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Hi,

After video_av.mo I will do a module to make it easier to focus while video shooting in various situation.

Here are the functionalities that I would want for my module:

1)Make Canon's auto-focus remotely controlled/triggered (useful for selfie video).
2)Display focus value while recording to assist manual focus: a number that corresponds to the focus distances (Useful to note good focus distance in x10 mode and then navigate through them with manual focus, while recording.
3)Display focus indicator (a number) while recording to assist manual focus: a number that tells how well we are in focus, in a certain zone.
4)Have a user-guided follow object auto-focus mode (user specifies direction with keys, the machine goes in that direction as much as necessary to have a good focus).

Do you have any comment on feasibility, or can you help me if you know how to:
1)Trigger canon's AF from code.
2)Get an indication of manual focus state (  a number that corresponds to the focus distance )
3)An indication of how well we are in focus in a certain zone (possibly canon's zone).

Thank's a lot!

[Edit:] code of the module: https://github.com/pparent76/ML_video_av

Hi,

I'm in the process of developing a video_av_expo module. Basically it will allow to have a fixed aperture in video mode but adapt dynamical shutter speed and iso to get a good exposure.  Iso will allawys be set to its lowest possible value, and will only be increased if shutter speed is at its minimum.

I sounds like a pretty easy module, but I'm having a problem with a basic thing that is blocking me: I can't get proper exposure estimation.  Canon av value is not processed in video mode (500D) . So I tried to use auto_ettr_get_correction() but it fails to work because raw_hist_get_percentile_levels fails because raw_update_params() returns 0. No idea why...

For now I've started my tests by modifying autoexpo module, but I will write a clean module as soon as it works properly.

How can I get exposure estimation in video mode in a module?

Any help appreciated!

Hi,

I see several improvements that could be done to have a more complete video mode in 500D (from easiest to hardest):

1)Allow to change aperture without needing to go physical through all values ( to go from 2 to 3 you need to go through 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9).
2)Av Semi-automatic exposure before shooting the scene and lock it for the scene.
3)Av Semi-automatic exposure dynamic and adjusting smoothly while filming.
4) Make canon auto-focus remotely controlled/triggered (useful for selfie video).
5) Display focus indicator (a number) while recording to assist manual focus.
6) Have a user-guided follow object auto-focus mode (user specifies direction with keys, the machine goes in that direction as much as necessary for focus).
7)Find a way to get full HD@24 fps (maybe using jepg re-compressed raw)

I'm a developer and I will try to see theses things.

If you have any thought on that It would be welcome!