feat: extract video thumbnails and display them during video loading to eliminate flicker

Author: Lolle2000la

crates/media-sort-gui/src/subscriptions/prefetch.rs

@@ -4,6 +4,45 @@ use crate::message::Message;
 
 #[allow(dead_code)]
 pub fn generate_thumbnail(path: &PathBuf) -> Vec<u8> {
+    let is_video = if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
+        let ext_lower = ext.to_lowercase();
+        ext_lower == "mp4" || ext_lower == "mkv" || ext_lower == "avi" || ext_lower == "mov" || ext_lower == "webm" || ext_lower == "wmv" || ext_lower == "flv"
+    } else {
+        false
+    };
+
+    if is_video {
+        if let Ok(mut player) = media_sort_backend::media::mpv_context::MpvContext::new() {
+            if player.load_file(path).is_ok() {
+                player.set_paused(true);
+                let start_time = std::time::Instant::now();
+                let mut loaded = false;
+                while start_time.elapsed() < std::time::Duration::from_millis(500) {
+                    let (w, h) = player.get_video_size();
+                    if w > 0 && h > 0 {
+                        loaded = true;
+                        break;
+                    }
+                    std::thread::sleep(std::time::Duration::from_millis(10));
+                }
+
+                if loaded {
+                    let render_w = 128;
+                    let render_h = 128;
+                    let mut buffer = vec![0u8; render_w * render_h * 4];
+                    if player.render_frame(render_w as i32, render_h as i32, &mut buffer).is_ok() {
+                        if let Some(rgba) = image::RgbaImage::from_raw(render_w as u32, render_h as u32, buffer) {
+                            let mut buf = std::io::Cursor::new(Vec::new());
+                            if rgba.write_to(&mut buf, image::ImageFormat::Png).is_ok() {
+                                return buf.into_inner();
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
     if let Ok(img) = image::open(path) {
         let thumbnail = img.thumbnail(128, 128);
         let mut buf = std::io::Cursor::new(Vec::new());

crates/media-sort-gui/src/view/media_preview.rs

@@ -53,6 +53,11 @@ pub fn media_preview_view(state: &AppState) -> Element<'_, Message> {
                     .width(Length::Fill)
                     .height(Length::Fill)
                     .into()
+            } else if let Some(thumb_handle) = state.thumbnail_cache.peek(&entry.path) {
+                iced::widget::image(thumb_handle.clone())
+                    .width(Length::Fill)
+                    .height(Length::Fill)
+                    .into()
             } else {
                 crate::widgets::video_canvas::video_canvas_view(entry.path.clone(), &state.l10n)
             };