Will Override Shutter/ISO or Aperture ever be enabled in Movie Mode?

[vit40]

Yes, A620

[ewavr]

Test version with AF support in video recording here - http://ewavr.nm.ru/chdk/for_test/ - for A-series, G7 and TX1 (w. src.).

@wap4
edit:
Confirmed on A650 (also DRYOS) - ExpCtrlTool_StartConti() function crashes the camera.

[a710is]

you've even done the muting during refocusing. respect and big thanks ewavr

[Stimpy]

I tried the test version on my A640, & it works great! Cheers Ewavr!
I notice that when engaging the auto focus while recording that the camera will "gain up" to max ISO - this is also recorded onto the movie clip, any way around this?

Is it possible you can implement a similar system in the menu for AElock, ie you can assign this to the "Up" key....?

[dzsemx]

on a630 everything works fine with autofocus in video

[wap4]

@wap4
edit:
Confirmed on A650 (also DRYOS) - ExpCtrlTool_StartConti() function crashes the camera.

Thanks ewavr for finding out alternative functions that control exposure in dryos cams without crashing.
Anyone interested may see Changeset 426 - chdk - Trac . Now I think I can fulfill my wish without crashing the camera.

A little offtopic query here:- How do you find that a sub is void or it takes some arguments ?

Edit: I've been successful at last in locking exposure by changing the MakeAFscan() function (experimentally) in wrappers.c
as follows:-

void MakeAFScan(void){
 _ExpCtrlTool_StopContiAE(0,0);
}

as simple as that!
 

[ewavr]

So, answer for subject question is 'yes':

ExpCtrlTool_StopContiAE();
short tv=96*2;
SetAE_ShutterSpeed(&tv);

sets frame exposure speed to 1/4 sec, capture speed also changes (1" on display ~ 5" real time ). Playback speed, of course, is unchanged (30 fps) - we have time-lapse movie in camera

Another functions (derived from SetAE_CdsGainValue, can be found on strings "SetCDSGainApex" and "SetPgaGain") allow change ISO during video recording. Of course, AE must be turned off before call it (ExpCtrlTool_StopContiAE).

[Stimpy]

Thanks for the great news Ewavr!
I was about to post a feature request for Timelapse in movie, but it looks like you've already cracked it!
Great work!

[ewavr]

Well, experimental build (Allbest based) for most A-series cameras with Ev correction in video here (with src.)
When video is recorded, press "+/-" ("disp" for cameras without "+/-") key. Exposure is locked and you can use <- and -> keys to adjust it (0.5 Ev step, Ev display present on screen). Press "+/-" again to exit this mode; after optical zooming or refocusing this mode disables automatically.
Unfortunately, positive Ev correction is available only in bright environment (in this version CHDK can change only exposure time, not aperture or ISO).

[PS]

Unfortunately, positive Ev correction is available only in bright environment (in this version CHDK can change only exposure time, not aperture or ISO).

What is the slowest shutter speed available then? Is it 1/x sec. for x fps movies?

[ewavr]

What is the slowest shutter speed available then? Is it 1/x sec. for x fps movies?

Original firmware in A710 sets maximal exposure time in video 1/30s (PROPCASE_TV  = 480) for 30 and 15 fps, 1/60s (PROPCASE_TV  = 577) for 60 fps. But we can set 1s (1 fps) or more...  (not in this release).

[jcm]

I have the SX100 IS and when not in CHDK mode I like the movie mode exposure lock, enabled with the Up arrow. I can enable this even in CHDK mode, but when I half press the shutter key for the AF feature (that's excellent) the exposure lock goes out and the rest of the clip the exposure becomes in continuous adjusting.  Does the script have some code for make also a exposure unlock? And, in the case of exposure Lock, is it possible to make some adjust to the exposure when zoom in or zoom out, in order to compensate the lost or gain of luminance when the zoom is applied.

 

[Stimpy]

Well, experimental build (Allbest based) for most A-series cameras with Ev correction in video here (with src.)
When video is recorded, press "+/-" ("disp" for cameras without "+/-") key. Exposure is locked and you can use <- and -> keys to adjust it (0.5 Ev step, Ev display present on screen). Press "+/-" again to exit this mode; after optical zooming or refocusing this mode disables automatically.
Unfortunately, positive Ev correction is available only in bright environment (in this version CHDK can change only exposure time, not aperture or ISO).

Thanks Ewavr for adding the movie mode exposure lock, I use this function all the time on my A640.

Does the current version of CHDK allow the control of Aperture and ISO in Movie mode yet?
I'd love to be able to lock in the ISO at 80, shutter at 1/30th and adjust the aperture on the fly according to the brightness of the environment.

[emutier]

is there a way to make this exposure lock work on the S95 ?

edit: solved - if you preselect the exposure via EV, it is locked.