M src/platform/ffmpeg/ffmpeg-encoder.c → src/platform/ffmpeg/ffmpeg-encoder.c

@@ -282,6 +282,10 @@ avformat_free_context(encoder->context);
 	encoder->context = 0;
 }
 
+bool FFmpegEncoderIsOpen(struct FFmpegEncoder* encoder) {
+	return !!encoder->context;
+}
+
 void _ffmpegPostAudioFrame(struct GBAAVStream* stream, int32_t left, int32_t right) {
 	struct FFmpegEncoder* encoder = (struct FFmpegEncoder*) stream;
 	if (!encoder->context) {

M src/platform/ffmpeg/ffmpeg-encoder.h → src/platform/ffmpeg/ffmpeg-encoder.h

@@ -50,5 +50,6 @@ void FFmpegEncoderSetDimensions(struct FFmpegEncoder*, int width, int height);
 bool FFmpegEncoderVerifyContainer(struct FFmpegEncoder*);
 bool FFmpegEncoderOpen(struct FFmpegEncoder*, const char* outfile);
 void FFmpegEncoderClose(struct FFmpegEncoder*);
+bool FFmpegEncoderIsOpen(struct FFmpegEncoder*);
 
 #endif

M src/platform/qt/VideoView.cpp → src/platform/qt/VideoView.cpp

@@ -274,7 +274,7 @@ m_ui.advancedBox->setVisible(show);
 }
 
 bool VideoView::validateSettings() {
-	bool valid = true;
+	bool valid = !m_filename.isNull() && !FFmpegEncoderIsOpen(&m_encoder);
 	if (!m_audioCodecCstr) {
 		valid = false;
 		m_ui.audio->setStyleSheet("QComboBox { color: red; }");
@@ -302,7 +302,7 @@ if (valid && !FFmpegEncoderVerifyContainer(&m_encoder)) {
 		valid = false;
 	}
 
-	m_ui.start->setEnabled(valid && !m_filename.isNull());
+	m_ui.start->setEnabled(valid);
 
 	return valid;
 }