feat(encode): extract and mix embedded video audio

crates/rustmotion-core/src/schema/scenario.rs

@@ -211,7 +211,7 @@ pub struct FontEntry {
     pub family: String,
 }
 
-#[derive(Debug, Serialize, Deserialize, JsonSchema)]
+#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
 pub struct AudioTrack {
     pub src: String,
     #[serde(default)]

crates/rustmotion/src/encode/mod.rs

@@ -1,5 +1,6 @@
 pub mod audio;
 pub mod video;
+pub mod video_audio;
 
 pub use video::build_frame_tasks;
 pub use video::encode_gif;

crates/rustmotion/src/encode/video/ffmpeg.rs

@@ -35,18 +35,26 @@ pub fn encode_with_ffmpeg(
         return Err(RustmotionError::NoFrames);
     }
 
-    // Process audio
+    // Process audio — merge scenario.audio with tracks extracted from embedded
+    // video components.
     let total_duration = total_frames as f64 / fps as f64;
-    let audio_tmp_dir = if !scenario.audio.is_empty() {
+    let video_tracks = super::super::video_audio::collect_video_audio_tracks(scenario);
+    let merged_audio: Vec<crate::schema::AudioTrack> = {
+        let mut all = scenario.audio.clone();
+        all.extend(video_tracks);
+        all
+    };
+
+    let audio_tmp_dir = if !merged_audio.is_empty() {
         Some(std::env::temp_dir().join(format!("rustmotion_audio_{}", std::process::id())))
     } else {
         None
     };
-    let pcm_data = if !scenario.audio.is_empty() {
+    let pcm_data = if !merged_audio.is_empty() {
         if let Some(ref tmp_dir) = audio_tmp_dir {
             std::fs::create_dir_all(tmp_dir)?;
         }
-        super::super::audio::mix_audio_tracks(&scenario.audio, total_duration)?
+        super::super::audio::mix_audio_tracks(&merged_audio, total_duration)?
     } else {
         None
     };

crates/rustmotion/src/encode/video/mux.rs

@@ -15,8 +15,16 @@ pub(super) fn mux_h264_to_mp4(
     scenario: &Scenario,
     total_duration: f64,
 ) -> Result<()> {
-    let pcm_data = if !scenario.audio.is_empty() {
-        super::super::audio::mix_audio_tracks(&scenario.audio, total_duration)?
+    // Collect audio from embedded video components and merge with scenario.audio.
+    let video_tracks = super::super::video_audio::collect_video_audio_tracks(scenario);
+    let merged_audio: Vec<crate::schema::AudioTrack> = {
+        let mut all = scenario.audio.clone();
+        all.extend(video_tracks);
+        all
+    };
+
+    let pcm_data = if !merged_audio.is_empty() {
+        super::super::audio::mix_audio_tracks(&merged_audio, total_duration)?
     } else {
         None
     };