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 gregthecanuck
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Re: Screen Capturing Application Bounty
Posted on 12-Jan-2012 0:43:12
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Cult Member
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Joined: 30-Dec-2003
Posts: 846
From: Vancouver, Canada | | |
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| @broadblues
Quote:
SRec is not slow. Encoding video on the fly is a highly demanding activity. If you choose realistic values for the frame rate and video size you can get a decent video at only 25% CPU on a Sam-Flex 733. No program whatsoever will encode a full HD screen at 30 frames a sec or what ever other unrealistic expectation people have.
The same issue is experineced on linux, with the various options available there, and no doubt on windows.
Small improvements are possible perhaps by saving the raw data stream, and then encoding afterwards, but file temporary size rapidly get out of control with that approach. |
Perhaps a compromise? Do a very basic run-length encoding when saving the raw stream? Then on a second pass do the final encoding? |
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Hans
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Re: Screen Capturing Application Bounty
Posted on 12-Jan-2012 0:58:59
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Elite Member
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Joined: 27-Dec-2003
Posts: 5067
From: New Zealand | | |
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Broadblues wrote:
Well 1240 * 1024 * 4 * 25 (width * height * depth * fps) = 126976000 or 126Mb/s that's alot of bytes to write to a drive unless you have some striped raid array setup, which isn't supported on amigaos. So even with RAW you need to be conservative with your choice of video dimension and frame rate. |
Since we currently don't have DMA/GART support for transferring graphics from the graphics card, you won't even be able to copy the data off the graphics card that fast. So, all CPU time is already used up before it even gets to encoding or writing to disk. Before anyone asks, it's on the to-do list already.
Hans
_________________
http://hdrlab.org.nz/ - Amiga OS 4 projects, programming articles and more. Home of the RadeonHD driver for Amiga OS 4.x project.
https://keasigmadelta.com/ - More of my work.
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djrikki
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Re: Screen Capturing Application Bounty
Posted on 12-Jan-2012 10:05:24
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Elite Member
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Joined: 22-Jun-2010
Posts: 2077
From: Grimsby, UK | | |
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| I wasn't gonna ask, that is great news, gfx card support and a little tool to record with. Nice to know things are moving in the right direction.
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Tuxedo
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Re: Screen Capturing Application Bounty
Posted on 12-Jan-2012 13:23:02
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Elite Member
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Joined: 28-Nov-2003
Posts: 2341
From: Perugia, ITALY | | |
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| @Hans
only one thing...GART was planned to be available for all AmigaOS users or only for RadeonHD users?
@thread
IMHO the best choice was to contact Salas and ask him to improve SRec with a nicer GUI Eand functioanlity...
Why waste that good work?
@kas1e
thank you!
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Simone"Tuxedo"Monsignori, Perugia, ITALY.
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Hans
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Re: Screen Capturing Application Bounty
Posted on 12-Jan-2012 20:08:57
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Elite Member
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Joined: 27-Dec-2003
Posts: 5067
From: New Zealand | | |
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| @Tuxedo
Quote:
@Hans
only one thing...GART was planned to be available for all AmigaOS users or only for RadeonHD users? |
GART has to be implemented on a per-graphics driver basis. Personally, my plans are for the RadeonHD driver, but I'm sure that there are plans for older Radeon cards too.
Hans
_________________
http://hdrlab.org.nz/ - Amiga OS 4 projects, programming articles and more. Home of the RadeonHD driver for Amiga OS 4.x project.
https://keasigmadelta.com/ - More of my work.
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Tuxedo
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Re: Screen Capturing Application Bounty
Posted on 12-Jan-2012 20:44:57
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Elite Member
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Joined: 28-Nov-2003
Posts: 2341
From: Perugia, ITALY | | |
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| @Hans
thank you for reply!
keep up good work!
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Simone"Tuxedo"Monsignori, Perugia, ITALY.
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