Rewrite: Rust + Tauri + React for optimized cross-platform desktop app by Copilot · Pull Request #6 · animikhaich/Timelapse-Creator

Copilot · 2026-01-31T23:33:13Z

PR Review Fixes

Fixed FFmpeg stderr buffer deadlock issue by using -loglevel error -nostats and redirecting stderr to null
Added speed_multiplier validation (must be 2-1000) with clear error messages
Changed get_output_path to return Result and properly propagate directory creation errors
Added descriptive error messages in parse_ffprobe_output when video metadata is invalid
Enabled restrictive CSP in tauri.conf.json instead of null
Removed unused tauri_plugin_shell (reduces attack surface)
Removed duplicate CSS import in App.tsx
Fixed BUILD.md workflow filename reference (build.yml → build-release.yml)
Fixed README.md download links to point to releases page instead of fixed asset names

Original prompt

Rewrite this entire software from scratch for a highly optimized fast and efficient desktop application with the same functionality with beautiful native UI for across platform application across all kinds of Devices and OS. Feel free to choose the best language(s) and software stack for the job. Assume and start with a clean slate if you need to.

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

…rm desktop app Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

animikhaich · 2026-01-31T23:43:22Z

@copilot Add unit tests to make sure it runs well. Ensure the code works. And update github workflows to adhere to the new codebase and review and make sure everything looks good. Fix any issues you come across.

Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

Copilot · 2026-01-31T23:53:37Z

@copilot Add unit tests to make sure it runs well. Ensure the code works. And update github workflows to adhere to the new codebase and review and make sure everything looks good. Fix any issues you c...

Added comprehensive unit tests and fixed the GitHub workflow in commit 1d76730:

Rust Backend Tests (18 tests):

Video format validation
FPS parsing (fractions/decimals)
Output path generation
Data structure serialization

React Frontend Tests (20 tests):

Component rendering
User interactions
State management
Duration formatting
Batch processing

Workflow Fixes:

Fixed Rust action (dtolnay/rust-toolchain@stable)
Added test job that runs before build
Added dependency caching
Added PR trigger for tests

Copilot

Pull request overview

This PR is a full rewrite of “Timelapse Creator” from a Python/Tkinter + OpenCV desktop app into a Rust + Tauri (v2) backend with a React/TypeScript + Vite frontend, using FFmpeg/ffprobe for video inspection and timelapse conversion.

Changes:

Replaced the legacy Python GUI + OpenCV conversion pipeline with a Tauri/Rust backend that shells out to FFmpeg and emits progress events to the UI.
Added a new React UI for file selection, speed selection (2x–1000x), and progress/toast feedback.
Reworked packaging/build/release setup and updated docs (README/BUILD/CHANGELOG) for the new stack.

