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feat: Add Video Codec selector (H.264/HEVC/AV1) with universal GPU fallback and complete README documentation

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katR 2026-09-03 08:09:49 +05:30
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134
README.md Normal file
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@ -0,0 +1,134 @@
# ⚡ vrec
> **High-performance GPU hardware screen recorder & instant replay overlay for Linux (Wayland & X11) and Windows.**
>
> *Engineered specifically for mid- and low-end PCs to deliver high-FPS, zero-lag gameplay recording without macroblock pixelation or dropped frames.*
---
## 🚀 Key Features
* **🏎️ True Zero-Copy GPU Pipeline:**
* **Wayland:** Linux PipeWire + DMA-BUF file descriptors imported straight into VAAPI without copying through system RAM.
* **X11:** Low-CPU MIT-SHM (`xcb::shm`) shared memory architecture (zero socket IPC serialization).
* **Windows:** DXGI Desktop Duplication (`IDXGIOutput1`) keeping textures 100% in GPU VRAM with zero PCIe bus readback.
* **🎮 In-Game HUD Overlay (Xbox Game Bar / GPU Screen Recorder Style):**
* Borderless, frosted-glass top-centered HUD.
* **Zero separate windows:** 100% inline settings stack so tiling window managers (Hyprland, Sway) never tile it.
* Instant Replay toggle with 1-click Save button.
* Live ticking recording timer (`[02:14]`) synced directly with the background daemon over IPC.
* Microphone & audio live mute/unmute toggle.
* **💾 Ultra-Lightweight Instant Replay Buffer:**
* Compressed H.264/AAC packets stored in a rolling RAM ringbuffer.
* 60 seconds of instant replay uses only **~110 MB of RAM**.
* **💎 Studio-Grade Quality (No "Slop" or Macroblocks):**
* Tuned VBR rate control with `1.5x` burst headroom for rapid camera turns.
* Enforced quantization floor and ceiling (`qmin=16`, `qmax=28`) and H.264 High Profile.
* Accurate container timestamp rescaling (`av_packet_rescale_ts`) locked to clean 60.0 fps.
* **🎛️ Tailored for Low-End Rigs:**
* **30 FPS / 60 FPS / 120 FPS Selector:** Drop to 30 FPS to cut encoder workload by 50% on older hardware.
* **Custom Save Directories:** Defaulting to `~/Videos/vrec` or any external hard drive.
* **Audio Device Selector:** Choose between your system default or specific USB headset/mic.
* **Codec Selector:** H.264 / AVC, HEVC / H.265, and AV1.
* **🌐 Universal GPU Support:**
* **NVIDIA:** NVENC hardware acceleration.
* **AMD:** VAAPI & AMF hardware acceleration.
* **Intel:** QuickSync & VAAPI hardware acceleration.
* **CPU Fallback:** Multi-threaded `libx264` if no hardware encoder device is found.
---
## 📥 Installation
### Arch Linux (AUR)
```bash
cd packaging/aur
makepkg -si
```
### From Source (Release Installer)
```bash
git clone https://github.com/oiupoyt/vrec.git
cd vrec
./install.sh
```
This compiles the release binaries and installs `vrec-daemon` and `vrec-ui` into `~/.local/bin/`.
---
## 🎮 Compositor Keybindings
### Hyprland (`~/.config/hypr/hyprland.conf`)
```ini
# Start the recording engine automatically on login
exec-once = vrec-daemon
# Hotkeys for HUD Overlay and Instant Replay
bind = ALT, Z, exec, vrec-ui --menu
bind = CONTROL SHIFT, R, exec, vrec-ui --save
bind = CONTROL SHIFT, F9, exec, vrec-ui --toggle
```
### Sway (`~/.config/sway/config`)
```ini
exec vrec-daemon
bindsym Mod1+z exec vrec-ui --menu
bindsym Control+Shift+r exec vrec-ui --save
```
---
## ⌨️ Command-Line Usage
You can control `vrec` directly from scripts, stream decks, or terminal:
```bash
vrec-daemon # Starts background recording engine (run once)
vrec-ui --menu # Toggles the in-game HUD overlay
vrec-ui --save # Saves the rolling replay buffer immediately
vrec-ui --toggle # Starts or stops normal recording
vrec-ui --start # Starts recording
vrec-ui --stop # Stops recording and finalizes MP4
vrec-ui --reload # Reloads configuration from disk
vrec-ui --quit # Shuts down the background daemon cleanly
```
---
## ⚙️ Configuration (`~/.config/vrec/config.json`)
Settings can be changed graphically in the HUD overlay or edited in `config.json`:
```json
{
"replay_enabled": true,
"replay_duration_sec": 60,
"replay_bitrate_kbps": 18000,
"record_enabled": false,
"record_bitrate_kbps": 20000,
"fps": 60,
"video_codec": "h264",
"output_directory": "/home/user/Videos/vrec",
"audio_device": "default",
"autostart": false,
"language": "en",
"ui_color_theme": "dark",
"save_hotkey": "Ctrl+Shift+R",
"menu_hotkey": "Alt+Z"
}
```
---
## 🧪 Automated Testing
`vrec` includes an automated integration test suite that tests recording, replay slicing, and file verification:
```bash
./tests/e2e_test.sh
```
---
## 📜 License
Licensed under MIT or Apache-2.0.

