choice audio track index, fix #348

assets/ffplayout.yml

@@ -69,6 +69,7 @@ processing:
     logo_opacity: 0.7
     logo_filter: overlay=W-w-12:12
     audio_tracks: 1
+    audio_track_index: -1
     audio_channels: 2
     volume: 1
     custom_filter:

ffplayout-engine/src/output/desktop.rs

@@ -24,6 +24,7 @@ pub fn output(config: &PlayoutConfig, log_format: &str) -> process::Child {
     if let Some(mut cmd) = config.out.output_cmd.clone() {
         if !cmd.iter().any(|i| {
             [
+                "-c",
                 "-c:v",
                 "-c:v:0",
                 "-b:v",

lib/src/filter/mod.rs

@@ -531,8 +531,18 @@ pub fn filter_chains(
         custom(&list_vf, &mut filters, 0, Video);
     }
 
-    if !config.processing.copy_audio {
+    let mut audio_indexes = vec![];
+
+    if config.processing.audio_track_index == -1 {
         for i in 0..config.processing.audio_tracks {
+            audio_indexes.push(i)
+        }
+    } else {
+        audio_indexes.push(config.processing.audio_track_index)
+    }
+
+    if !config.processing.copy_audio {
+        for i in audio_indexes {
             if node
                 .probe
                 .as_ref()
@@ -562,6 +572,8 @@ pub fn filter_chains(
             custom(&proc_af, &mut filters, i, Audio);
             custom(&list_af, &mut filters, i, Audio);
         }
+    } else if config.processing.audio_track_index > -1 {
+        error!("Setting audio_track_index other than -1 is not allowed in audio copy mode!")
     }
 
     if config.out.mode == HLS {

lib/src/utils/config.rs

@@ -213,6 +213,8 @@ pub struct Processing {
     pub mode: ProcessMode,
     #[serde(default)]
     pub audio_only: bool,
+    #[serde(default = "default_track_index")]
+    pub audio_track_index: i32,
     #[serde(default)]
     pub copy_audio: bool,
     #[serde(default)]
@@ -319,6 +321,10 @@ pub struct Out {
     pub output_cmd: Option<Vec<String>>,
 }
 
+fn default_track_index() -> i32 {
+    -1
+}
+
 fn default_tracks() -> i32 {
     1
 }