diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
index 5bdea70..5f33add 100644
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,12 +1,2 @@
-# These are supported funding model platforms
-
 github: k4yt3x
 patreon: k4yt3x
-open_collective: # Replace with a single Open Collective username
-ko_fi: # Replace with a single Ko-fi username
-tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
-community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
-liberapay: # Replace with a single Liberapay username
-issuehunt: # Replace with a single IssueHunt username
-otechie: # Replace with a single Otechie username
-custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 55771a9..86af44d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,6 +28,13 @@ if(CMAKE_BUILD_TYPE STREQUAL "Release")
     endif()
 endif()
 
+# Set global compile options for all targets
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    add_compile_options(/W4 /permissive-)
+elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    add_compile_options(-Wall -Wextra -Wpedantic -Wconversion -Wshadow)
+endif()
+
 # Build options
 option(BUILD_SHARED_LIBS "Build libvideo2x as a shared library" ON)
 option(BUILD_VIDEO2X_CLI "Build the video2x executable" ON)
@@ -307,7 +314,6 @@ target_include_directories(libvideo2x PRIVATE
 
 # Compile options for the shared library
 target_compile_options(libvideo2x PRIVATE
-    -Wall
     -fPIC
     $<$<CONFIG:Release>:-Ofast>
     $<$<CONFIG:Debug>:-g -DDEBUG>
@@ -344,10 +350,7 @@ if (BUILD_VIDEO2X_CLI)
     )
 
     # Compile options for the executable
-    target_compile_options(video2x PRIVATE
-        -Wall
-        $<$<CONFIG:Debug>:-g -DDEBUG>
-    )
+    target_compile_options(video2x PRIVATE $<$<CONFIG:Debug>:-g -DDEBUG>)
 
     # Link the executable with the shared library
     target_link_libraries(video2x PRIVATE ${ALL_LIBRARIES} libvideo2x)
diff --git a/include/libvideo2x/libplacebo_filter.h b/include/libvideo2x/libplacebo_filter.h
index fd62932..f03a8ef 100644
--- a/include/libvideo2x/libplacebo_filter.h
+++ b/include/libvideo2x/libplacebo_filter.h
@@ -28,7 +28,7 @@ class LibplaceboFilter : public Filter {
     LibplaceboFilter(int width, int height, const std::filesystem::path &shader_path);
 
     // Destructor
-    virtual ~LibplaceboFilter();
+    virtual ~LibplaceboFilter() override;
 
     // Initializes the filter with decoder and encoder contexts
     int init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, AVBufferRef *hw_ctx) override;
diff --git a/include/libvideo2x/realesrgan_filter.h b/include/libvideo2x/realesrgan_filter.h
index 1415b94..e046c1f 100644
--- a/include/libvideo2x/realesrgan_filter.h
+++ b/include/libvideo2x/realesrgan_filter.h
@@ -36,7 +36,7 @@ class RealesrganFilter : public Filter {
     );
 
     // Destructor
-    virtual ~RealesrganFilter();
+    virtual ~RealesrganFilter() override;
 
     // Initializes the filter with decoder and encoder contexts
     int init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, AVBufferRef *hw_ctx) override;
diff --git a/src/conversions.cpp b/src/conversions.cpp
index 147e9dc..9d6ae3d 100644
--- a/src/conversions.cpp
+++ b/src/conversions.cpp
@@ -1,5 +1,6 @@
 #include "conversions.h"
 
+#include <cstddef>
 #include <cstdio>
 
 #include <spdlog/spdlog.h>
@@ -79,14 +80,16 @@ ncnn::Mat avframe_to_ncnn_mat(AVFrame *frame) {
     // Allocate a new ncnn::Mat and copy the data
     int width = converted_frame->width;
     int height = converted_frame->height;
-    ncnn::Mat ncnn_image = ncnn::Mat(width, height, (size_t)3, 3);  // BGR has 3 channels
+    ncnn::Mat ncnn_image = ncnn::Mat(width, height, 3, 3);  // BGR has 3 channels
 
     // Manually copy the pixel data from AVFrame to the new ncnn::Mat
     const uint8_t *src_data = converted_frame->data[0];
     for (int y = 0; y < height; y++) {
         uint8_t *dst_row = ncnn_image.row<uint8_t>(y);
         const uint8_t *src_row = src_data + y * converted_frame->linesize[0];
-        memcpy(dst_row, src_row, width * 3);  // Copy 3 channels (BGR) per pixel
+
+        // Copy 3 channels (BGR) per pixel
+        memcpy(dst_row, src_row, static_cast<size_t>(width) * 3);
     }
 
