From a95dcec0a32c5e247d588155c6bab0a7a2d10129 Mon Sep 17 00:00:00 2001
From: chk <79915315+ChKendel@users.noreply.github.com>
Date: Sat, 6 Jun 2026 12:15:21 +0200
Subject: [PATCH] CoPilot Github: Stream fex 4

---
 tools/hires-probe.js | 108 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 tools/hires-probe.js

diff --git a/tools/hires-probe.js b/tools/hires-probe.js
new file mode 100644
index 0000000..5beaba3
--- /dev/null
+++ b/tools/hires-probe.js
@@ -0,0 +1,108 @@
+'use strict';
+
+// ── Hires-Grab-Diagnose — läuft DIREKT auf dem Host, ohne Docker/Express ──────
+//
+// Zweck: herausfinden, welche Auflösung /dev/videoN beim Grab WIRKLICH liefert,
+// entkoppelt vom Container (kein Sync-Lag, kein Redeploy). Loggt JEDEN Frame mit
+// Breite×Höhe und Bytes, speichert den besten als /tmp/hires-probe.jpg.
+//
+// Aufruf (auf dem ThinkCentre, im Projektverzeichnis):
+//   node tools/hires-probe.js /dev/video4 1920x1080 mjpeg
+//   node tools/hires-probe.js /dev/video4 1920x1080 copybsf
+//   node tools/hires-probe.js /dev/video0 1280x960  copybsf
+//
+// Args:  <device>  <size WxH>  <encode: mjpeg|copybsf>  [framerate=15]  [frames=12]
+
+const { spawn } = require('child_process');
+const fs = require('fs');
+
+const device = process.argv[2] || '/dev/video4';
+const size = process.argv[3] || '1920x1080';
+const encode = process.argv[4] || 'mjpeg';
+const fps = process.argv[5] || '15';
+const maxFrames = parseInt(process.argv[6] || '12', 10);
+
+// SOF-Marker lesen: Höhe bei +5, Breite bei +7
+function readJpegDims(buf) {
+  let i = 2;
+  while (i < buf.length - 8) {
+    if (buf[i] !== 0xFF) break;
+    const marker = buf[i + 1];
+    const segLen = buf.readUInt16BE(i + 2);
+    if (marker === 0xC0 || marker === 0xC2) {
+      return { h: buf.readUInt16BE(i + 5), w: buf.readUInt16BE(i + 7) };
+    }
+    i += 2 + segLen;
+  }
+  return { h: null, w: null };
+}
+
+// mpjpeg-Parser (identisch zur App: keyt auf Content-Length)
+class MpjpegParser {
+  constructor(onFrame) { this.onFrame = onFrame; this.buf = Buffer.alloc(0); this.need = -1; }
+  push(chunk) {
+    this.buf = this.buf.length ? Buffer.concat([this.buf, chunk]) : chunk;
+    for (;;) {
+      if (this.need < 0) {
+        const he = this.buf.indexOf('\r\n\r\n');
+        if (he < 0) return;
+        const m = /content-length:\s*(\d+)/i.exec(this.buf.toString('latin1', 0, he));
+        if (!m) { this.buf = this.buf.subarray(he + 4); continue; }
+        this.need = parseInt(m[1], 10);
+        this.buf = this.buf.subarray(he + 4);
+      }
+      if (this.buf.length < this.need) return;
+      const f = this.buf.subarray(0, this.need);
+      this.buf = this.buf.subarray(this.need);
+      this.need = -1;
+      try { this.onFrame(f); } catch (_e) {}
+    }
+  }
+}
+
+// EXAKT die Args, die die App im hires-Pfad nutzt (videoOutArgs):
+const outArgs = encode === 'mjpeg'
+  ? ['-c:v', 'mjpeg', '-q:v', '5']
+  : ['-c:v', 'copy', '-bsf:v', 'mjpeg2jpeg'];
+
+const args = [
+  '-hide_banner', '-loglevel', 'warning',
+  '-f', 'v4l2', '-input_format', 'mjpeg',
+  '-video_size', size, '-framerate', fps,
+  '-i', device,
+  ...outArgs, '-f', 'mpjpeg', 'pipe:1',
+];
+
+console.log(`\n[probe] device=${device} size=${size} encode=${encode} fps=${fps}`);
+console.log(`[probe] ffmpeg ${args.join(' ')}\n`);
+
+const p = spawn('ffmpeg', args, { stdio: ['ignore', 'pipe', 'pipe'] });
+
+let n = 0;
+let best = null;
+const parser = new MpjpegParser((frame) => {
+  n++;
+  const { w, h } = readJpegDims(frame);
+  console.log(`[probe] frame ${String(n).padStart(2)}  ${String(w)}x${String(h)}  ${frame.length} bytes`);
+  if (!best || frame.length > best.length) best = Buffer.from(frame);
+  if (n >= maxFrames) finish();
+});
+
+p.stdout.on('data', (c) => parser.push(c));
+p.stderr.on('data', (c) => process.stderr.write(`[ffmpeg] ${c}`));
+p.on('error', (e) => { console.error('[probe] spawn-Fehler:', e.message); process.exit(1); });
+
+let finished = false;
+function finish() {
+  if (finished) return; finished = true;
+  try { p.kill('SIGKILL'); } catch (_e) {}
+  if (best) {
+    const { w, h } = readJpegDims(best);
+    fs.writeFileSync('/tmp/hires-probe.jpg', best);
+    console.log(`\n[probe] ERGEBNIS: bester Frame ${w}x${h}, ${best.length} bytes → /tmp/hires-probe.jpg`);
+  } else {
+    console.log('\n[probe] ERGEBNIS: KEIN Frame empfangen');
+  }
+  process.exit(0);
+}
+setTimeout(finish, 8000); // Sicherheitsnetz