TimeLapse and auto exposure

Discussion in 'Yi Action Camera' started by StfLA, Aug 6, 2015.

  1. StfLA

    StfLA Member

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    Hi !

    I play with my Yi since a few days. It's awesome to get this quality for such a low price.
    My goal is to use it for taking pictures in car or on bicycle in timelapse mode, and use them to contribute for OpenStreetMap and Mapillary.

    My first problem is that the timelapse mode sets the iso and shutter speed for the first picture and keep these settings even when the light change.
    If I start the timelapse in a dark place and move to a sunny place, the pictures are all white.

    So is there a script or something other to start a Timelapse with unlocked AE ?
     
  2. Tokra

    Tokra Member

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    probably possible with a script in loop.. but dont ask me how to do it.. not sure. maybe someone here has done it or knows how to do it.. if there is option to check AE , you could possible put it in loop and test it.. means, you turn on camera and thats it.. script would go in loop and do it all
     
  3. StfLA

    StfLA Member

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    It's ok with this script :
    Code:
    sleep 10
    #convert sleep to milliseconds hack
    #writew 0xC0155712 0x0000
    #MAIN LOOP
    while true
    do
    t app key shutter
    sleep 1
    done
    You just have to select standard photo mode as default boot mode before inserting the sdcard and reboot the Yi

    The sleep to milliseconds hack doesn't work, so I've added '#' in front of the line.
    If someone knows a working millisecond hack..
     
  4. StfLA

    StfLA Member

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    Strangely, AutoExposure is off for a Timelapse with 0.5 and 1 seconds interval, but enabled with a longer interval.
    I've put a cloth on the camera, start the timelapse, then remove the cloth :

    Xiaomi Yi - Timelapse comparaison.jpg

    Both mode are useful, depending on what you want to do, but you can't choose... :-(
     
  5. StfLA

    StfLA Member

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    I've found a working millisecond hack somewhere on github (firmware 1.2.13):
    #millisecond hack
    writew 0xC0176C5A 0x0000

    But the loop was crashing too often.
    I tried to run the loop with an external script to try to find what cause the crash and I don't know why.... but it doesn't crash anymore.

    My autoexec.ash is :
    Code:
    sleep 10
    # CALL LOOP
    d:/loop.ash
    
    and the loop.ash contains :
    Code:
    #FAST PHOTO TIMELAPSE
    #millisecond hack
    writew 0xC0176C5A 0x0000
    
    while true
    do
    t app key shutter
    sleep 100
    done
    
    With a key shutter press each 100ms, the timelapse speed is about 1.1s per pictures (8MP). Now I need to find a way to get a more accurate capture time.
     
  6. Dimitrios

    Dimitrios New Member

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    And this is why you can never compare this to the GoPro. I had the GP 3 Black until it wouldn't start up anymore unless I put it in the freezer first--I guess 5 years of use took its toll. Not being able to set the exposure to auto unless it's 2 seconds is absurd and the product of a cheaply made knockoff. This was driving me crazy when many of my picts were washed out. Now I know. Well, the GP 6 will be out this year so I guess it's back to that for me--enough of trying to find workarounds for the GhettoPro.

    Thanks for the picts--they really helped.
     
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