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Diary of a Yak Shaver - Skill Building
  • The reality of an independent film maker is -- 'it's always harder than it looks'!

    How many times do we watch a scene and think - they're lazy - I can do that, it's just package/tool/software/technique.

    I find myself thinking the same thing, then I try to get the same results (of course with a lot less resources). Then I find this stuff is hard!

    It's not the same as photography, where getting professional results is so much easier. With video it's a case of the weakest link is the one that stands out most. For example you get a great chroma key and you're really proud of the blend on the hair line - then you notice that yellow logo has become a brown logo.

    I thought I'd use this post to document some the processes that I'm going through in order to build skills, sometimes a video on PV just unlocks an idea - other times it's a five hundred hour journey. This is where Yak shaving comes in, you set out to do a specific thing, but along the way you end up going down so many sub-tasks that one of them is bound to be shaving a yak.

    I'll start with Camera Tracking. So far I've put about 20 hours in, including grabbing various clips to experiment on. Of course it's not just the tracking but the integration of the new objects afterwards.

    Anyway, here's the very first attempt:

    It's 12 seconds and it's rubbish, but it's enough for me to learn about:

    • setting up the tracking points
    • what a point cloud is and why some points are pointless
    • setting the camera parameters to give the tracker a lock onto the physical measurements
    • setting up and moving the ground plane
    • making the ground plane invisible (and later making just the shadow of the object visible)
    • adding an object in the 3D space
    • solving, re-solving (*N) and exporting the rigs

    But perhaps mostly, so far it has taught me that long clips are a double extra triple piggy to track.

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  • Yesterday, the Beta6 of Resolve15 was released. It seems that this version is faster and more stable. I've just done a couple of hours without a single crash.

    It also means that the cycle time is faster, so more chances to find the right settings.

    The big news here is that I finally got a solve that was below 1 pixel error (0.8) so far the best I'd managed was 8 pixels.

    Here's some screenies:

    Screen Shot 2018-07-06 at 19.20.09.png
    760 x 626 - 84K
    Screen Shot 2018-07-06 at 20.02.05.png
    1170 x 764 - 512K
    Screen Shot 2018-07-06 at 20.06.20.png
    644 x 248 - 31K
  • And here's the rendered video:

    From the screenies above you can see that getting the perspective right is going to be an issue. The back plate is not at infinity. The sphere can't really go past the back plate (or can it -- will have a go shortly!).

    Now I'm beginning to see which shots will work with this approach.