Magic Lantern Forum

Using Magic Lantern => General Help Q&A => Topic started by: tmcdanel on October 15, 2014, 05:36:33 PM

Title: Possible to change video file prefix from MVI or IMG?
Post by: tmcdanel on October 15, 2014, 05:36:33 PM
Right now it is set for MVI so all file names look like this: MVI_0289.MOV

Can i change this?
to something like MVA to give MVA_0289.MOV

How about with jpegs?
Currently it is saving: IMG   So files are named IMG_0243.jpg
Can i change it to IMA to get  IMA_0243.jpg

How about on the T5i?

The reason i am asking is i use two cameras, a T3i and T5i, and i want to clearly distinguish the products of the two cameras.
Title: Re: Possible to change video file prefix from MVI or IMG?
Post by: dmilligan on October 15, 2014, 06:19:10 PM
There is a function in the Canon firmware that lets you change the file prefix, but it's somewhat unreliable. Why not just use the metadata?
Title: Re: Possible to change video file prefix from MVI or IMG?
Post by: tmcdanel on October 19, 2014, 09:39:54 PM
DMiligan, thanks for the reply. To answer your question, the metadata is stored in the file's resource fork on a Mac. I can look at it with GraphicConverter, which is what use for sorting but it is not handy.

A designation in the file name would be much handier. Your answer "There is a function in the Canon firmware" does not indicate how to try this function. Are you saying it is in the standard menu?
On both T3i and T5i?

I assume that ML does not address this.
Title: Re: Possible to change video file prefix from MVI or IMG?
Post by: 1% on October 19, 2014, 10:22:06 PM
I've never seen it for video but for photos dual_iso can do this in ML right now(it misses some), there should be a custom string option in the canon menus as well, but it does ALL images. I personally use it for bracketed shots, as written by a1ex (1 or 2 years ago) with some updates to keep it current with ML changes. Imho it was very reliable with the advanced bracketing and should come  back to mainline.
Title: Re: Possible to change video file prefix from MVI or IMG?
Post by: dmilligan on October 19, 2014, 11:10:17 PM
Any decent photo catalog/workflow program (Lightroom, iPhoto, darktable, Aperture, Bridge, etc.) should let you sort/view/filter/etc based on any metadata (camera, lens, expo settings, rating, etc.). If you're not using such a program to manage your photo library, you should be. I don't ever care or even really see what files are named as I import, edit, and manage photos entirely within Lightroom.

Your answer "There is a function in the Canon firmware" does not indicate how to try this function.
see fileprefix.c/h (https://bitbucket.org/hudson/magic-lantern/src/a27e3b9df491d1bfa2cba70def5fb873486980e1/src/fileprefix.c?at=unified)
Code: [Select]
/* only one module (task, whatever) can set a custom prefix; all other requests will be denied */
/* returns a "key" with which you can restore the file prefix (so it won't get restored by mistake) */
int file_prefix_set(char* new_prefix);
(this function is just a ML wrapper around a Canon property: PROP_FILE_PREFIX)