     // If we allocated a converted frame, free it
@@ -143,7 +146,9 @@ AVFrame *ncnn_mat_to_avframe(const ncnn::Mat &mat, AVPixelFormat pix_fmt) {
     for (int y = 0; y < mat.h; y++) {
         uint8_t *dst_row = bgr_frame->data[0] + y * bgr_frame->linesize[0];
         const uint8_t *src_row = mat.row<const uint8_t>(y);
-        memcpy(dst_row, src_row, mat.w * 3);  // Copy 3 channels (BGR) per pixel
+
+        // Copy 3 channels (BGR) per pixel
+        memcpy(dst_row, src_row, static_cast<size_t>(mat.w) * 3);
     }
 
     // Step 3: Convert the BGR frame to the desired pixel format
diff --git a/src/decoder.cpp b/src/decoder.cpp
index 27f20a3..48ae246 100644
--- a/src/decoder.cpp
+++ b/src/decoder.cpp
@@ -9,7 +9,7 @@
 static enum AVPixelFormat hw_pix_fmt = AV_PIX_FMT_NONE;
 
 // Callback function to choose the hardware-accelerated pixel format
-static enum AVPixelFormat get_hw_format(AVCodecContext *ctx, const enum AVPixelFormat *pix_fmts) {
+static enum AVPixelFormat get_hw_format(AVCodecContext *_, const enum AVPixelFormat *pix_fmts) {
     for (const enum AVPixelFormat *p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
         if (*p == hw_pix_fmt) {
             return *p;
@@ -55,7 +55,8 @@ int init_decoder(
     const AVCodec *decoder = avcodec_find_decoder(video_stream->codecpar->codec_id);
     if (!decoder) {
         spdlog::error(
-            "Failed to find decoder for codec ID {}", (int)video_stream->codecpar->codec_id
+            "Failed to find decoder for codec ID {}",
+            static_cast<int>(video_stream->codecpar->codec_id)
         );
         return AVERROR_DECODER_NOT_FOUND;
     }
diff --git a/src/encoder.cpp b/src/encoder.cpp
index 0486e75..29fdeb8 100644
--- a/src/encoder.cpp
+++ b/src/encoder.cpp
@@ -93,7 +93,7 @@ int init_encoder(
 
     // Set the CRF and preset for any codecs that support it
     char crf_str[16];
-    snprintf(crf_str, sizeof(crf_str), "%.f", encoder_config->crf);
+    snprintf(crf_str, sizeof(crf_str), "%.f", static_cast<double>(encoder_config->crf));
     av_opt_set(codec_ctx->priv_data, "crf", crf_str, 0);
     av_opt_set(codec_ctx->priv_data, "preset", encoder_config->preset, 0);
 
@@ -116,7 +116,8 @@ int init_encoder(
 
     if (encoder_config->copy_streams) {
         // Allocate the stream map
-        *stream_map = (int *)av_malloc_array(ifmt_ctx->nb_streams, sizeof(**stream_map));
+        *stream_map =
+            reinterpret_cast<int *>(av_malloc_array(ifmt_ctx->nb_streams, sizeof(**stream_map)));
         if (!*stream_map) {
             spdlog::error("Could not allocate stream mapping");
             return AVERROR(ENOMEM);
@@ -126,7 +127,7 @@ int init_encoder(
         (*stream_map)[vstream_idx] = stream_index++;
 
         // Loop through each stream in the input file
-        for (int i = 0; i < ifmt_ctx->nb_streams; i++) {
+        for (int i = 0; i < static_cast<int>(ifmt_ctx->nb_streams); i++) {
             AVStream *in_stream = ifmt_ctx->streams[i];
             AVCodecParameters *in_codecpar = in_stream->codecpar;
 
@@ -142,21 +143,21 @@ int init_encoder(
             }
 
             // Create corresponding output stream
-            AVStream *out_stream = avformat_new_stream(fmt_ctx, NULL);
-            if (!out_stream) {
+            AVStream *out_copied_stream = avformat_new_stream(fmt_ctx, NULL);
+            if (!out_copied_stream) {
                 spdlog::error("Failed allocating output stream");
                 return AVERROR_UNKNOWN;
             }
 
-            ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
+            ret = avcodec_parameters_copy(out_copied_stream->codecpar, in_codecpar);
             if (ret < 0) {
                 spdlog::error("Failed to copy codec parameters");
                 return ret;
             }
-            out_stream->codecpar->codec_tag = 0;
+            out_copied_stream->codecpar->codec_tag = 0;
 
             // Copy time base
-            out_stream->time_base = in_stream->time_base;
+            out_copied_stream->time_base = in_stream->time_base;
 
             (*stream_map)[i] = stream_index++;
         }
diff --git a/src/fsutils.cpp b/src/fsutils.cpp
index a0c7447..6eec2d4 100644
--- a/src/fsutils.cpp
+++ b/src/fsutils.cpp
@@ -11,7 +11,7 @@
 #include <spdlog/spdlog.h>
 
 #if _WIN32
-std::filesystem::path get_executable_directory() {
+static std::filesystem::path get_executable_directory() {
     std::vector<wchar_t> filepath(MAX_PATH);
 
