V2 Feature overhaul and improvements

lib/comparison/stitcher.js

@@ -0,0 +1,45 @@
+const ffmpeg = require('fluent-ffmpeg');
+const fs = require('fs');
+
+/**
+ * Stitches two videos side-by-side.
+ * @param {string} video1 Path to first video
+ * @param {string} video2 Path to second video
+ * @param {string} outputPath Path to save output
+ * @returns {Promise<string>}
+ */
+function stitchVideos(video1, video2, outputPath) {
+    return new Promise((resolve, reject) => {
+        if (!fs.existsSync(video1) || !fs.existsSync(video2)) {
+            return reject(new Error('One or both input videos not found'));
+        }
+
+        ffmpeg()
+            .input(video1)
+            .input(video2)
+            .complexFilter([
+                {
+                    filter: 'hstack',
+                    options: { inputs: 2 },
+                    outputs: 'v'
+                }
+            ])
+            .map('v') // Map the video stream from filter
+             // We assume no audio for speed tests usually, or we ignore it
+            .outputOptions([
+                '-c:v libx264',
+                '-crf 23',
+                '-preset fast'
+            ])
+            .save(outputPath)
+            .on('end', () => {
+                resolve(outputPath);
+            })
+            .on('error', (err) => {
+                console.error('FFmpeg error:', err);
+                reject(err);
+            });
+    });
+}
+
+module.exports = { stitchVideos };