Odd video dimensions: Sume Timeline output takes even sizes 256-2160

Sume's Timeline 1.0 takes output.width and output.height as even integers between 256 and 2160. YouTube's encoding page recommends H.264 with 4:2:0 chroma, which stores colour at half resolution, so even dimensions are the safe choice. Pick sizes from the platform's minimum, not by hand-cropping to odd pixel counts.

What the platform pages say

YouTube's "recommended upload encoding settings" (read 2026-10-05) lists H.264 High Profile with 4:2:0 chroma. TikTok's In-Feed page (read 2026-10-05) lists minimum sizes of 540 by 960, 960 by 540 and 640 by 640. Every number there is even.

What Sume does

Timeline 1.0 rejects values outside the range or odd values at the request step; run POST /v1/timeline-1.0/plan to find out for free. The default is 1080 by 1920. In video-filter, crop fractions are rounded to even sizes for yuv420p, as the docs note.

If you want a 9:16 frame at another size, work from the width: pick an even width and compute the height as width times 16 over 9, then round to an even number and check the drift.

for w in (540, 720, 1080):
    h = round(w * 16 / 9 / 2) * 2
    print(w, h)

Common sizes

The values below are all even and fit the Timeline range.

Check

After a render, run video inspect to confirm the dimensions, then compare with the page. Do not scale after rendering unless you must; re-encoding twice costs quality.