diff --git a/src/main.cpp b/src/main.cpp
index 8f3a346..7c2aeb9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -48,7 +48,7 @@ int main() {
 
 		mgs::ffmpeg::AVCodec avcodec{::AVCodecID::AV_CODEC_ID_MJPEG};
 		auto cam_frame_format = cam.frame_size();
-		auto decoder{avcodec.make_decoder(cam_frame_format.width, cam_frame_format.height, ::AVPixelFormat::AV_PIX_FMT_RGB24)};
+		auto decoder{avcodec.make_decoder(cam_frame_format.width, cam_frame_format.height, ::AVPixelFormat::AV_PIX_FMT_GRAY8)};
 
 		print_supported_frame_formats(cam);
 		cam.start_streaming();
@@ -67,7 +67,7 @@ int main() {
 		std::cout << "Decoded buffer size: " << out_data_size << '\n';
 
 		std::ofstream rgb_file_wr("rgb.data", std::ios::binary | std::ios::out);
-		rgb_file_wr.write(reinterpret_cast<const char*>(buff.data()), buff.size());
+		rgb_file_wr.write(reinterpret_cast<const char*>(buff.data()), out_data_size);
 	}
 	catch (const std::runtime_error& err) {
 		std::cerr << "Unhandled exception: " << err.what() << '\n';