add play button to video thumbnails

.gitattributes

@@ -0,0 +1 @@
+src/assets/play.png filter=lfs diff=lfs merge=lfs -text

Makefile

@@ -5,6 +5,7 @@ package: target/release/upend webui/public/build/main.js
 	linuxdeploy-x86_64.AppImage --appdir dist
 	cp target/release/upend dist/usr/bin/upend
 	cp -r webui/public dist/usr/bin/webui
+	cp -r src/assets dist/usr/bin/assets
 	cp media/upend.png dist/usr/share/icons/upend.png
 	VERSION="$$(grep '^version' Cargo.toml|grep -Eo '[0-9]+\.[0-9]+\.[0-9]+')" \
 		linuxdeploy-x86_64.AppImage --appdir dist -d upend.desktop --output appimage

src/previews/video.rs

@@ -1,10 +1,13 @@
 use anyhow::anyhow;
+use log::warn;
 use std::io::Read;
 use std::path::Path;
 use std::process::Command;
 
 use anyhow::Result;
 
+use crate::common::get_static_dir;
+
 use super::Previewable;
 
 pub struct VideoPath<'a>(pub &'a Path);
@@ -26,9 +29,21 @@ impl<'a> Previewable for VideoPath<'a> {
         let duration = String::from_utf8_lossy(&duration_cmd.stdout)
             .trim()
             .parse::<f64>()?;
+        let play_button = get_static_dir("assets").map(|d| d.join("play.png")).ok();
         let outfile = tempfile::Builder::new().suffix(".webp").tempfile()?;
         let thumbnail_cmd = Command::new("ffmpeg")
             .args(["-i", &self.0.to_string_lossy()])
+            .args(if let Some(play_button) = play_button {
+                vec![
+                    "-i".to_string(),
+                    play_button.to_string_lossy().to_string(),
+                    "-filter_complex".to_string(),
+                    "[0:v][1:v]overlay=(W-w)/2:(H-h)/2".to_string(),
+                ]
+            } else {
+                warn!("Could not find play button to overlay for video thumbnail!");
+                vec![]
+            })
             .args(["-vframes", "1"])
             .args(["-ss", &(duration / 2.0).to_string()])
             .arg(&*outfile.path().to_string_lossy())