Removing bad suggestion. In theory, we could change this signature to take a const reference to a string, but for now, I'm reverting it.

Author: jonoomph

include/FFmpegWriter.h

@@ -253,7 +253,7 @@ namespace openshot {
 
 		/// @brief Constructor for FFmpegWriter. Throws one of the following exceptions.
 		/// @param path The file path of the video file you want to open and read
-		FFmpegWriter(const std::string path);
+		FFmpegWriter(std::string path);
 
 		/// Close the writer
 		void Close();

src/FFmpegWriter.cpp

@@ -83,7 +83,7 @@ static int set_hwframe_ctx(AVCodecContext *ctx, AVBufferRef *hw_device_ctx, int6
 }
 #endif // HAVE_HW_ACCEL
 
-FFmpegWriter::FFmpegWriter(const std::string path) :
+FFmpegWriter::FFmpegWriter(std::string path) :
 		path(path), fmt(NULL), oc(NULL), audio_st(NULL), video_st(NULL), samples(NULL),
 		audio_outbuf(NULL), audio_outbuf_size(0), audio_input_frame_size(0), audio_input_position(0),
 		initial_audio_input_frame_size(0), img_convert_ctx(NULL), cache_size(8), num_of_rescalers(32),