fixed video chapters when downloading an anime episode

desktop/src/api/local/download.service.ts

@@ -175,14 +175,53 @@ export async function downloadAnimeEpisode(params: AnimeDownloadParams) {
         subFiles.forEach(f => args.push('-i', f));
 
         let chaptersInputIndex = -1;
+
         if (chapters?.length) {
             const meta = path.join(tempDir, 'chapters.txt');
-            let txt = ';FFMETADATA1\n';
-            for (const c of chapters) {
-                txt += `[CHAPTER]\nTIMEBASE=1/1000\nSTART=${c.start_time * 1000 | 0}\nEND=${c.end_time * 1000 | 0}\ntitle=${c.title}\n`;
+
+            const sorted = [...chapters].sort((a, b) => a.start_time - b.start_time);
+            const lines: string[] = [';FFMETADATA1'];
+
+            for (let i = 0; i < sorted.length; i++) {
+                const c = sorted[i];
+
+                const start = Math.floor(c.start_time * 1000);
+                const end = Math.floor(c.end_time * 1000);
+                const title = (c.title || 'chapter').toUpperCase();
+
+                lines.push(
+                    '[CHAPTER]',
+                    'TIMEBASE=1/1000',
+                    `START=${start}`,
+                    `END=${end}`,
+                    `title=${title}`
+                );
+
+                if (i < sorted.length - 1) {
+                    const nextStart = Math.floor(sorted[i + 1].start_time * 1000);
+                    if (nextStart - end > 1000) {
+                        lines.push(
+                            '[CHAPTER]',
+                            'TIMEBASE=1/1000',
+                            `START=${end}`,
+                            `END=${nextStart}`,
+                            'title=Episode'
+                        );
+                    }
+                } else {
+                    lines.push(
+                        '[CHAPTER]',
+                        'TIMEBASE=1/1000',
+                        `START=${end}`,
+                        'title=Episode'
+                    );
+                }
             }
-            fs.writeFileSync(meta, txt);
+
+            fs.writeFileSync(meta, lines.join('\n'));
             args.push('-i', meta);
+
+            // índice correcto del metadata input
             chaptersInputIndex = 1 + audioInputs.length + subFiles.length;
         }