46 lines
1.4 KiB
TypeScript
46 lines
1.4 KiB
TypeScript
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import { spawn } from "node:child_process";
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const FFMPEG = process.env.FFMPEG_PATH ?? "ffmpeg";
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const FFPROBE = process.env.FFPROBE_PATH ?? "ffprobe";
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/** Run ffmpeg with the given args; rejects with the tail of stderr on non-zero exit. */
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export function runFfmpeg(args: string[]): Promise<void> {
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return new Promise((resolve, reject) => {
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const proc = spawn(FFMPEG, args, { stdio: ["ignore", "ignore", "pipe"] });
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let stderr = "";
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proc.stderr.on("data", (d) => {
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stderr += d.toString();
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});
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proc.on("error", (err) =>
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reject(new Error(`Failed to spawn ffmpeg (${FFMPEG}): ${err.message}`))
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);
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proc.on("close", (code) =>
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code === 0 ? resolve() : reject(new Error(`ffmpeg exited ${code}: ${stderr.slice(-600)}`))
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);
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});
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}
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/** Probe an audio file's duration in whole seconds, or null if ffprobe is unavailable. */
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export function ffprobeDuration(file: string): Promise<number | null> {
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return new Promise((resolve) => {
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const proc = spawn(FFPROBE, [
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"-v",
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"error",
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"-show_entries",
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"format=duration",
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"-of",
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"default=noprint_wrappers=1:nokey=1",
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file,
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]);
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let out = "";
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proc.stdout.on("data", (d) => {
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out += d.toString();
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});
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proc.on("error", () => resolve(null));
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proc.on("close", () => {
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const n = parseFloat(out.trim());
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resolve(Number.isFinite(n) ? Math.round(n) : null);
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});
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});
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}
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