BurntToasters · BurntToasters · Jun 14, 2026 · Jun 1, 2026 · Jun 1, 2026 · Jun 1, 2026
diff --git a/.gitignore b/.gitignore
@@ -41,6 +41,8 @@ build/Release
 *.tgz
 src/renderer/modules/*.js
 src/renderer/modules/*.js.map
+src/renderer/rosiEngine.js
+src/renderer/rosiEngine.js.map
 
 # macOS provisioning
 *.provisionprofile

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,24 +1,19 @@
-<!-- hidden <p align="center">
-
-<img width="45%" height="1012" alt="ROSI-3-1-1" src="https://github.com/user-attachments/assets/c42baa99-5ffa-4700-86c1-cc9aad3b9c7c" />
-  &nbsp;
-  <img width="45%" height="1012" alt="ROSI-3-x-app" src="https://github.com/user-attachments/assets/2105b523-7392-4c4c-8241-425b0096ca24" />
-
-</p> -->
-
- <!-- >[!NOTE]
-> 🅱️ This is a beta build.
--->
+<!--
+> [!NOTE]
+> 🅱️ This is a Beta build. -->
 
 # ⬇️ Downloads
 
-[<img src="https://get.microsoft.com/images/en-us%20dark.svg" width="175"/>](https://apps.microsoft.com/detail/9p4q134b2jw3?referrer=appbadge&mode=direct)
+| <img height="20" src="https://github.com/user-attachments/assets/340d360e-79b1-4c70-bfab-d944085f75df" /> Windows                                                                                    | <img height="20" src="https://github.com/user-attachments/assets/42d7e887-4616-4e8c-b1d3-e44e01340f8c" /> macOS | <img height="20" src="https://github.com/user-attachments/assets/e0cc4f33-4516-408b-9c5c-be71a3ac316b" /> Linux                                                                                                    |
+| :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| **EXE:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Windows-x64.exe) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Windows-arm64.exe) | **[Universal DMG](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-MacOS-universal.dmg)**    | **AppImage:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Linux-x86_64.AppImage) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Linux-arm64.AppImage) |
+| <div align="center"><a href="https://apps.microsoft.com/detail/9p4q134b2jw3?referrer=appbadge&mode=direct"><img src="https://get.microsoft.com/images/en-us%20dark.svg" width="150"/></a></div>      | **[Universal ZIP](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-MacOS-universal.zip)**    | **DEB:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Linux-amd64.deb) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Linux-arm64.deb)                 |
+|                                                                                                                                                                                                      |                                                                                                                 | **RPM:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Linux-x86_64.rpm) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.1.0/ROSI-Linux-aarch64.rpm)              |
 
-| <img height="20" src="https://github.com/user-attachments/assets/340d360e-79b1-4c70-bfab-d944085f75df" /> Windows                                                                                        | <img height="20" src="https://github.com/user-attachments/assets/42d7e887-4616-4e8c-b1d3-e44e01340f8c" /> MacOS | <img height="20" src="https://github.com/user-attachments/assets/e0cc4f33-4516-408b-9c5c-be71a3ac316b" /> Linux                                                                                                      |
-| :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| **[Universal EXE](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-Windows.exe)** <br>_(Both x64 and arm64)_                                                                         | **[Universal DMG](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-MacOS-universal.dmg)**   | **AppImage:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-Linux-x86_64.AppImage) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-Linux-arm64.AppImage) |
-| **Other:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-Windows-x64.exe) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-Windows-arm64.exe) |                                                                                                                 | **DEB:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-linux_amd64.deb) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-linux_arm64.deb)                 |
-|                                                                                                                                                                                                          |                                                                                                                 | **RPM:** [x64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-linux.x86_64.rpm) / [arm64](https://github.com/BurntToasters/ROSI/releases/download/v4.0.13/ROSI-linux.aarch64.rpm)              |
+> [!IMPORTANT]
+> The `.sig` files in this repo are NOT normal GPG signatures — they are for ROSI's built-in updater to verify the integrity of updates before downloading and installing.
+>
+> The `.asc` files are my normal GPG signatures which you can verify using my GPG Public Key: https://tuxedo.rosie.run/GPG/BurntToasters_0xF2FBC20F_public.asc
 
 <!-- REMOVED <details>
   <summary>🛠️ Build Status & OS App Store Publishing Status (for NERDS)</summary>
@@ -27,30 +22,34 @@
 | :--- | :--- | :--- |
 | **Windows (ARM/x64)** | ✅ Signed (GPG) | GPG Signed. |
 | **Microsoft Store** | ❌ | `v4.0.0` is still in beta. |
-| **MacOS (ARM/x64)** | ✅ Signed (GPG & Apple Developer Cert) | Fully codesigned by Apple Developer cert. |
+| **macOS (ARM/x64)** | ✅ Signed (GPG & Apple Developer Cert) | Fully codesigned by Apple Developer cert. |
 | **Linux (ARM/x64)**| ✅ Signed (GPG) | GPG Signed. |
 </details> -->
 
