New guy...(clueless) - General Help and Assistance on using CHDK stable releases - CHDK Forum
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New guy...(clueless)

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Offline macewindu

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New guy...(clueless)
« on: 11 / January / 2008, 09:44:19 »
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Hi there,
Ive had my canon s3 for about 9 months and by now im looking to upgrade it a little. Looks like theres some great software here and i plan on downloading it.
However i have enough  knowledge about computers to do what i need to and enough curiousity to screw up my registry (quicktime and macromedia nolonger work). That said, some of the technicallites here are kind of confusing.
I bought my s3 primarily for its video functions and when i saw the 1gb wall has been overcome, i was thrilled. I'd also like to increase the already good quality of the video. So heres the question:

1.Under some "build" i noticed that you can change video quality from 1-99 (where the original quailty was like 86). What does that mean? Is that more FPS, Resolution greater than (640x480), what does that mean?
2. What is video bitrate? (FPS, Resolution, Mb/s...?)
cheers...
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Offline GrAnd

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Re: New guy...(clueless)
« Reply #1 on: 11 / January / 2008, 10:44:30 »
http://chdk.wikia.com/wiki/CHDK_firmware_usage#Special_Build_Features

Quote
Video Mode = Bitrate, Quality

    Choose between 2 video compression schemes. Selecting the Bitrate option will use the Bitrate settings, selecting the Quality option will use the Quality settings. See the downloads discussion page EWAVR's VideoPlus Version, for more elaboration on this. Options of Quality, and Quality setting of 1X are the camera's native default compression.

Video Bitrate = 0.25x, 0.5x, 0.75x, 1x, 1.25x, 1.5x, 1.75x, 2x, 2.5x, 3x

    A Variable Bitrate (constant quality) compression. The size of your video file will change depending on the image content. The more detail and motion in your video, the larger the file-size. The camera default is 1x.

Video Quality = 1 to 99

    A Variable Quality (constant bitrate) compression. Every video file will have the same size for the same duration, but it won't compensate for changing image details. Useful when needing the absolute highest compression (least quality), the absolute best in quality (least compression), or when needing to fit a video duration within a certain file-size. A value of 70 to 75 is about the same compression/quality as the camera's own. A value of 10 is the same as GrAnd's original HiCompressed Movie option (to give you an idea of the image-quality/compression latitude available now).

    When using some of the high-quality settings, VB = 2x to 3x, or VQ = 93 or higher, be sure to use the fastest memory card available. These options easily reach data-rates of 6MBs or more, overwhelming the camera's buffer and/or card-speed. If your camera allows, and you absolutely need the best video quality available, it will help to choose lower audio-quality settings to offset the more massive amount of data being saved in the ultra-high quality video.
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Offline macewindu

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Re: New guy...(clueless)
« Reply #2 on: 11 / January / 2008, 12:49:43 »
Thx, but i did see that already. Is the video bitrate (constant quality) in terms of FPS or screen Resolution or what?
And for better video quality (constant bitrate), is that better in terms of FPS or Screen Res...
cheers
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Offline GrAnd

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Re: New guy...(clueless)
« Reply #3 on: 11 / January / 2008, 13:15:27 »
The bitrate is the "bit rate". It does not correspond with FPS or Resolution. It's measured in (Giga, Mega, Kilo)bits per second.
Constant bitrate
Variable bitrate
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Offline GrAnd

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Re: New guy...(clueless)
« Reply #4 on: 11 / January / 2008, 13:26:42 »
Quote from: Woodsman on 11 / January / 2008, 13:16:39
Next time in Wiki edit mode, someone remind me to add those links to all the Firmware Usage and video discussion areas. :-)
I've added them to the Firmware Usage page.
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