diff --git a/jaenokhwa-core/src/pixel_format.rs b/jaenokhwa-core/src/pixel_format.rs
index a35eb8a..c6dc9d6 100644
--- a/jaenokhwa-core/src/pixel_format.rs
+++ b/jaenokhwa-core/src/pixel_format.rs
@@ -1,11 +1,11 @@
 use four_cc::FourCC;
 
-pub const YUV420: FourCC = FourCC(*b"420v");
-pub const MJPEG: FourCC = FourCC(*b"MJPG");
-pub const YUYV: FourCC = FourCC(*b"YUYV");
-pub const RAWRGB: FourCC = FourCC(*b"RGB3");
+pub const YUV420V: FourCC = FourCC(*b"420v");
+pub const MJPEG: FourCC = FourCC(*b"mjpg");
+pub const YUYV: FourCC = FourCC(*b"yuyv");
+pub const RAWRGB: FourCC = FourCC(*b"rgb3");
 pub const NV12: FourCC = FourCC(*b"nv12");
 pub const UYVY: FourCC = FourCC(*b"uyvy");
 // Also known as 2vuy
 pub const UYVY_APPLE: FourCC = FourCC(*b"2vuy");
-pub const GRAY: FourCC = FourCC(*b"GRAY");
+pub const GRAY: FourCC = FourCC(*b"gray");
diff --git a/src/convert_to_rgb.rs b/src/convert_to_rgb.rs
index c9e2365..ff43a80 100644
--- a/src/convert_to_rgb.rs
+++ b/src/convert_to_rgb.rs
@@ -3,8 +3,11 @@ use ffmpeg_next::{
     frame::Video,
     software::scaling::{Context, Flags},
 };
-use jaenokhwa_core::buffer::FrameBuffer;
-use jaenokhwa_core::pixel_format::{UYVY_APPLE, YUV420};
+use jaenokhwa_core::pixel_format::{UYVY, UYVY_APPLE, YUV420, YUV420V, YUYV};
+use jaenokhwa_core::{
+    buffer::FrameBuffer,
+    pixel_format::{GRAY, MJPEG, NV12, RAWRGB},
+};
 
 pub trait ConvertToRgb {
     fn convert_to_rgb(&self, _output_format: Pixel) -> Vec<u8> {
@@ -14,9 +17,21 @@ pub trait ConvertToRgb {
 
 impl ConvertToRgb for FrameBuffer {
     fn convert_to_rgb(&self, output_format: Pixel) -> Vec<u8> {
+        if self.source_frame_format() == MJPEG {
+            panic!("MJPEG format is not supported");
+        }
+
+        if self.source_frame_format() == RAWRGB {
+            return self.buffer().to_vec();
+        }
+
         let pixel_format = match self.source_frame_format() {
-            YUV420 => Pixel::YUV420P,
+            YUV420V => Pixel::YUV420P,
             UYVY_APPLE => Pixel::UYVY422,
+            NV12 => Pixel::NV12,
+            YUYV => Pixel::YUYV422,
+            UYVY => Pixel::UYVY422,
+            GRAY => Pixel::GRAY8,
             _ => panic!("Unsupported pixel format {}", self.source_frame_format()),
         };