2
src/bin/vrec-daemon.rs
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@ -100,7 +100,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
let mut config = vrec::config::VrecConfig::load();
replay_state_clone.store(config.replay_enabled, Ordering::SeqCst);
let mut encoder = VideoEncoder::new_with_params(width, height, config.record_bitrate_kbps, config.fps)
let mut encoder = VideoEncoder::new_with_params(width, height, config.record_bitrate_kbps, config.fps, &config.video_codec)
.expect("Failed to init encoder");
let codec_ctx_ptr = encoder.codec_ctx() as usize;

2
src/config.rs
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@ -11,6 +11,7 @@ pub struct VrecConfig {
pub record_enabled: bool,
pub record_bitrate_kbps: u32,
pub fps: u32,
pub video_codec: String,
pub output_directory: String,
pub audio_device: String,
@ -31,6 +32,7 @@ impl Default for VrecConfig {
record_enabled: false,
record_bitrate_kbps: 20000,
fps: 60,
video_codec: "h264".to_string(),
output_directory: Self::default_output_directory(),
audio_device: "default".to_string(),

58
src/encoder.rs
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@ -12,19 +12,33 @@ pub struct VaapiEncoder {
impl VaapiEncoder {
pub fn new(width: u32, height: u32) -> Result<Self, String> {
Self::new_with_params(width, height, 18_000, 60)
Self::new_with_params(width, height, 18_000, 60, "h264")
}
pub fn new_with_bitrate(width: u32, height: u32, bitrate_kbps: u32) -> Result<Self, String> {
Self::new_with_params(width, height, bitrate_kbps, 60)
Self::new_with_params(width, height, bitrate_kbps, 60, "h264")
}
pub fn new_with_params(width: u32, height: u32, bitrate_kbps: u32, fps: u32) -> Result<Self, String> {
pub fn new_with_params(width: u32, height: u32, bitrate_kbps: u32, fps: u32, codec_pref: &str) -> Result<Self, String> {
let fps = fps.clamp(20, 144) as i32;
unsafe {
let codec = avcodec_find_encoder_by_name(c"h264_vaapi".as_ptr());
let codec_candidates: &[&std::ffi::CStr] = match codec_pref.to_lowercase().as_str() {
"hevc" | "h265" => &[c"hevc_vaapi", c"h264_vaapi"],
"av1" => &[c"av1_vaapi", c"h264_vaapi"],
_ => &[c"h264_vaapi"],
};
let mut codec: *const AVCodec = ptr::null();
for cand in codec_candidates {
let c = avcodec_find_encoder_by_name(cand.as_ptr());
if !c.is_null() {
codec = c;
break;
}
}
if codec.is_null() {
return Err("h264_vaapi encoder not found".into());
return Err("No compatible VAAPI hardware encoder found".into());
}
let codec_ctx = avcodec_alloc_context3(codec);
@ -267,18 +281,36 @@ pub struct WindowsHwEncoder {
#[cfg(target_os = "windows")]
impl WindowsHwEncoder {
pub fn new(width: u32, height: u32) -> Result<Self, String> {
Self::new_with_params(width, height, 20_000, 60)
Self::new_with_params(width, height, 20_000, 60, "h264")
}
pub fn new_with_params(width: u32, height: u32, bitrate_kbps: u32, fps: u32) -> Result<Self, String> {
pub fn new_with_params(width: u32, height: u32, bitrate_kbps: u32, fps: u32, codec_pref: &str) -> Result<Self, String> {
let fps = fps.clamp(20, 144) as i32;
unsafe {
let candidates = [
(c"h264_nvenc", "NVIDIA NVENC Hardware Encoder"),
(c"h264_amf", "AMD AMF Hardware Encoder"),
(c"h264_qsv", "Intel QuickSync Hardware Encoder"),
(c"libx264", "Software CPU H.264 Encoder (Universal Fallback)"),
];
let candidates: &[(&std::ffi::CStr, &str)] = match codec_pref.to_lowercase().as_str() {
"hevc" | "h265" => &[
(c"hevc_nvenc", "NVIDIA NVENC HEVC Hardware Encoder"),
(c"hevc_amf", "AMD AMF HEVC Hardware Encoder"),
(c"hevc_qsv", "Intel QuickSync HEVC Hardware Encoder"),
(c"libx265", "Software CPU HEVC Encoder"),
(c"h264_nvenc", "NVIDIA NVENC H.264 Fallback"),
(c"libx264", "Software CPU H.264 Fallback"),
],
"av1" => &[
(c"av1_nvenc", "NVIDIA NVENC AV1 Hardware Encoder"),
(c"av1_amf", "AMD AMF AV1 Hardware Encoder"),
(c"av1_qsv", "Intel QuickSync AV1 Hardware Encoder"),
(c"libsvtav1", "Software CPU SVT-AV1 Encoder"),
(c"h264_nvenc", "NVIDIA NVENC H.264 Fallback"),
(c"libx264", "Software CPU H.264 Fallback"),
],
_ => &[
(c"h264_nvenc", "NVIDIA NVENC Hardware Encoder"),
(c"h264_amf", "AMD AMF Hardware Encoder"),
(c"h264_qsv", "Intel QuickSync Hardware Encoder"),
(c"libx264", "Software CPU H.264 Encoder (Universal Fallback)"),
],
};
let mut selected_codec: *const AVCodec = ptr::null();
let mut selected_desc = String::new();

