Fix still-image encodes ending ~50s past audio and refresh support/docs links.

Cap FFmpeg output with probed audio duration (FFmpeg 5.x -shortest bug), point SUPPORT_EMAIL to support@songs2vid.com, and align Hub/README/n8n docs with the Gitea + npm package links.

lib/ffmpeg/encode.ts

@@ -2,6 +2,7 @@ import { spawn } from "child_process";
 import fs from "fs/promises";
 import path from "path";
 import ffmpegStatic from "ffmpeg-static";
+import { parseFile } from "music-metadata";
 import { getVideoAttributionText } from "../branding";
 import { getResolution } from "../constants";
 import {
@@ -38,6 +39,20 @@ function getFfmpegPath(): string {
 
 export { getFfmpegPath };
 
+async function getAudioDurationSeconds(audioPath: string): Promise<number> {
+  const { format } = await parseFile(audioPath);
+  const duration = format.duration;
+  if (typeof duration !== "number" || !Number.isFinite(duration) || duration <= 0) {
+    throw new Error(`Could not determine audio duration for ${audioPath}`);
+  }
+  return duration;
+}
+
+/** FFmpeg 5.x mishandles `-shortest` with `-loop 1` still inputs (adds ~50s tail silence). */
+function formatOutputDurationSeconds(seconds: number): string {
+  return Math.max(0.01, seconds - 0.02).toFixed(3);
+}
+
 async function fileExists(p: string): Promise<boolean> {
   try {
     await fs.access(p);
@@ -196,6 +211,10 @@ export async function encodeVideo(options: {
 
   await fs.mkdir(path.dirname(options.outputPath), { recursive: true });
 
+  const outputDurationSec = formatOutputDurationSeconds(
+    await getAudioDurationSeconds(options.audioPath),
+  );
+
   const settings = normalizeWatermarkSettings(options.watermark, options.includeWatermark);
   const layoutSettings = options.layout
     ? normalizeLayoutSettings(options.layout)
@@ -269,7 +288,8 @@ export async function encodeVideo(options: {
     );
     pushAudioEncodeArgs(args, audioEncode);
     args.push(
-      "-shortest",
+      "-t",
+      outputDurationSec,
       "-pix_fmt",
       "yuv420p",
       options.outputPath,
@@ -366,7 +386,8 @@ export async function encodeVideo(options: {
   );
   pushAudioEncodeArgs(args, audioEncode);
   args.push(
-    "-shortest",
+    "-t",
+    outputDurationSec,
     "-pix_fmt",
     "yuv420p",
     options.outputPath,