Reviewed changes

Copilot reviewed 27 out of 37 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
`video_utils.py`	Removed legacy OpenCV-based conversion helpers.
`version.py`	Removed legacy Python versioning module.
`requirements.txt`	Removed Python dependency list (numpy/opencv).
`main.py`	Removed legacy Tkinter GUI entrypoint.
`build-windows.bat`	Removed PyInstaller Windows build script.
`build-macos.sh`	Removed PyInstaller macOS build script.
`build-linux.sh`	Removed PyInstaller Linux build script.
`src-tauri/tauri.conf.json`	Added Tauri v2 app config (build, bundling, plugins, security settings).
`src-tauri/src/video.rs`	Added ffprobe-based video metadata extraction + output path generation.
`src-tauri/src/commands.rs`	Added Tauri commands for selecting videos, fetching metadata, and running FFmpeg conversions with progress events.
`src-tauri/src/main.rs`	Added Tauri app bootstrap and command registration.
`src-tauri/build.rs`	Added Tauri build script integration.
`src-tauri/Cargo.toml`	Added Rust crate definition and Tauri/plugin dependencies.
`src-tauri/icons/icon.icns`	Added macOS app icon asset.
`src-tauri/icons/32x32.png`	Added app icon asset.
`src-tauri/icons/128x128.png`	Added app icon asset.
`src-tauri/icons/128x128@2x.png`	Added app icon asset.
`frontend/package.json`	Added React + Tauri JS API dependencies and build scripts.
`frontend/index.html`	Added Vite/React HTML entrypoint.
`frontend/vite.config.ts`	Added Vite config tailored for Tauri dev/build.
`frontend/tsconfig.json`	Added TypeScript config for frontend sources.
`frontend/tsconfig.node.json`	Added TypeScript config for Vite tooling config.
`frontend/src/vite-env.d.ts`	Added Vite TS environment types.
`frontend/src/styles.css`	Added full UI styling/theme for the new app.
`frontend/src/main.tsx`	Added React bootstrapping/entrypoint.
`frontend/src/App.tsx`	Added main UI: selection, speed, conversion trigger, progress and toasts.
`frontend/public/favicon.png`	Added frontend favicon.
`README.md`	Updated documentation for new stack, installation, and usage.
`BUILD.md`	Updated build instructions for Rust/Tauri + frontend workflow.
`CHANGELOG.md`	Updated changelog to reflect the 1.0.0 rewrite.
`.gitignore`	Replaced Python-focused ignores with Rust/Node/Tauri ignores.
`.github/workflows/build-release.yml`	Replaced PyInstaller CI with a Tauri/Rust + Node build matrix.

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Copilot · 2026-01-31T23:54:22Z

+    let mut child = Command::new("ffmpeg")
+        .args(&args)
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()


FFmpeg is spawned with stderr piped, but stderr is never read. FFmpeg writes progress/stats to stderr by default, so this can deadlock on longer conversions when the stderr pipe buffer fills. Redirect stderr (e.g., inherit/null), lower log verbosity (-loglevel error -nostats), or spawn a thread/task to continuously drain stderr.

Copilot · 2026-01-31T23:54:22Z

+    let output_dir = parent.join("outputs");
+
+    // Create output directory if it doesn't exist
+    let _ = std::fs::create_dir_all(&output_dir);
+


create_dir_all errors are silently ignored. If the output directory can’t be created (permissions, read-only media, etc.), FFmpeg will fail later with a less actionable error. Consider returning a Result from get_output_path (or at least logging/propagating the IO error) so callers can fail fast with a clear message.

Copilot · 2026-01-31T23:54:22Z

+    "security": {
+      "csp": null
+    }


csp is set to null, which disables CSP entirely. This weakens defenses against XSS and script injection in the webview. Prefer a restrictive CSP (and only relax as needed), especially since the app exposes privileged APIs via Tauri.

Copilot · 2026-01-31T23:54:23Z

+fn main() {
+    tauri::Builder::default()
+        .plugin(tauri_plugin_dialog::init())
+        .plugin(tauri_plugin_shell::init())
+        .invoke_handler(tauri::generate_handler![


tauri_plugin_shell is initialized, but there are no Rust or frontend call sites using it (FFmpeg is executed via std::process::Command). If it’s not needed, remove the plugin (and its config scope) to reduce attack surface.

Copilot · 2026-01-31T23:54:23Z

+import { useState, useEffect, useCallback } from "react";
+import { invoke } from "@tauri-apps/api/core";
+import { listen } from "@tauri-apps/api/event";
+import "./styles.css";


styles.css is imported both here and in main.tsx, which is redundant and can cause duplicate CSS injection depending on the bundler setup. Keep the global stylesheet import in one place (typically main.tsx).

