Added the initial API of the FFmpegWriter class, and tweaked the build scripts and reader class.

src/FFmpegWriter.cpp

@@ -0,0 +1,61 @@
+#include "../include/FFmpegWriter.h"
+
+using namespace openshot;
+
+FFmpegWriter::FFmpegWriter(string path) throw(InvalidFile, InvalidFormat, InvalidCodec)
+{
+	// Init FileInfo struct (clear all values)
+	InitFileInfo();
+
+	// Initialize FFMpeg, and register all formats and codecs
+	av_register_all();
+}
+
+// Set video export options
+void FFmpegWriter::SetVideoOptions(string codec, Fraction fps, int width, int height, Fraction display_ratio,
+		Fraction pixel_ratio, bool interlaced, bool top_field_first, int bit_rate)
+{
+
+}
+
+// Set audio export options
+void FFmpegWriter::SetAudioOptions(string codec, int sample_rate, int channels, int bit_rate)
+{
+
+}
+
+// Set custom options (some codecs accept additional params)
+void FFmpegWriter::SetOption(Stream_Type stream, string name, double value)
+{
+
+}
+
+// Write the file header (after the options are set)
+void FFmpegWriter::WriteHeader()
+{
+
+}
+
+// Write a single frame
+void FFmpegWriter::WriteFrame(Frame frame)
+{
+
+}
+
+// Write a block of frames from a reader
+void FFmpegWriter::WriteFrame(FileReaderBase* reader, int start, int length)
+{
+
+}
+
+// Write the file trailer (after all frames are written)
+void FFmpegWriter::WriteTrailer()
+{
+
+}
+
+// Close the writer
+void FFmpegWriter::Close()
+{
+
+}