@omnimedia/omnitool/x/timeline/renderers/export/parts/produce-video.js

open source video processing tools

import { CursorVisualSampler } from "./cursor.js";
import { fixedStep } from "../../parts/schedulers.js";
import { computeItemDuration } from "../../parts/handy.js";
export function produceVideo({ timeline, fps, driver, resolveMedia, }) {
    const stream = new TransformStream();
    const writer = stream.writable.getWriter();
    const sampler = new CursorVisualSampler(driver, resolveMedia, timeline);
    const dt = 1 / fps;
    const duration = computeItemDuration(timeline.rootId, timeline);
    async function produce() {
        await fixedStep({ fps, duration }, async (timecode, i) => {
            const layers = await sampler.next(timecode);
            const composed = await driver.composite(layers);
            const frame = new VideoFrame(composed, {
                timestamp: Math.round(i * dt * 1_000_000),
                duration: Math.round(dt * 1_000_000)
            });
            await writer.write(frame);
            composed.close();
        });
        await writer.close();
    }
    produce();
    return stream.readable;
}
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