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add rendering notes #1679

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Dec 13, 2023
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add rendering notes #1679

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add rendering notes
meshula Nov 16, 2023
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Update docs/tutorials/otio-timeline-structure.md
meshula Dec 7, 2023
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Update docs/tutorials/otio-timeline-structure.md
meshula Dec 8, 2023
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20 changes: 20 additions & 0 deletions docs/tutorials/otio-timeline-structure.md
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Expand Up @@ -5,6 +5,26 @@ clips, gaps, and transitions. This document is meant to clarify how these
objects nest within each other, and how they work together to represent an
audio/video timeline.

## Rendering

Rendering of the image tracks in a timeline is done in painter order. The layers
in a stack are iterated from the bottom (the first entry in the stack) towards
the top (the final entry in the stack). Images in a stack overlay lower images
with no blending.
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Within a track, clips may overlap via a transition. In that case, the
contribution of track is the linear blend of the elements joined by the
transition.

If there are effects on a clip, OpenTimelineIO does not say anything about the
impact of the effect and deviation from the base behavior is application
specific.

Rendering of the audio tracks is additive. It is strongly advised, but not
required, that the summed audio is summed as floating point, and that it is
processed through a compression filter in order to prevent clipping and
distortion.

## Simple Cut List

Let’s start with a simple cut list of a few clips. This is stored as a
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