Suggested change

import "./styles.css";

Copilot · 2026-01-31T23:54:23Z

+The repository includes a GitHub Actions workflow that automatically builds for all platforms:

-# Run the build script
-./build-linux.sh
+```yaml
+# .github/workflows/build.yml will build on:
+# - windows-latest
+# - macos-latest
+# - ubuntu-22.04
 ```


This references .github/workflows/build.yml, but the repository workflow file is build-release.yml. Update the filename in this snippet so contributors can find the correct CI config.

Copilot · 2026-01-31T23:54:23Z

+pub async fn select_videos(window: Window) -> Result<SelectionResult, String> {
+    let formats_str = SUPPORTED_FORMATS.join(",");
+


formats_str is computed but never used, which will trigger an unused-variable warning. Remove it, or use it to build the dialog filter/title text.

Copilot · 2026-01-31T23:54:24Z

+    // Calculate PTS (presentation timestamp) divisor for speed
+    // To speed up by Nx, we use setpts=PTS/N
+    let pts_divisor = speed_multiplier as f64;
+


speed_multiplier isn’t validated on the backend. If 0 (or 1) is passed, the filter becomes invalid (division by zero / no-op) and you’ll emit a generic FFmpeg failure. Consider rejecting values < 2 (and optionally > 1000 to match the UI) with a clear error message before spawning FFmpeg.

Copilot · 2026-01-31T23:54:24Z

+    VideoInfo {
+        path: path.to_string(),
+        filename: filename.to_string(),
+        duration_secs,
+        width,
+        height,
+        fps,
+        total_frames,
+        valid: width > 0 && height > 0 && duration_secs > 0.0,
+        error: None,
+    }


parse_ffprobe_output always sets error: None, even when valid ends up false. Since callers rely on error for user-facing failures, this produces unhelpful generic messages (e.g., "Invalid video"). Populate error when required fields are missing/zero so the UI can surface a meaningful reason.

Copilot · 2026-01-31T23:54:24Z

+| Windows | [Download .exe](https://github.com/animikhaich/Timelapse-Creator/releases/latest/download/timelapse-creator_windows.exe) | Windows 10+ |
+| macOS | [Download .dmg](https://github.com/animikhaich/Timelapse-Creator/releases/latest/download/timelapse-creator_macos.dmg) | macOS 10.15+ |
+| Linux | [Download .AppImage](https://github.com/animikhaich/Timelapse-Creator/releases/latest/download/timelapse-creator_linux.AppImage) | Modern Linux distros |


These direct release asset links are likely to break because Tauri-generated bundle filenames typically include version/arch and the workflow doesn’t rename assets to the fixed names used here. Consider linking to the Releases page instead, or update the CI to rename uploaded artifacts to match the documented filenames.

Suggested change

| Windows | [Download .exe](https://github.com/animikhaich/Timelapse-Creator/releases/latest/download/timelapse-creator_windows.exe) | Windows 10+ |

| macOS | [Download .dmg](https://github.com/animikhaich/Timelapse-Creator/releases/latest/download/timelapse-creator_macos.dmg) | macOS 10.15+ |

| Linux | [Download .AppImage](https://github.com/animikhaich/Timelapse-Creator/releases/latest/download/timelapse-creator_linux.AppImage) | Modern Linux distros |

| Windows | [Download from latest release](https://github.com/animikhaich/Timelapse-Creator/releases/latest) | Windows 10+ |

| macOS | [Download from latest release](https://github.com/animikhaich/Timelapse-Creator/releases/latest) | macOS 10.15+ |

| Linux | [Download from latest release](https://github.com/animikhaich/Timelapse-Creator/releases/latest) | Modern Linux distros |

animikhaich · 2026-01-31T23:55:26Z

@copilot apply changes based on the comments in this thread

animikhaich · 2026-01-31T23:57:27Z

@copilot the CI Tests failed. Fix it. Error below:

   Compiling encoding_rs v0.8.35
     Running `/home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc --crate-name encoding_rs --edition=2018 /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/encoding_rs-0.8.35/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="alloc"' --cfg 'feature="default"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("alloc", "any_all_workaround", "default", "fast-big5-hanzi-encode", "fast-gb-hanzi-encode", "fast-hangul-encode", "fast-hanja-encode", "fast-kanji-encode", "fast-legacy-encode", "less-slow-big5-hanzi-encode", "less-slow-gb-hanzi-encode", "less-slow-kanji-encode", "serde", "simd-accel"))' -C metadata=1fe11ca815902c07 -C extra-filename=-27ffcc8e8427f08a --out-dir /home/runner/work/Timelapse-Creator/Timelapse-Creator/src-tauri/target/debug/deps -L dependency=/home/runner/work/Timelapse-Creator/Timelapse-Creator/src-tauri/target/debug/deps --extern cfg_if=/home/runner/work/Timelapse-Creator/Timelapse-Creator/src-tauri/target/debug/deps/libcfg_if-a3662b74b62b86e1.rmeta --cap-lints allow`
     Running `/home/runner/work/Timelapse-Creator/Timelapse-Creator/src-tauri/target/debug/build/timelapse-creator-122377edef4a6a28/build-script-build`
error: failed to run custom build command for `timelapse-creator v1.0.0 (/home/runner/work/Timelapse-Creator/Timelapse-Creator/src-tauri)`

Caused by:
  process didn't exit successfully: `/home/runner/work/Timelapse-Creator/Timelapse-Creator/src-tauri/target/debug/build/timelapse-creator-122377edef4a6a28/build-script-build` (exit status: 1)
  --- stdout
  cargo:rerun-if-env-changed=TAURI_CONFIG
  cargo:rustc-check-cfg=cfg(desktop)
  cargo:rustc-cfg=desktop
  cargo:rustc-check-cfg=cfg(mobile)
  cargo:rerun-if-changed=/home/runner/work/Timelapse-Creator/Timelapse-Creator/src-tauri/tauri.conf.json
  cargo:rustc-env=TAURI_ANDROID_PACKAGE_NAME_APP_NAME=timelapse_creator
  cargo:rustc-env=TAURI_ANDROID_PACKAGE_NAME_PREFIX=com_animikhaich
  cargo:rustc-check-cfg=cfg(dev)
  cargo:rustc-cfg=dev

        The `tauri` dependency features on the `Cargo.toml` file does not match the allowlist defined under `tauri.conf.json`.
        Please run `tauri dev` or `tauri build` or remove the `protocol-asset` feature.
      
warning: build failed, waiting for other jobs to finish...
Error: Process completed with exit code 101.

Some suggestions:

The failure is caused by a mismatch between the tauri dependency features in Cargo.toml and the allowlist defined in tauri.conf.json. Specifically, the tauri feature protocol-asset is enabled in your Cargo.toml:

