Re: Am I wise to convert all my AVIs?

Recently I downloaded a 700 MB AVI file.

Ass I played it I wanted to jump backwards & forwards in the
movie clip . Often when I did this there was a long pause (5 or
more seconds) and then playback resumed although sometimes it was
not smooth.

I got a converter utility and extracted the MPEG-1 file from the
AVI. The MPEG-1 is about 790 MB, so it is 14% bigger than the
AVI. But I can jump back and forth with no problem and no delay.

For the extra 14% i would say it is worth having the movie as an
MPEG rather than an AVI. Would playback quality of the MPEG-1 be
less than the AVI?


On 22 Apr 2006, Phil Carmody<thefatphil_demunged@xxxxxxxxxxx> wrote:

Was the playback quality less than the AVI?
If it was, then yes.
If it wasn't noticably worse, then it's not noticably worse.

There's _no way_ it can ever be better quality, as moving
between lossy formats almost always doubles your lossage.


Phil

I had *assumed* that the extraction process performed by my Blaze Media
Pro would remove the AVI wrapper and therefore I thought that the
quality of the un-wrappered "underlying MPEG" (which I would receive as
a file from the extraction process) would not be of a different quality
than the MPEG inside the AVI.

If I have understood you correctly, it seems that I have made some
incorrect assumptions because you refer to extra losses.

I would make a guess that the additional losses you refer to come from
the extractor utility effectively 'playing' the AVI and then re-encoding
that played output into a new MPEG. Presumably the extra losses come
from the compression of the video images into that new MPEG.

Is my understanding now correct or am I getting hopelessly tangled?

Anyone?

:-)
.

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