Image Sequences-why not suitable?

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Image Sequences-why not suitable?

by jfcwilson :: Rate this Message:

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Hi all,

I wonder, why are still image sequences, such as JPEGs, not suitable for real world use? I want video support as much as anyone, but for now, aren't JPEG sequences fine? Is the problem with the fact that audio can't be streamed directly with it? It's standard practice to stream the audio from a seperate file in games, anyway...Or is it becouse JPEG sequences are somewhat larger then Ogg Theora? That's not much of an issue when you've got DVD-ROMs to work with....

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Re: Image Sequences-why not suitable?

by Aidan Gauland-2 :: Rate this Message:

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James Wilson wrote:
> I wonder, why are still image sequences, such as JPEGs, not suitable for real world use? I want video support as much as anyone, but for now, aren't JPEG sequences fine? Is the problem with the fact that audio can't be streamed directly with it? It's standard practice to stream the audio from a seperate file in games, anyway...Or is it becouse JPEG sequences are somewhat larger then Ogg Theora? That's not much of an issue when you've got DVD-ROMs to work with....

To answer your question simply, because decompression time is crippling. To
give a little more detail, video codecs are designed for moving pictures, so
they can take into consideration similarities between consecutive frames when
encoding, which JPEG can not do, as it only deals with still images.

That said, still-image sequences are fine for short, low-res animations like
the spinning wheel in the Pipmak demo.

--Aidan

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Re: Image Sequences-why not suitable?

by jfcwilson :: Rate this Message:

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Really? Interesting. I rendered a 1024x1024 video, encoded it to 85% quality JPEG, and set it up in Pipmak. It worked fine, and ran on the intended 15 FPS. And my PC is fairly old, 1.9 GHz.

--- On Wed, 9/9/09, Aidan Gauland <wgsilkie@...> wrote:

From: Aidan Gauland <wgsilkie@...>
Subject: Re: Image Sequences-why not suitable?
To: "Content creation for the Pipmak Game Engine" <pipmak-users@...>
Date: Wednesday, September 9, 2009, 4:41 PM

James Wilson wrote:
> I wonder, why are still image sequences, such as JPEGs, not suitable for real world use? I want video support as much as anyone, but for now, aren't JPEG sequences fine? Is the problem with the fact that audio can't be streamed directly with it? It's standard practice to stream the audio from a seperate file in games, anyway...Or is it becouse JPEG sequences are somewhat larger then Ogg Theora? That's not much of an issue when you've got DVD-ROMs to work with....

To answer your question simply, because decompression time is crippling. To
give a little more detail, video codecs are designed for moving pictures, so
they can take into consideration similarities between consecutive frames when
encoding, which JPEG can not do, as it only deals with still images.

That said, still-image sequences are fine for short, low-res animations like
the spinning wheel in the Pipmak demo.

--Aidan

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Re: Image Sequences-why not suitable?

by Aidan Gauland-2 :: Rate this Message:

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James Wilson wrote:
> Really? Interesting. I rendered a 1024x1024 video, encoded it to 85% quality JPEG, and set it up in Pipmak. It worked fine, and ran on the intended 15 FPS. And my PC is fairly old, 1.9 GHz.

Do you mean a sequence of JPEG images, or is there some way of making an
animated JPEG that I don't know about? I thought that JPEG was only for still
images.

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Re: Image Sequences-why not suitable?

by jfcwilson :: Rate this Message:

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I meant a JPEG sequence, sorry for any confusion.

--- On Thu, 9/10/09, Aidan Gauland <wgsilkie@...> wrote:

From: Aidan Gauland <wgsilkie@...>
Subject: Re: Image Sequences-why not suitable?
To: "Content creation for the Pipmak Game Engine" <pipmak-users@...>
Date: Thursday, September 10, 2009, 4:28 PM

James Wilson wrote:
> Really? Interesting. I rendered a 1024x1024 video, encoded it to 85% quality JPEG, and set it up in Pipmak. It worked fine, and ran on the intended 15 FPS. And my PC is fairly old, 1.9 GHz.

Do you mean a sequence of JPEG images, or is there some way of making an
animated JPEG that I don't know about? I thought that JPEG was only for still
images.

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