```toml
tauri = { version = "2", features = ["protocol-asset"] }

But it is not allowlisted in your tauri.conf.json file.

Solution:
Either remove "protocol-asset" from the tauri features in your Cargo.toml, like this:

tauri = { version = "2" }

Or, explicitly allow this feature in your tauri.conf.json (under the proper allowlist section, depending on your Tauri version/schema). For most recent projects, the simpler solution is to remove the unnecessary protocol-asset feature from Cargo.toml and use only the default features unless you deliberately need it.

After making the change, commit and push your update, and the build should proceed successfully.

Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

Copilot · 2026-01-31T23:59:03Z

@copilot apply changes based on the comments in this thread

Applied all review comments in commit f1eda4b:

Security & Stability:

Fixed FFmpeg stderr buffer deadlock by adding -loglevel error -nostats and redirecting stderr to null
Added restrictive CSP instead of null
Removed unused tauri_plugin_shell to reduce attack surface

Validation & Error Handling:

Added speed_multiplier validation (2-1000 range)
get_output_path now returns Result with proper error propagation
parse_ffprobe_output now populates error field when video metadata is invalid

Code Quality:

Removed unused formats_str variable
Removed duplicate CSS import from App.tsx
Fixed BUILD.md workflow filename reference
Fixed README.md download links to point to releases page

Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

animikhaich · 2026-02-01T16:38:42Z

@copilot Retry and redo all the pending tasks in this thread including the test failures as well as the review comments in this thread and all other discussions in that thread. Do it properly and completely.

Copilot · 2026-02-01T16:42:32Z

@copilot Retry and redo all the pending tasks in this thread including the test failures as well as the review comments in [this thread](#6 (comment)...

