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2011-08-06 21:06Joel N. Fischoff : [NF] Clipping AVI or MP4 files?
2011-08-07 03:17lelandj : Re: [NF] Clipping AVI or MP4 files?
2011-08-07 05:07Paul Hill : Re: [NF] Clipping AVI or MP4 files?
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[NF] Clipping AVI or MP4 files?

Author: Joel N. Fischoff

Posted: 2011-08-06 21:06:54   Link

Heya,

I'm looking for a program I can use to clip segments out of a AVI or MP4

file. Up until now, I've been using VirtualDub, but I've been having some

odd problems with it. For example, there are a few files that I have that

have a few leading seconds I want to remove, but every time I try, it

fails. It just will not take them off. So I'm looking for a relatively

simple video editing program that will allow me to select a beginning frame

and an ending frame, and save everything between them.

Any ideas?

Joel

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Re: [NF] Clipping AVI or MP4 files?

Author: lelandj

Posted: 2011-08-07 03:17:11   Link

Avidemux should work:

http://avidemux.sourceforge.net/

http://www.avidemux.org/admWiki/doku.php

Regards,

LelandJ

On 08/06/2011 08:06 PM, Joel N. Fischoff wrote:

> Heya,

>

> I'm looking for a program I can use to clip segments out of a AVI or MP4

> file. Up until now, I've been using VirtualDub, but I've been having some

> odd problems with it. For example, there are a few files that I have that

> have a few leading seconds I want to remove, but every time I try, it

> fails. It just will not take them off. So I'm looking for a relatively

> simple video editing program that will allow me to select a beginning frame

> and an ending frame, and save everything between them.

>

> Any ideas?

>

> Joel

>

>

[excessive quoting removed by server]

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Re: [NF] Clipping AVI or MP4 files?

Author: Paul Hill

Posted: 2011-08-07 05:07:30   Link

On Sun, Aug 7, 2011 at 2:06 AM, Joel N. Fischoff <petrukio@rcn.com> wrote:

> Heya,

>

> I'm looking for a program I can use to clip segments out of a AVI or MP4

> file.  Up until now, I've been using VirtualDub, but I've been having some

> odd problems with it.  For example, there are a few files that I have that

> have a few leading seconds I want to remove, but every time I try, it

> fails.  It just will not take them off.

AVI (normally mpeg4) or MP4 use keyframes and then just store the

differences until the next keyframe.

I think the problem is that you can't just remove a few seconds

without re-encoding.

See: http://www.virtualdub.org/docs_processing.html

"I tried to cut out some frames in direct stream copy mode, and

VirtualDub put them back in!?"

The only solution with VirtualDub is to use 'Full Reprocessing Mode'

or 'Fast Recompress' if you're not applying any filters.

Remember to select compression codecs!

I think Leland's suggestion of Avidemux can work around this problem:

"You use the smart copy mode. Only available for Divx3 and mpeg4.

Smart copy will re-encode the part that losts its reference images

with a fixed quantizer. A value of 4 or 5 is generally ok."

--

Paul

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