Rendering make a new copy of that section of the timeline with and effects added burned in, so if you make any changes to either the length or any effects, the render files need to be remade.
Any change that u made in your timeline needs RENDER again, this is normal,
since by minimum it is the change affects to all the clip.
Thanks Richard - could you clarify a bit further?
Could I nest the whole sequence and then use the nested sequence? Or if I have effects on the clips should I nest those individual clips. In my current project all effects are directly applied to the clips, not adjustment layers, so I don't know how I could "burn in" those effects without exporting the sequence and re-importing which I don't want to do at the risk of losing quality.
I also am really after why this is happening to help avoid it as opposed to a quick fix.
Thanks Harold - but this doesn't happen on all projects. Sometimes clips turn yellow instead of red and you can playback. Do you know why this happens?
So I have seen this article and understand changes that I make to a clip will make playback slower and show a red bar.
I just can't understand why some projects struggle to playback while others don't and on different computer systems the timeline will show as yellow instead of red. The other computer systems are either comparable in computer specs or my laptop which should have a harder time with playback.
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The other computer systems are either comparable in computer specs or my laptop which should have a harder time with playback.
Comparable, but not exactly the same. There are many factors that affect the need for rendering, including processes running in the background.