     // Get the executable path, expanding the buffer if necessary
@@ -36,7 +36,7 @@ std::filesystem::path get_executable_directory() {
     return execpath.parent_path();
 }
 #else   // _WIN32
-std::filesystem::path get_executable_directory() {
+static std::filesystem::path get_executable_directory() {
     std::error_code ec;
     std::filesystem::path filepath = std::filesystem::read_symlink("/proc/self/exe", ec);
 
diff --git a/src/libvideo2x.cpp b/src/libvideo2x.cpp
index 3034eda..7026e6f 100644
--- a/src/libvideo2x.cpp
+++ b/src/libvideo2x.cpp
@@ -3,7 +3,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <cstdint>
 #include <thread>
 
 #include <spdlog/spdlog.h>
@@ -30,7 +29,7 @@
  * @param[in] benchmark Flag to enable benchmarking mode
  * @return int 0 on success, negative value on error
  */
-int process_frames(
+static int process_frames(
     EncoderConfig *encoder_config,
     VideoProcessingContext *proc_ctx,
     AVFormatContext *ifmt_ctx,
@@ -54,7 +53,7 @@ int process_frames(
         spdlog::error("Failed to open video file with OpenCV");
         return -1;
     }
-    proc_ctx->total_frames = cap.get(cv::CAP_PROP_FRAME_COUNT);
+    proc_ctx->total_frames = static_cast<int64_t>(cap.get(cv::CAP_PROP_FRAME_COUNT));
     cap.release();
 
     // Check if the total number of frames is still 0
@@ -208,7 +207,7 @@ end:
 }
 
 // Cleanup resources after processing the video
-void cleanup(
+static void cleanup(
     AVFormatContext *ifmt_ctx,
     AVFormatContext *ofmt_ctx,
     AVCodecContext *dec_ctx,
@@ -343,6 +342,11 @@ extern "C" int process_video(
             // Calculate the output dimensions based on the scaling factor
             output_width = dec_ctx->width * filter_config->config.realesrgan.scaling_factor;
             output_height = dec_ctx->height * filter_config->config.realesrgan.scaling_factor;
+            break;
+        default:
+            spdlog::error("Unknown filter type");
+            cleanup(ifmt_ctx, ofmt_ctx, dec_ctx, enc_ctx, hw_ctx, stream_map, filter);
+            return -1;
     }
     spdlog::info("Output video dimensions: {}x{}", output_width, output_height);
 
diff --git a/src/realesrgan_filter.cpp b/src/realesrgan_filter.cpp
index db83b15..fbe35ce 100644
--- a/src/realesrgan_filter.cpp
+++ b/src/realesrgan_filter.cpp
@@ -32,7 +32,7 @@ RealesrganFilter::~RealesrganFilter() {
     }
 }
 
-int RealesrganFilter::init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, AVBufferRef *hw_ctx) {
+int RealesrganFilter::init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, AVBufferRef *_) {
     // Construct the model paths using std::filesystem
     std::filesystem::path model_param_path;
     std::filesystem::path model_bin_path;
@@ -113,7 +113,7 @@ int RealesrganFilter::process_frame(AVFrame *in_frame, AVFrame **out_frame) {
     // Allocate space for ouptut ncnn::Mat
     int output_width = in_mat.w * realesrgan->scale;
     int output_height = in_mat.h * realesrgan->scale;
-    ncnn::Mat out_mat = ncnn::Mat(output_width, output_height, (size_t)3, 3);
+    ncnn::Mat out_mat = ncnn::Mat(output_width, output_height, 3, 3);
 
     ret = realesrgan->process(in_mat, out_mat);
     if (ret != 0) {
diff --git a/src/video2x.c b/src/video2x.c
index 184429f..d27771c 100644
--- a/src/video2x.c
+++ b/src/video2x.c
@@ -134,7 +134,9 @@ int is_valid_realesrgan_model(const char *model) {
     if (!model) {
         return 0;
     }
-    for (int i = 0; i < sizeof(valid_realesrgan_models) / sizeof(valid_realesrgan_models[0]); i++) {
+    for (unsigned long i = 0;
+         i < sizeof(valid_realesrgan_models) / sizeof(valid_realesrgan_models[0]);
+         i++) {
         if (strcmp(model, valid_realesrgan_models[i]) == 0) {
             return 1;
         }
@@ -142,7 +144,7 @@ int is_valid_realesrgan_model(const char *model) {
     return 0;
 }
 
-void print_help() {
+void print_help(void) {
     printf("Usage: video2x [OPTIONS]\n");
     printf("\nOptions:\n");
     printf(
@@ -245,7 +247,7 @@ void parse_arguments(int argc, char **argv, struct arguments *arguments) {
                 }
                 break;
             case 'q':
-                arguments->crf = atof(optarg);
+                arguments->crf = (float)atof(optarg);
                 if (arguments->crf < 0.0 || arguments->crf > 51.0) {
                     fprintf(stderr, "Error: CRF must be between 0 and 51.\n");
                     exit(1);