ETC.lua

-- Crop mode toggle   

-- Toggle between 3x crop mode

require('config')

-- end this script if not eosm
if camera.model_short ~= "EOSM" then
    display.notify_box("Script not working on this cam");
    msleep(2000);
    return
end
    
-- warnings 
while camera.mode ~= MODE.MOVIE do
    display.notify_box("enable MOVIE mode");
    msleep(1000);
end

function toggle_x3crop()
    -- console.show();
    local recording = movie.recording;

    if recording == true then
        display.notify_box("STOPPED RECORDING");
        movie.stop();
    end

    -- crop mode
    if menu.get("Crop mode", "x3crop") == "x3crop" then
        display.notify_box("DISABLED X3CROP");
        menu.set("Crop mode", "x3crop", 0);
    else
        display.notify_box("ENABLED X3CROP");
        menu.set("Crop mode", "x3crop", "x3crop");
    end
    
    lv.pause();
    lv.start();
    
    if recording == true then
        local max_tries = 40

        while max_tries > 0 do
            max_tries = max_tries - 1
            
            msleep(100)
            movie.start();
            
            if(movie.recording == true) then
                display.notify_box("RESTARTED RECORDING");
                break
            end
        end
    end

end

x3crop_toggle_menu = menu.new
{
    parent      = "Movie",
    name        = "x3crop toggle",
    help        = "Pick a button to toggle x3crop in mv1080.",
    value       = 0,
    submenu     =
    {
        {
            select  = function(this)
                if x3crop_toggle_menu.value == 0 then
                    x3crop_toggle_menu.value = 1;
                else
                    x3crop_toggle_menu.value = 0;
                end
            end,
            update = function(this)
                if x3crop_toggle_menu.value == 0 then
                    this.name = "Enable";
                else
                    this.name = "Disable";
                end
            end,
        },
        {
            name    = "Button",
            choices = { "SET", "INFO", "HALFSHUTTER"},
        }
    },
    update = function(this)
        if this.value == 0 then
            this.help2 = "Click Enable in submenu to activate.";
            return "OFF";
        else
            this.help2 = ""
            return "ON, " .. this.submenu["Button"].value; 
        end
    end,
};

config.create_from_menu(x3crop_toggle_menu)

event.keypress = function(key)
    if key == KEY[x3crop_toggle_menu.submenu["Button"].value] and menu.visible == false and x3crop_toggle_menu.value ~= 0 then
        task.create(toggle_x3crop);
        return false;
    end
end

console.hide();

Should now restart movie recording more or less as quick as it can when you toggle x3crop while recording.