Challenge 3: Why Rendering to Individual Frames Is Safer Than One Video File — Solution Walkthrough

The answer:

Per this chapter's own material, rendering to individual frame images
first is generally the safer choice for a longer animation, since a
crash partway through only loses whatever frames hadn't rendered yet,
rather than the entire in-progress video file.

Why a single video file is riskier for a long render:

If rendering directly to one continuous video file and the process is
interrupted partway through — a crash, a power loss, needing to stop
early — the entire video file can be left incomplete or corrupted,
potentially losing every frame that had already been rendered, not
just the ones still remaining.

Why individual frame images avoid this problem:

Each rendered frame is saved as its own separate, complete file the
moment it finishes. An interruption partway through only means the
remaining, not-yet-rendered frames are missing — every frame that
already finished stays safely saved on disk, ready to be compiled into
a final video once the rest are rendered, or resumed from that point
rather than starting over from frame one.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that individual-frame rendering's own safety
advantage is correctly traced back to each frame being saved
separately, protecting already-completed work from an interruption
partway through a long render.