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Editing AVI files

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December 30, 2004 2:34:38 PM

Archived from groups: rec.video.desktop (More info?)

I'm told that editing AVI files is an entirely different animal from
editing MPG files. What are the differences? What tool do you suggest
for editing AVI files?

More about : editing avi files

December 30, 2004 3:43:27 PM

Archived from groups: rec.video.desktop (More info?)

"Guy" <newsgroupposter@hotmail.com> wrote in message news:1104435278.119860.290800@c13g2000cwb.googlegroups.com...
> I'm told that editing AVI files is an entirely different animal from
> editing MPG files. What are the differences? What tool do you suggest
> for editing AVI files?

MPG is a specific encoding format, or rather a set of formats.

AVI is a file specification only; i.e. it may take any number of
different compression/encoding methods, or it may not be
compressed at all.

The difference is, if you have (for example) an MPEG1
codec installed on your system, you'll be able to edit *any*
MPEG1 file. But there is no such thing as a single AVI codec.
In order to edit an AVI file one needs to know whether it's
compressed, and if so, which codec was used to compress it,
and this particular codec must be installed.
Anonymous
December 30, 2004 5:56:09 PM

Archived from groups: rec.video.desktop (More info?)

>I'm told that editing AVI files is an entirely different animal from
>editing MPG files. What are the differences?

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.

MPG video is composed of 3 different kinds of frames - I, B, and P.
In order to minimize the amount of data required to recreate each
frame, one complete frame ("I") is sent, then the differences between
that one and the next are sent to recreate the next frames ("B" and
"P"). You can only cut on "I" frames. This means a fraction of the
previous scene may disappear (or part of the next scene may remain)
where you make a cut. This is annoying to some and looks sloppy
if you are editing video for presentation.

>What tool do you suggest
>for editing AVI files?

http://www.videohelp.com/edit#5;19

VirtualDub is often talked about here. Adobe Premier.
I personally use Sony Vegas.

There are many many others.
Related resources
Anonymous
December 30, 2004 10:52:17 PM

Archived from groups: rec.video.desktop (More info?)

On Thu, 30 Dec 2004 12:43:27 -0800, "Mike" <me@privacy.net> wrote:

>"Guy" <newsgroupposter@hotmail.com> wrote in message news:1104435278.119860.290800@c13g2000cwb.googlegroups.com...
>> I'm told that editing AVI files is an entirely different animal from
>> editing MPG files. What are the differences? What tool do you suggest
>> for editing AVI files?
>
>MPG is a specific encoding format, or rather a set of formats.
>
>AVI is a file specification only; i.e. it may take any number of
>different compression/encoding methods, or it may not be
>compressed at all.
>
>The difference is, if you have (for example) an MPEG1
>codec installed on your system, you'll be able to edit *any*
>MPEG1 file. But there is no such thing as a single AVI codec.
>In order to edit an AVI file one needs to know whether it's
>compressed, and if so, which codec was used to compress it,
>and this particular codec must be installed.
>

This is right. .avi is not an encoding format, it is often called a
container type: the way data is organised in the file; a file
specification indeed. Often not well understood, please remember.
Anonymous
December 30, 2004 11:33:02 PM

Archived from groups: rec.video.desktop (More info?)

On a sunny day (Thu, 30 Dec 2004 14:56:09 -0500) it happened Fuzzy Wuzzy
<nospam@please.com.invalid> wrote in
<0tm8t0hf4s63326b4mu78n9fhs1p817ck4@4ax.com>:

>
>>I'm told that editing AVI files is an entirely different animal from
>>editing MPG files. What are the differences?
>
>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.
>
>MPG video is composed of 3 different kinds of frames - I, B, and P.
>In order to minimize the amount of data required to recreate each
>frame, one complete frame ("I") is sent, then the differences between
>that one and the next are sent to recreate the next frames ("B" and
>"P"). You can only cut on "I" frames.
This is not correct, if you properly decode the frame sequence you
want to cut in, then can cut at any frame, it takes slightly more
processing power.
Good mpeg editors do this.
JP
January 3, 2005 4:04:04 PM

Archived from groups: rec.video.desktop (More info?)

Thanks to you both for the information!

JP, what MPEG editors do you recommend?

Do any AVI and/or MPEG editors support audio editing, too? e.g., muting
some of the dialog?
January 3, 2005 4:05:21 PM

Archived from groups: rec.video.desktop (More info?)

Thanks. So as long as a codec is installed that permits playback of the
AVI, an editor like VirtualDub should have no trouble with it?
January 4, 2005 3:48:03 PM

Archived from groups: rec.video.desktop (More info?)

>>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?
Anonymous
January 4, 2005 5:31:10 PM

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.
Anonymous
January 4, 2005 7:22:21 PM

Archived from groups: rec.video.desktop (More info?)

On Thu, 30 Dec 2004 20:33:02 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

>if you properly decode the frame sequence you
>want to cut in, then can cut at any frame

The thing is, if the frame is not a key one, then the editing program
needs make it a keyframe, and derive the rest of frames, up to the
next keyframe, from this new keyframe, which involves re-encoding of
these frames. Frame accurate mpeg-editors (mpeg-vcr, VideoRedo...) do
this, while you may stumble upon an Avi editor (VirtualDub, for
instance) which does not -and thus, cannot cut but on keyframes.
December 8, 2010 10:46:54 AM

Here I would like to share you 2 methods for editing avi files on mac, one is iMovie, another is AVI Editor for Mac (which doesn’t have many advanced capabilities, but for beginners and hobbyists it’s a great way to get started and get creative with your editing).
!