 ### ℹ️ Enjoying ROSI? Consider [❤️ Supporting Me! ❤️](https://rosie.run/support)
 
 ---
 
-## Changes in `v4.0.13:`
-
-- **Electron:** Updated electron to `42.2.0`
-- **PKG:** Updated packages.
-
-## Changes in `v4.0.12:`
-
-- **Electron:** Updated electron to `42.0.0`.
-- **PKG:** Updated packages.
-
-## Changes in `v4.0.9:`
-
-- **Electron:** Updated electron to `41.5.0`.
-- **PKG:** Updated packages.
-
-## Changes in `v4.0.0`:
+## Changes in `v4.1.0:`
+
+- **NEW - Preview:** Added video preview before downloading so ROSI can show the title, uploader, duration, thumbnail, playlist info, and other basic metadata before saving.
+- **NEW - Enhancements:** Added download options for embedded metadata, embedded thumbnails / cover art, subtitles with custom language codes, and SponsorBlock segment removal.
+- **Updater:** Fixed macOS in-app updates where **Restart Now** did nothing after an update finished downloading.
+- **Updater:** Fixed the `Auto` update channel so beta installs actually receive beta updates when that setting is selected.
+- **Downloads:** Manual downloads and the queue no longer stomp each other. ROSI now blocks conflicting starts instead of silently killing one mid-run.
+- **Downloads:** Queue downloads now use your chosen download folder instead of always saving to system Downloads.
+- **Conversion:** Updated FFmpeg conversion to probe source codecs first, then copy compatible video/audio streams instead of re-encoding when possible.
+- **GPU detection:** Updated hardware acceleration detection to probe actual FFmpeg encoders, cache the result, and only claim a GPU path when that encoder can run.
+- **Settings:** Importing settings refreshes the UI in-place instead of forcing a full app restart.
+- **macOS:** Closing the window now stops active downloads instead of leaving `yt-dlp` running headless in the background.
+- **Security:** Tightened download URL validation, output path checks, `ffmpeg` path handling on import, and subprocess environment hardening.
+- **Typescript:** Migrated the main renderer engine from JavaScript to TypeScript and widened renderer type coverage.
+- **UI:** Split the renderer CSS into focused files, bundled local Manrope / IBM Plex Mono fonts, tightened CSP by removing remote Google Fonts, and shipped a broader accessibility and polish pass across the setup wizard, modals, queue, launch theming, and update progress UI.
+- **FFMPEG:** Updated FFmpeg compliance docs, notices, source offer, and binary placeholders for FFmpeg `8.1` builds on Windows, Linux, and macOS arm64. macOS x64 stays on FFmpeg `8.0.1`.
+- **Testing:** Expanded automated coverage across the updater, downloader, preview pipeline, IPC validation, renderer modules, video info parsing, codec-aware FFmpeg args, GPU probing, settings migration, and queue wiring.
+- **PKG:** Updated packages and bundled binaries.
+
+## Changes in `v4.0.0:`
 
 ### Welcome to ROSI v4!
 
@@ -63,7 +62,7 @@ Version 4 is the biggest change to ROSI of all time! I have been working hard on
 - **GPU detection:** Improved the `auto` mode for GPU detection if a user chooses to convert a download.
 - **NEW - UI:** The UI has been revamped again with a much more space efficient design with better UX/UI.
   - **Themes:** Say hello to theming in ROSI! Currently Dark, Light, and Purple (the old theme) are available!
-- **MISC:** Much much more improvements to the code! Linux support has been improved and other aspects of the code now runs better!
+- **Misc:** Much much more improvements to the code! Linux support has been improved and other aspects of the code now runs better!
 
 ### FULL CHANGELOG:
 
@@ -76,15 +75,18 @@ Nothing.. yet!
 
 </details>
 
-# ℹ️ Installation & Notes
+> [!IMPORTANT]
+> **Note:** MSI builds are not currently provided. Use the EXE installer.
+
+## ℹ️ Release Info
 
 ### 🔐 GPG Signing
 
 ROSI Binaries (`v2.1.2+`) are GPG signed. You can verify the authenticity of your download by downloading the installer, its accompanying sig, and the public key which is available at: [https://tuxedo.rosie.run/GPG/BurntToasters_0xF2FBC20F_public.asc](https://tuxedo.rosie.run/GPG/BurntToasters_0xF2FBC20F_public.asc)
 
 > **Windows Users:** If you want a fully codesigned experience for Windows, check out the [Microsoft Store](https://apps.microsoft.com/detail/9p4q134b2jw3?referrer=appbadge&mode=direct) version (Stable releases only).
 
