: Recommended MPEG-4 settings

The Quality of a movie depends on many variables controlled by only one of them: the datarate.
Sure it's possible to achieve good results by choosing a preset but for going further you should have a fair knwoledge of the video compression. Ben Waggoner wrote a good book for CMP on the subject.

If the movie contains a lot of static scenes rather moving actions it's possible to decrease the datarate even without changing the framerate, thing that anyway deserves a try. There are several softwares that blend frames while doing this and often return miracles: I mean it's possible to make a movie running at 16fps almost indistinguishable from the original.

IMHO the MPEG-4 decoder of QuickTime isn't very efficient on XP, it requires a huge amount of processor power maybe becouse of the strong deblocking/antialiasing it performs; it seems optimized for small movie/lowdatarate movies and thus I'd not opt for this codec if I had to publish a PAL/NTSC resolution video which would also be quite blur when played back thru QuickTime.

Generally the approach is to gradually lessen the datarate up to the point artifacts became visible, disturbing and then rise it a bit. As a starting point try to multiplicate the height * width * framerate and devide the result by 40.000

Gianni Maselli


----- Original Message ----- From: "JF Neto" <email@hidden>
To: "patrick" <email@hidden>
Cc: <email@hidden>
Sent: Tuesday, November 01, 2005 9:43 PM
Subject: Re: Recommended MPEG-4 settings


Patrick,

Open your movie in QT Player Pro and select EXPORT to MPEG4. You may choose BROADBAND-HI from popup menu which best fit your requirements.

Don't be afraid to mess around, but test compatiblility of results.

Good Luck!

JFNeto


On Nov 1, 2005, at 5:25 PM, patrick wrote:

While on the topic of exporting to MPEG-4 video, another problem I
have is that I have no idea what settings to use to make a good
quality movie that can perform well on an average machine at a
reasonable size like 480x360. For example, what settings would Apple
use on their movie trailers?

The pre-set options available in iMovie are inadequate (IMHO). For
example, the "web" setting resolution is 320x240, which I believe to
be too small for a website of 2005. There are so many settings and
CODECs to choose from, and really no explanation as to what they all
do and how each setting affects the final movie, that I constantly
feel overwhelmed, and end up just guessing what to use.

Surely there are some recommended settings to use for a high-quality,
fast-loading MPEG4 movie?

Any advice would be greatly appreciated.

Patrick
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References: 
 >Recommended MPEG-4 settings (From: patrick <email@hidden>)
 >Re: Recommended MPEG-4 settings (From: JF Neto <email@hidden>)



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