Fix encoder not flushing the frames properly

Thanks IRC!

recording/encoders/encoder.cpp

@@ -145,6 +145,7 @@ bool Encoder::end() {
     if (!success) {
         goto cleanup;
     }
+    avcodec_send_frame(out->enc, NULL);
     int ret;
     AVPacket pkt;
     pkt.size = 0;

recording/recordingformats.cpp

@@ -31,7 +31,7 @@ RecordingFormats::RecordingFormats(formats::Recording f) {
     path = tmpDir.absoluteFilePath("res." + formats::recordingFormatName(f).toLower());
     finalizer = [&] {
         delete enc;
-        if (interrupt) {
+        if (interrupt || !frameAdded) {
             tmpDir.removeRecursively();
             return QByteArray();
         }
@@ -66,6 +66,7 @@ RecordingFormats::RecordingFormats(formats::Recording f) {
     };
     consumer = [&](QImage img) {
         if (!interrupt) try {
+                frameAdded = true;
                 enc->addFrame(img);
             } catch (std::runtime_error e) {
                 //                notifications::notify("KShare Video Encoder Error", e.what(),

recording/recordingformats.hpp

@@ -31,6 +31,7 @@ private:
     QString path;
     Encoder *enc = NULL;
     bool interrupt = false;
+    bool frameAdded = false;
     QString anotherFormat;
 };