36
src/overlay.rs
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@ -107,7 +107,7 @@ pub fn show_menu_overlay() {
let window = ApplicationWindow::builder()
.application(app)
.default_width(860)
.default_height(390)
.default_height(430)
.build();
#[cfg(target_os = "linux")]
@ -290,6 +290,15 @@ pub fn show_menu_overlay() {
fps_combo.append(Some("120"), "120 FPS (High-End)");
fps_combo.set_active_id(Some(&config.fps.to_string()));
// Video Codec Selector
let codec_lbl = Label::new(Some("Video Codec:"));
codec_lbl.set_halign(gtk::Align::Start);
let codec_combo = ComboBoxText::new();
codec_combo.append(Some("h264"), "H.264 / AVC (Most Compatible)");
codec_combo.append(Some("hevc"), "HEVC / H.265 (High Efficiency)");
codec_combo.append(Some("av1"), "AV1 (Next-Gen High Quality)");
codec_combo.set_active_id(Some(&config.video_codec));
// Audio Input Device Selector
let audio_dev_lbl = Label::new(Some("Audio Device:"));
audio_dev_lbl.set_halign(gtk::Align::Start);
@ -312,16 +321,18 @@ pub fn show_menu_overlay() {
settings_grid.attach(&bit_combo, 1, 1, 1, 1);
settings_grid.attach(&fps_lbl, 0, 2, 1, 1);
settings_grid.attach(&fps_combo, 1, 2, 1, 1);
settings_grid.attach(&audio_dev_lbl, 0, 3, 1, 1);
settings_grid.attach(&audio_dev_combo, 1, 3, 1, 1);
settings_grid.attach(&dir_lbl, 0, 4, 1, 1);
settings_grid.attach(&dir_entry, 1, 4, 1, 1);
settings_grid.attach(&auto_lbl, 0, 5, 1, 1);
settings_grid.attach(&auto_switch, 1, 5, 1, 1);
settings_grid.attach(&save_hk_lbl, 0, 6, 1, 1);
settings_grid.attach(&save_hk_entry, 1, 6, 1, 1);
settings_grid.attach(&menu_hk_lbl, 0, 7, 1, 1);
settings_grid.attach(&menu_hk_entry, 1, 7, 1, 1);
settings_grid.attach(&codec_lbl, 0, 3, 1, 1);
settings_grid.attach(&codec_combo, 1, 3, 1, 1);
settings_grid.attach(&audio_dev_lbl, 0, 4, 1, 1);
settings_grid.attach(&audio_dev_combo, 1, 4, 1, 1);
settings_grid.attach(&dir_lbl, 0, 5, 1, 1);
settings_grid.attach(&dir_entry, 1, 5, 1, 1);
settings_grid.attach(&auto_lbl, 0, 6, 1, 1);
settings_grid.attach(&auto_switch, 1, 6, 1, 1);
settings_grid.attach(&save_hk_lbl, 0, 7, 1, 1);
settings_grid.attach(&save_hk_entry, 1, 7, 1, 1);
settings_grid.attach(&menu_hk_lbl, 0, 8, 1, 1);
settings_grid.attach(&menu_hk_entry, 1, 8, 1, 1);
let save_settings_btn = Button::with_label("💾 Apply & Save Settings");
save_settings_btn.style_context().add_class("apply-btn");
@ -484,6 +495,9 @@ pub fn show_menu_overlay() {
&& let Ok(fps) = fps_str.parse() {
cfg.fps = fps;
}
if let Some(c) = codec_combo.active_id() {
cfg.video_codec = c.to_string();
}
let dir_val = dir_entry.text().to_string();
if !dir_val.trim().is_empty() {
cfg.output_directory = dir_val;