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brettg50465725
brettg50465725
Participant
June 5, 2018
Answered

Rotobrushing and freezing

  • June 5, 2018
  • 1 reply
  • 3542 views

Hi all,

I learning how to use the Rotobrush tool and have a few questions.

I've rotobrushed my selection and go to freeze the selection but it takes a long time.

Here is some info on the comp I am working on:

1. source file is 1GB in size

2. I rotobrushed the whole 3:19 clip.

Based off this and my own research

a - It is slower since I rotobrushed the entire video?

b - the source file is very large so it slows down render times?

c - freezing selection takes a long time in general.

I have been searching and figuring out what adjustments to make so this can render quicker?

Thanks

    This topic has been closed for replies.
    Correct answer Mylenium

    There is nothing to make it quicker. Use it or lose it. That's jsut how it is. over 3 minutes is awfully long for a roto clip, anyway. It's perfectly normal that it will produce a ton of data and that looking up that data for each frame will cause delays. No different than scrubbing through other large, uncompressed video files that have tens of gigabytes of data. Again, perfectly normal. Just get used to it.

    Mylenium

    1 reply

    Mylenium
    MyleniumCorrect answer
    Legend
    June 6, 2018

    There is nothing to make it quicker. Use it or lose it. That's jsut how it is. over 3 minutes is awfully long for a roto clip, anyway. It's perfectly normal that it will produce a ton of data and that looking up that data for each frame will cause delays. No different than scrubbing through other large, uncompressed video files that have tens of gigabytes of data. Again, perfectly normal. Just get used to it.

    Mylenium

      brettg50465725
      brettg50465725Author
      Participant
      June 13, 2018

      Thank you.  In regards to this same clip, Below are steps taken to get end result so far:

      Goal is to Mask out an object in background the talking head moves in front of throughout the video.

      1. I only rotoscoped the frames the talking head moves in front of the object. 

      2. I inserted a new image/object between the base layer and roto layer to cover background object.

      3. I froze the rotobrush and the mask looks pretty good.  When rendering out and playing back the image/object only appears with frames that were rotoscoped.

      Question is:  do I still need to roto the entire clip?  I figured placing an object between two layers would work similar to premiere that it should be visible throughout the entire clip regardless if those frames were rotoscoped or not?

      Roei Tzoref
      Roei Tzoref
      Legend
      June 13, 2018
      Question is:  do I still need to roto the entire clip?

      no, if the object is not overlapped by the rotoscoped object then no reason to do that.

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