From a70333b46389d2574d70f77513ed8efb357e164f Mon Sep 17 00:00:00 2001
From: Eli Mallon <eli@livepeer.org>
Date: Tue, 23 Jan 2024 00:28:19 +0000
Subject: [PATCH 1/2] ffmpeg: move back to scale_cuda from scale_npp

---
 ffmpeg/ffmpeg.go | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/ffmpeg/ffmpeg.go b/ffmpeg/ffmpeg.go
index 38410203c0..bb22a51e68 100755
--- a/ffmpeg/ffmpeg.go
+++ b/ffmpeg/ffmpeg.go
@@ -9,7 +9,6 @@ import (
 	"os"
 	"path"
 	"path/filepath"
-	"runtime"
 	"strconv"
 	"strings"
 	"sync"
@@ -1115,21 +1114,11 @@ func ffmpegStrEscape(origStr string) string {
 }
 
 func hwScale() string {
-	if runtime.GOOS == "windows" {
-		// we don't build windows binaries with CUDA SDK, so need to use scale_cuda instead of scale_npp
-		return "scale_cuda"
-	} else {
-		return "scale_npp"
-	}
+	return "scale_cuda"
 }
 
 func hwScaleAlgo() string {
-	if runtime.GOOS == "windows" {
-		// we don't build windows binaries with CUDA SDK, so need to use the default scale algorithm
-		return ""
-	} else {
-		return "super"
-	}
+	return ""
 }
 
 func FfmpegSetLogLevel(level int) {

From 14374dfade45b0775b54d4a5ebbb8e3464ec9d85 Mon Sep 17 00:00:00 2001
From: Strykar <2946372+Strykar@users.noreply.github.com>
Date: Tue, 12 May 2026 09:39:16 +0530
Subject: [PATCH 2/2] install_ffmpeg.sh: drop libnpp, allow nvcc gencode
 override

scale_cuda replaces scale_npp. CUDA 13 dropped compute_60; default
preserved for CUDA 11/12, override via env for newer SDKs.
---
 install_ffmpeg.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/install_ffmpeg.sh b/install_ffmpeg.sh
index 55108ab75c..595bb4f4a8 100755
--- a/install_ffmpeg.sh
+++ b/install_ffmpeg.sh
@@ -197,7 +197,9 @@ elif [[ "$GOOS" == "windows" ]]; then
   EXTRA_FFMPEG_FLAGS="$EXTRA_FFMPEG_FLAGS --enable-cuda --enable-cuda-llvm --enable-cuvid --enable-nvenc --enable-decoder=h264_cuvid,hevc_cuvid,vp8_cuvid,vp9_cuvid --enable-filter=scale_cuda,signature_cuda,hwupload_cuda --enable-encoder=h264_nvenc,hevc_nvenc"
 elif [[ -e "/usr/local/cuda/lib64" ]]; then
   echo "CUDA SDK detected, building with GPU support"
-  EXTRA_FFMPEG_FLAGS="$EXTRA_FFMPEG_FLAGS --enable-nonfree --enable-cuda-nvcc --enable-libnpp --enable-cuda --enable-cuda-llvm --enable-cuvid --enable-nvenc --enable-decoder=h264_cuvid,hevc_cuvid,vp8_cuvid,vp9_cuvid --enable-filter=scale_npp,signature_cuda,hwupload_cuda --enable-encoder=h264_nvenc,hevc_nvenc"
+  # libnpp is restructured/dropped in CUDA 13 and is otherwise nonfree;
+  # scale_cuda replaces scale_npp without needing it.
+  EXTRA_FFMPEG_FLAGS="$EXTRA_FFMPEG_FLAGS --enable-nonfree --enable-cuda-nvcc --enable-cuda --enable-cuda-llvm --enable-cuvid --enable-nvenc --enable-decoder=h264_cuvid,hevc_cuvid,vp8_cuvid,vp9_cuvid --enable-filter=scale_cuda,signature_cuda,hwupload_cuda --enable-encoder=h264_nvenc,hevc_nvenc"
 else
   echo "No CUDA SDK detected, building without GPU support"
 fi
@@ -231,6 +233,7 @@ if [[ ! -e "$ROOT/ffmpeg/libavcodec/libavcodec.a" ]]; then
     --extra-cflags="${EXTRA_CFLAGS} -I${ROOT}/compiled/include -I/usr/local/cuda/include" \
     --extra-ldflags="${EXTRA_FFMPEG_LDFLAGS} -L${ROOT}/compiled/lib -L/usr/local/cuda/lib64" \
     --prefix="$ROOT/compiled" \
+    --nvccflags="-gencode arch=${NVCC_GENCODE_ARCH:-compute_60},code=${NVCC_GENCODE_SM:-sm_60} -O2 -std=c++11 -m64 -ptx" \
     $EXTRA_FFMPEG_FLAGS \
     $DEV_FFMPEG_FLAGS || (tail -100 ${ROOT}/ffmpeg/ffbuild/config.log && exit 1)
   # If configure fails, then print the last 100 log lines for debugging and exit.