Add rotation check to video transcoding logic

Seems like vertical videos aren't preserving rotation logic on copy.

src/video/actors.rs

@@ -138,6 +138,36 @@ async fn is_h264_encoded(video_path: &str) -> bool {
     }
 }
 
+/// Check if a video has rotation metadata
+/// Returns the rotation angle in degrees (0, 90, 180, 270) or 0 if none detected
+async fn get_video_rotation(video_path: &str) -> i32 {
+    let output = tokio::process::Command::new("ffprobe")
+        .arg("-v")
+        .arg("error")
+        .arg("-select_streams")
+        .arg("v:0")
+        .arg("-show_entries")
+        .arg("stream_tags=rotate")
+        .arg("-of")
+        .arg("default=noprint_wrappers=1:nokey=1")
+        .arg(video_path)
+        .output()
+        .await;
+
+    match output {
+        Ok(output) if output.status.success() => {
+            let rotation_str = String::from_utf8_lossy(&output.stdout);
+            let rotation_str = rotation_str.trim();
+            if rotation_str.is_empty() {
+                0
+            } else {
+                rotation_str.parse::<i32>().unwrap_or(0)
+            }
+        }
+        _ => 0,
+    }
+}
+
 pub struct VideoPlaylistManager {
     playlist_dir: PathBuf,
     playlist_generator: Addr<PlaylistGenerator>,
@@ -346,9 +376,19 @@ impl Handler<GeneratePlaylistMessage> for PlaylistGenerator {
 
             // Check if video is already h264 encoded
             let is_h264 = is_h264_encoded(&video_file).await;
-            let use_copy = is_h264;
 
-            if use_copy {
+            // Check for rotation metadata
+            let rotation = get_video_rotation(&video_file).await;
+            let has_rotation = rotation != 0;
+
+            let use_copy = is_h264 && !has_rotation;
+
+            if has_rotation {
+                info!("Video {} has rotation metadata ({}°), transcoding to apply rotation", video_file, rotation);
+                span.add_event("Transcoding due to rotation", vec![
+                    KeyValue::new("rotation_degrees", rotation as i64)
+                ]);
+            } else if use_copy {
                 info!("Video {} is already h264, using stream copy", video_file);
                 span.add_event("Using stream copy (h264 detected)", vec![]);
             } else {
@@ -362,10 +402,11 @@ impl Handler<GeneratePlaylistMessage> for PlaylistGenerator {
 
                 if use_copy {
                     // Video is already h264, just copy the stream
+                    // Note: rotation metadata will be preserved in the stream
                     cmd.arg("-c:v").arg("copy");
                     cmd.arg("-c:a").arg("aac"); // Still need to ensure audio is compatible
                 } else {
-                    // Need to transcode
+                    // Need to transcode - autorotate is enabled by default and will apply rotation
                     cmd.arg("-c:v").arg("h264");
                     cmd.arg("-crf").arg("21");
                     cmd.arg("-preset").arg("veryfast");