Update rust_highlight/src/lib.rs

rust_highlight/src/lib.rs

@@ -30,42 +30,26 @@ fn render_video(
     let n_words = words.len() as f64;
     let highlight_duration = duration / n_words;
 
-    // Build complex filter graph
-    let mut filter_complex = String::new();
-    let mut last_output = "0:v".to_string();
-
+    // Build filter graph
+    let mut filters = vec![];
     for (i, (_, (x, y, w, h))) in words.iter().enumerate() {
         let start = i as f64 * highlight_duration;
         let end = start + highlight_duration;
-
-        filter_complex.push_str(&format!(
-            "[{last_out}]drawbox=x={x}:y={y}:w={w}:h={h}:color=yellow@0.5:t=fill:enable='between(t,{start:.3},{end:.3})'[v{i}];",
-            last_out = last_output,
-            x = x,
-            y = y,
-            w = w,
-            h = h,
-            start = start,
-            end = end,
-            i = i
+        filters.push(format!(
+            "drawbox=x={x}:y={y}:w={w}:h={h}:color=yellow@0.5:t=fill:enable='between(t,{start:.2},{end:.2})'"
         ));
-        last_output = format!("[v{i}]");
     }
 
-    // Remove trailing semicolon
-    filter_complex.pop();
+    let filter_chain = filters.join(",");
 
     // FFmpeg command
     let status = Command::new("ffmpeg")
         .args(&[
             "-y",
-            "-hwaccel", "auto",
             "-loop", "1",
             "-i", &image_path,
             "-i", &audio_path,
-            "-filter_complex", &filter_complex,
-            "-map", &last_output,
-            "-map", "1:a",
+            "-vf", &filter_chain,
             "-c:v", "libx264",
             "-preset", "fast",
             "-crf", "18",
@@ -74,15 +58,17 @@ fn render_video(
             "-c:a", "aac",
             "-b:a", "192k",
             "-r", "60",
+            "-fps_mode", "vfr",  // Replaces deprecated -vsync
             "-t", &duration_str,
-            "-vsync", "2",
             &output_path,
         ])
         .status();
 
     match status {
         Ok(exit_status) if exit_status.success() => Ok(output_path),
-        Ok(_) => Err(pyo3::exceptions::PyRuntimeError::new_err("FFmpeg command failed")),
+        Ok(_) => Err(pyo3::exceptions::PyRuntimeError::new_err(
+            "FFmpeg command failed. Check filter syntax.",
+        )),
         Err(e) => Err(pyo3::exceptions::PyRuntimeError::new_err(format!(
             "Failed to execute FFmpeg: {}",
             e