Canon CHDK - Manual (Page 17)

Video Parameters
< Main Menu
Video Mode [ Bitrate or Quality ]
Video compression modes.
Bitrate – dictates a constant data rate.
Video compression (and hence, video quality) expands or
contracts as necessary to maintain the data rate constant.
Quality – Sets a constant compression level, ensuring a defined level of quality regardless of
how much data that level requires.
Note: From owners reports of testing Quality overrides, it is evident that settings above the
standard Canon setting gain little if any higher quality, however file sizes will increase
significantly. Lower settings (minor), will lose little in quality but will reduce file size.
Excess Bitrate and Quality settings can cause memory buffer overload, and stop
recording, a red
!
will show on the OSD.
Video Bitrate [ 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.5, 3 ]
The compression factor for Bitrate compression. 0.25 is the most compressed /least quality and
3 is the least compressed / best quality.
Video Quality [ 1 - 99 ] < Video Parameters < Main Menu
The compression factor for Quality compression. 1 is the most compressed / least quality and 99
is the least compressed / best quality. (Roughly ~70 - 80 is Canon equivalent).
Clear Video Params on Start? Enable [•] / Disable [ ]
When enabled this will clear all your custom video compression settings back to the camera's
own defaults on startup.
Fast Video Control Enable [•] / Disable [ ] < Video Parameters
Only a few cameras are supported. Pause and unpause video by pressing LEFT / RIGHT while
recording. Note: When using this function the remaining video-record time calculation is reset,
so the change is shown immediately in the OSD.
Video Quality Control ?
Enable [•] / Disable [ ]
When enabled, using the UP / DOWN button will increase or decrease video quality or
bit-rate (depends on which one is enabled in the Video Mode override) - While you are
recording.
Enable Optical Zoom Enable [•] / Disable [ ] < Video Parameters
This feature allows you to use the camera’s optical zoom during video recordings.
Mute During Zooming Enable [•] / Disable [ ]
To eliminate focus mechanism noise. Please note that the zoom mechanism sound is very loud in
video, which is probably why it was disabled by the manufacturer.
AF key < Video Parameters < Main Menu
(Shutter button - half press, or FUNC.SET button) During video recording - camera makes a
single autofocus scan.
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