Fixed order

lib/Voice/AudioEncoder.js

@@ -19,6 +19,7 @@ var AudioEncoder = (function () {
 		if (opus) {
 			this.opus = new opus.OpusEncoder(48000, 1);
 		}
+		this.choice = false;
 	}
 
 	AudioEncoder.prototype.opusBuffer = function opusBuffer(buffer) {
@@ -26,12 +27,42 @@ var AudioEncoder = (function () {
 		return this.opus.encode(buffer, 1920);
 	};
 
+	AudioEncoder.prototype.getCommand = function getCommand(force) {
+
+		if (this.choice && force) return choice;
+
+		var choices = ["avconv", "ffmpeg"];
+
+		for (var _iterator = choices, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
+			var _ref;
+
+			if (_isArray) {
+				if (_i >= _iterator.length) break;
+				_ref = _iterator[_i++];
+			} else {
+				_i = _iterator.next();
+				if (_i.done) break;
+				_ref = _i.value;
+			}
+
+			var choice = _ref;
+
+			var p = cpoc.spawnSync(choice);
+			if (!p.error) {
+				this.choice = choice;
+				return choice;
+			}
+		}
+
+		return "help";
+	};
+
 	AudioEncoder.prototype.encodeStream = function encodeStream(stream) {
 		var callback = arguments.length <= 1 || arguments[1] === undefined ? function (err, buffer) {} : arguments[1];
 
 		var self = this;
 		return new Promise(function (resolve, reject) {
-			var enc = cpoc.spawn("ffmpeg", ["-f", "s16le", "-ar", "48000", "-ac", "1", // this can be 2 but there's no point, discord makes it mono on playback, wasted bandwidth.
+			var enc = cpoc.spawn(self.getCommand(), ["-f", "s16le", "-ar", "48000", "-ac", "1", // this can be 2 but there's no point, discord makes it mono on playback, wasted bandwidth.
 			"-af", "volume=1", "pipe:1", "-i", "-"]);
 
 			stream.pipe(enc.stdin);

src/Voice/AudioEncoder.js

@@ -15,6 +15,7 @@ class AudioEncoder{
 		if(opus){	
 			this.opus = new opus.OpusEncoder(48000, 1);
 		}
+		this.choice = false;
 	}
 	
 	opusBuffer(buffer){
@@ -23,10 +24,28 @@ class AudioEncoder{
 		
 	}
 	
+	getCommand(force){
+		
+		if(this.choice && force)
+			return choice;
+		
+		var choices = ["avconv", "ffmpeg"];
+		
+		for(var choice of choices){
+			var p = cpoc.spawnSync(choice);
+			if(!p.error){
+				this.choice = choice;
+				return choice;
+			}
+		}
+		
+		return "help";
+	}
+	
 	encodeStream(stream, callback=function(err, buffer){}){
 		var self = this;
 		return new Promise((resolve, reject) => {
-			var enc = cpoc.spawn("ffmpeg" , [
+			var enc = cpoc.spawn(self.getCommand() , [
 				"-f", "s16le",
 				"-ar", "48000",
 				"-ac", "1", // this can be 2 but there's no point, discord makes it mono on playback, wasted bandwidth.