From 22e0f006908fc13a77996dbd227d23ac374bf870 Mon Sep 17 00:00:00 2001
From: Kresna <kresna@usetada.com>
Date: Tue, 21 Jul 2026 20:43:20 +0700
Subject: [PATCH] fix(recording): capture audio and mux it correctly (silent
 recordings)
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Two bugs made every recording come out silent:
1. TauriCaptureService.startRecording dropped includeAudio/systemAudio before
   the IPC call, so Rust never started the AudioRecorder. Now forwarded.
2. The mux always used -c:a aac, but WebM (the default output) can't hold AAC —
   it needs Opus, so the mux failed and left a video-only file. Pick the audio
   codec by container: mp4 → aac, webm → libopus.

Also fixes a build break: the [lints.rust] check-cfg form added earlier is
invalid on current rustc (errored with "invalid --check-cfg argument"); switched
to `unexpected_cfgs = "allow"`.

macOS builds clean (0 warnings); 385 JS tests pass. Needs a mic-enabled recording
on hardware to confirm audio lands in the file.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013dqouzFP8vy9jaKhTDFj5H
---
 src-tauri/Cargo.toml          |  6 +++---
 src-tauri/src/audio.rs        | 10 +++++++++-
 src/services/capture/tauri.ts |  4 ++++
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index 04a3435..619d4cb 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -41,6 +41,6 @@ default = ["custom-protocol"]
 custom-protocol = ["tauri/custom-protocol"]
 
 [lints.rust]
-# The `objc` crate's msg_send! macro expands to a `cfg(cargo-clippy)` check;
-# declare it as a known cfg so it doesn't trip the unexpected_cfgs lint.
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(cargo-clippy)'] }
+# The `objc` crate's msg_send! macro references a `cargo-clippy` cfg that trips
+# the unexpected_cfgs lint — it's from the dependency macro, not our code.
+unexpected_cfgs = "allow"
diff --git a/src-tauri/src/audio.rs b/src-tauri/src/audio.rs
index 29179ef..7c2d11e 100644
--- a/src-tauri/src/audio.rs
+++ b/src-tauri/src/audio.rs
@@ -76,13 +76,21 @@ impl AudioRecorder {
             output_path.display()
         );
 
+        // The captured audio is AAC, but the container dictates the codec:
+        // WebM (VP9) can't hold AAC — it needs Opus; MP4 takes AAC. Using the
+        // wrong codec makes the mux fail, leaving a silent video-only file.
+        let audio_codec = match format {
+            "mp4" => "aac",
+            _ => "libopus", // webm
+        };
+
         let status = Command::new(ffmpeg_path())
             .args([
                 "-y",
                 "-i", &video_path.to_string_lossy(),
                 "-i", &audio_path.to_string_lossy(),
                 "-c:v", "copy",
-                "-c:a", "aac",
+                "-c:a", audio_codec,
                 "-shortest",
                 &output_path.to_string_lossy(),
             ])
diff --git a/src/services/capture/tauri.ts b/src/services/capture/tauri.ts
index a7d99eb..c8b8c14 100644
--- a/src/services/capture/tauri.ts
+++ b/src/services/capture/tauri.ts
@@ -66,6 +66,10 @@ export class TauriCaptureService implements CaptureService {
           fps: options?.fps,
           displayId: options?.displayId,
           bounds: options?.bounds,
+          // Without these the Rust side never starts the audio recorder,
+          // so recordings came out silent.
+          includeAudio: options?.includeAudio,
+          systemAudio: options?.systemAudio,
         },
       });