-_ROSI's MacOS release is the only GitHub release that is fully codesigned by a developer cert from apple. If you are looking for a version of ROSI that is codesigned for windows, check out the [Microsoft Store](https://apps.microsoft.com/detail/9p4q134b2jw3?referrer=appbadge&mode=direct) version!_
+_ROSI's macOS release is the only GitHub release that is fully codesigned by a developer cert from apple. If you are looking for a version of ROSI that is codesigned for windows, check out the [Microsoft Store](https://apps.microsoft.com/detail/9p4q134b2jw3?referrer=appbadge&mode=direct) version!_
 
 # LTS Version
 

diff --git a/README.md b/README.md
@@ -45,7 +45,7 @@ Download ROSI source code from source (main)
 
 There is an LTS version of the previous stable full release of ROSI (which is now `v3.x.x`) which can be found at <b>[➡️ROSI-LTS's Repo](https://github.com/BurntToasters/ROSI-LTS)</b>
 
-This is mainly for people who perfered the previous look of ROSI, or has a current issue with a newly released major version.
+This is mainly for people who prefer the previous look of ROSI, or has an issue with a newly released major version.
 
 The LTS version only provides yt-dlp updates and minor bug fixes. No feature additions will happen with LTS versions. Whatever features were added to that version before it became LTS are the last features it will receive.
 

diff --git a/THIRD‑PARTY‑NOTICES.md b/THIRD‑PARTY‑NOTICES.md
@@ -26,10 +26,11 @@
    License: GPL‑2.0‑or‑later <br>
    Link: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html <br>
    Source: https://github.com/BurntToasters/ffmpeg-static-builds <br>
-   ROSI bundles static GPL builds of FFmpeg 8.0 for all platforms. FFmpeg is invoked as an
-   external process and is not linked into ROSI. The complete corresponding source code,
-   build scripts, and configuration are available at the source URL above. A written source
-   offer is included with the distributed binaries at `ffmpeg/SOURCE_OFFER.txt`. <br>
+   ROSI bundles static GPL builds of FFmpeg 8.1 for Windows, Linux, and macOS arm64;
+   macOS x64 remains on FFmpeg 8.0.1. FFmpeg is invoked as an external process and is
+   not linked into ROSI. The complete corresponding source code, build scripts, and
+   configuration are available at the source URL above. A written source offer is
+   included with the distributed binaries at `ffmpeg/SOURCE_OFFER.txt`. <br>
 
 # Python intepreter full license
 
@@ -557,7 +558,7 @@ Jean-Philippe Aumasson (https://131002.net/siphash/siphash24.c)
 
 The file Python/dtoa.c, which supplies C functions dtoa and strtod for conversion of C doubles to and from strings, is derived from the file of the same name by David M. Gay, currently available from https://web.archive.org/web/20220517033456/http://www.netlib.org/fp/dtoa.c. The original file, as retrieved on March 16, 2009, contains the following copyright and licensing notice:
 
-/******************************\*\*\*\*******************************
+/**************\*\***************\*\*\*\***************\*\***************
 
 -
 - The author of this software is David M. Gay.
@@ -574,7 +575,7 @@ The file Python/dtoa.c, which supplies C functions dtoa and strtod for conversio
 - WARRANTY. IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY
 - REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
 - OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
-- ******************************\*\*\*******************************/
+- **************\*\***************\*\*\***************\*\***************/
 
 ---
 

diff --git a/assets/yt-dlp.exe b/assets/yt-dlp.exe
diff --git a/assets/yt-dlp_arm64.exe b/assets/yt-dlp_arm64.exe
diff --git a/assets/yt-dlp_linux b/assets/yt-dlp_linux
diff --git a/assets/yt-dlp_linux_aarch64 b/assets/yt-dlp_linux_aarch64
diff --git a/assets/yt-dlp_macos b/assets/yt-dlp_macos
diff --git a/build-scripts/check-coverage-thresholds.js b/build-scripts/check-coverage-thresholds.js
@@ -13,6 +13,9 @@ const summary = JSON.parse(fs.readFileSync(summaryPath, 'utf8'));
 const thresholds = {
   'src/main/main.ts': { lines: 12, statements: 12 },
   'src/main/preload.ts': { lines: 80, statements: 80 },
+  'src/main/processKill.ts': { lines: 80, statements: 80 },
+  'src/utils/validation.ts': { lines: 85, statements: 85 },
+  'src/utils/downloadLifecycle.ts': { lines: 90, statements: 90 },
 };
 
 function findCoverageEntry(suffix) {
@@ -46,4 +49,4 @@ if (failures.length > 0) {
   process.exit(1);
 }
 
-console.log('Coverage thresholds passed for main.ts and preload.ts.');
+console.log('Coverage thresholds passed.');