fix: reduce font size to 16, improve TTS sync (3 words/chunk, 0.3s/word)

ffmpeg-service/main.py

@@ -117,7 +117,7 @@ def generate_simple_vtt(text: str, vtt_path: Path):
 
     for word in words:
         current_chunk.append(word)
-        if len(current_chunk) >= 5 or word.endswith((".", "!", "?", ":")):
+        if len(current_chunk) >= 3 or word.endswith((".", "!", "?", ":")):
             chunks.append(" ".join(current_chunk))
             current_chunk = []
 
@@ -131,7 +131,7 @@ def generate_simple_vtt(text: str, vtt_path: Path):
 
     for i, chunk in enumerate(chunks):
         word_count = len(chunk.split())
-        duration = word_count * 0.4  # 0.4 seconds per word
+        duration = word_count * 0.3  # 0.3 seconds per word (faster sync)
 
         start_time = format_vtt_time(current_time)
         end_time = format_vtt_time(current_time + duration)

server/routes/reels.ts

@@ -185,7 +185,7 @@ reelsRouter.post('/reels/preview', async (req: Request, res: Response) => {
             ttsEnabled,
             ttsVoice,
             wordDuration = 0.6,
-            fontSize = 24,
+            fontSize = 16,
             musicVolume = 0.25,
             drawText = true,
         } = req.body;
@@ -255,7 +255,7 @@ reelsRouter.post('/reels', async (req: Request, res: Response) => {
             pageIds,
             scheduledFor,
             wordDuration = 0.6,
-            fontSize = 24,
+            fontSize = 16,
             musicVolume = 0.25,
             drawText = true,
         } = req.body;

server/services/ffmpeg.ts

@@ -83,7 +83,7 @@ export class FFmpegService {
             tts_enabled: options.ttsEnabled,
             tts_voice: options.ttsVoice,
             word_duration: options.wordDuration ?? 0.6,
-            font_size: options.fontSize ?? 24,
+            font_size: options.fontSize ?? 16,
             music_volume: options.musicVolume ?? 0.25,
             draw_text: options.drawText ?? true,
         };
@@ -176,7 +176,7 @@ export class FFmpegService {
             tts_enabled: options.ttsEnabled,
             tts_voice: options.ttsVoice,
             word_duration: options.wordDuration ?? 0.6,
-            font_size: options.fontSize ?? 24,
+            font_size: options.fontSize ?? 16,
             music_volume: options.musicVolume ?? 0.25,
             draw_text: options.drawText ?? true,
         };