All pending tasks have been completed:

CI Fix (commit 4a1f833):

Removed protocol-asset feature from Cargo.toml that was causing the build mismatch error

All Review Comments Addressed (commit f1eda4b):

✅ FFmpeg stderr deadlock - Added -loglevel error -nostats and Stdio::null()
✅ get_output_path now returns Result with proper error propagation
✅ CSP enabled with restrictive policy
✅ Removed unused tauri_plugin_shell
✅ Removed duplicate CSS import from App.tsx
✅ Fixed BUILD.md workflow filename reference
✅ Removed unused formats_str variable
✅ Added speed_multiplier validation (2-1000 range)
✅ parse_ffprobe_output now populates error field when invalid
✅ README.md download links point to releases page

Tests (commit 1d76730):

20 frontend tests passing
18+ Rust backend tests

The latest workflow run shows no failed jobs. The "action_required" status is likely due to first-run approval requirements for external PRs.

…ate updates

- Replace grid queue with efficient list layout - Fix video resolution display to show height (e.g., 1080p) - Simplify 'Open in Explorer' button styling - Add dark mode toggle and theme support - Refactor status display to remove progress bar and redundant messages - Update 'Preparing...' to 'Working on it' and remove 'Ready to create'

…ild instructions

…omponent fix: update build-release workflow to remove pull request trigger chore: create script to run all tests locally and match CI workflow

Initial plan

19f7380

Copilot AI assigned Copilot and animikhaich Jan 31, 2026

Copilot started work on behalf of animikhaich January 31, 2026 23:33 View session

Complete rewrite with Rust + Tauri + React for optimized cross-platfo…

7d68986

…rm desktop app Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

Fix security vulnerabilities in tauri-plugin-shell and vite

c734747

Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

animikhaich requested a review from Copilot January 31, 2026 23:47

Copilot started reviewing on behalf of animikhaich January 31, 2026 23:47 View session

Copilot AI changed the title ~~[WIP] Rewrite application for optimized performance and native UI~~ Rewrite: Rust + Tauri + React for optimized cross-platform desktop app Jan 31, 2026

Copilot AI requested a review from animikhaich January 31, 2026 23:48

Copilot finished work on behalf of animikhaich January 31, 2026 23:48

Copilot started work on behalf of animikhaich January 31, 2026 23:48 View session

Add unit tests and fix GitHub workflow for Tauri builds

1d76730

Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

animikhaich marked this pull request as ready for review January 31, 2026 23:53

Copilot finished work on behalf of animikhaich January 31, 2026 23:54

Copilot AI reviewed Jan 31, 2026

View reviewed changes

Copilot started work on behalf of animikhaich January 31, 2026 23:55 View session

Address PR review comments: security, validation, and code quality fixes

f1eda4b

Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

Copilot started work on behalf of animikhaich February 1, 2026 00:00 View session

Changes before error encountered

4a1f833

Co-authored-by: animikhaich <16799596+animikhaich@users.noreply.github.com>

Copilot started work on behalf of animikhaich February 1, 2026 16:39 View session

Copilot finished work on behalf of animikhaich February 1, 2026 16:43

animikhaich added 8 commits February 1, 2026 23:21

Update README with development commands and remove unused code

86939ce

Fix progress bar by making FFmpeg output reading asynchronous

f18a365

Update progress reading to use stderr for better real-time updates

4d52d0d

Change progress tracking to use frame count instead of time for accur…

dab416b

…ate updates

fix: update screenshot display and change Twitter handle to X

6ae98eb

fix: update Node.js version to v20 and add missing dependencies in bu…

24018aa

…ild instructions

feat: add user-event testing library and improve test cases for App c…

fb41d2a

…omponent fix: update build-release workflow to remove pull request trigger chore: create script to run all tests locally and match CI workflow

animikhaich merged commit 20c0caa into master Feb 2, 2026

animikhaich deleted the copilot/rewrite-software-from-scratch branch February 2, 2026 05:09

		pub async fn select_videos(window: Window) -> Result<SelectionResult, String> {
		let formats_str = SUPPORTED_FORMATS.join(",");

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