In my case, thank a combination of Google and the fact that I make
most of my living off things like tiff files.
On Jul 5, 2009, at 5:08 PM, Marta Edie wrote:
Thanks, Eric, one more thing I did not know. How do you all know so
much?
Marta
On Jul 4, 2009, at 18:22 PM, B. Eric Bradley wrote:
Tagged Image File Format. It was developed by Aldus, the original
people behind Pagemaker. The 'tags' in question were intended to
let the files support various formatting options, but very few
people made use of them and it's mostly used for simple
uncompressed raster images. (There's an option in Photoshop to
compress them using the LZW algorithm but some page layout
programs won't utilize them properly in that format.)
On Jul 4, 2009, at 4:33 PM, Marta Edie wrote:
Lee, I am late in answering, but I seem to be always late. God
will probably have to postpone my death .
But I did want to thank you for this interesting piece of email.
Motion Picture Experts Group. Who would have thought! My thoughts
did not get farther than a peg with an M on top!!!!. I did print
this out, it is amazing. Thanks so much. Now I can shine to my
friends who have ONLY Dells.
I now begin to wonder what TIFF stands for.
Thanks again for that thorough explanation
Marta
On Jun 28, 2009, at 19:38 PM, Lee Larson wrote:
On Jun 28, 2009, at 6:00 PM, Marta Edie asked:
And one questions begets another: what is the difference
between mp4 and mp3 . Methinks that somehow i cannot send files
easily when they are in mp4.
There's a computer industry committee, formed in the late 1980s
called the Motion Picture Experts Group (a.k.a. MPEG). Their job
is to define standards for compressing and encoding sound and
video for playback on computers. They've come out with a series
of definitions called the MPEG standards.
Their first set of standards is called MPEG-1 and came out in
the early 1990s. The ubiquitous mp3 sound files are technically
MPEG-1 Level 3 sound files.
In the late 1990s, their fourth revision was issued and was
called (big drum roll!) MPEG-4. The mp4 sound files are one type
of sound file under the MPEG-4 umbrella. I think the mp4 and m4a
files are the same, and Apple seems to use both extensions.
Apple uses m4b when the mp4 files are bookmarked, such as with
audio books and some podcasts.
In theory, mp4 files should be playable on any platform, as long
as modern software is installed. Problems arise because mp4 is
really a container format rather than a sound format. This means
that there are several different ways to encode and compress the
data contained therein. These different methods are called
codecs. Not all developers choose to support all the standard
codecs.
It is an interesting tidbit that the MPEG-4 specifications were
largely based on Apple's QuickTime and Apple holds several
important patents for ideas used in MPEG-4.
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