Merge pull request #44 from ordinall/master

added dynamic cmd

lib/rtsp-ffmpeg.js

@@ -16,6 +16,7 @@ const spawn = require('child_process').spawn
  * @param {string} [options.resolution] Resolution in WxH format
  * @param {string|number} [options.quality] JPEG quality
  * @param {Array<string>} [options.arguments] Custom arguments for ffmpeg
+ * @param {string} [options.cmd] use custom binary path instead of 'ffmpeg' in path
  * @constructor
  */
 var FFMpeg = function(options) {
@@ -29,6 +30,7 @@ var FFMpeg = function(options) {
 	this.quality = (options.quality === undefined || options.quality === "") ? 3 : options.quality;
 	this.arguments = options.arguments || [];
 	this.buffs = []; // Store the entire data image into this variable. This attribute is replaced each time a full image is received from the stream.
+	this.cmd = options.cmd || FFMpeg.cmd || 'ffmpeg';
 
 	this.on('newListener', newListener.bind(this));
 	this.on('removeListener', removeListener.bind(this));
@@ -65,6 +67,10 @@ function observer(changes) {
 	}
 }
 
+FFMpeg.prototype._cmd = function() {
+	return this.cmd;
+}
+
 FFMpeg.prototype._args = function() {
 	return this.arguments.concat([
 		'-loglevel', 'quiet',
@@ -87,7 +93,7 @@ FFMpeg.prototype._args = function() {
  */
 FFMpeg.prototype.start = function() {
 	var self = this;
-	this.child = spawn(FFMpeg.cmd, this._args());
+	this.child = spawn(this._cmd(), this._args());
 	this.child.stdout.on('data', function(data){
 	//The image can be composed of one or multiple chunk when receiving stream data.
 	//Store all bytes into an array until we meet flag "FF D9" that mean it's the end of the image then we can send all data in order to display the full image.