Archived from groups: rec.video.desktop (
More info?)
Guy wrote:
> >>AVI editing is frame accurate, MPG is not. This means that when
> editing an AVI, the frame you choose to start and stop a cut is
exactly
> where it will be cut.
>
> >Frame accurate mpeg-editors (mpeg-vcr, VideoRedo...) [can make a
frame
> a keyframe], while you may stumble upon an Avi editor (VirtualDub,
for
> instance) which does not -and thus, cannot cut but on keyframes.
>
> I don't understand. Which of the above two statements is accurate? If
> AVIs are "frame accurate", why are keyframes relevant?
I wanted to answer before, but was a bit busy here...
Indeed Virtualdub (avi editor) allows you to select start and end of a
section by moving to a next key frame.
If the file is for example in DivX format the keyframe may happen every
ten seconds.
Not great for editing.
If you make a DivX avi, and know you are going to cut parts, you could
use key frames more often (say once per second).
Nevertheless virtualdub is great for cutting commercials from the start
of a DivX etc...
In what I do, I edit BEFORE the encoding to DivX, and, because
sometimes I
use embedded subtitles, I feed the original that I use (say mpeg2
format)
through subtitler, and that allows me to cut and fade and change color,
insert pictures, subtitles of cause too, and do simple animations,
scrolling
lists etc..
So and almost always I process the sound separately.
I have experienced the same sound out of sync problem that somebody
else
mentioned here when using for example the womble mpeg editor demo
(it can cut frame accurate mpeg2).
Because of corrections to sound etc. I want the sound in the wave
editor
anyways.
Often it needs to be recoded, bitrate change etc..
I am doing pretty wild sound editing in Linux just with things like
wavecat, multimux, substractwave and a whole lot of small utilities,
sox,
If you want to have a closer look look at
http://panteltje.com/panteltje/dvd/
http://panteltje.com/panteltje/dvd/big-dvd.txt
http://panteltje.com/panteltje/subtitles/
That is about multi language 8 channel DVD authoring.
Because it is all scripts, it is 100% reproducible, and it is easy
to change something in the scripts and run it again on the source
material
to get a different result.
So what I am getting at, not the click and drag and drop interfaces for
me.
If the editor allows no scripting, you cannot ever reproduce what you
did.
The other thing about re-rendering is that you do not really lose that
much
quality as you may think.
Basically I use whatever method seems the most useful at that moment..,
sometimes all of them combined.
PC has been coding many a night, pick up the result in the morning.
Again here scripts make life very easy.
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