From 9ad38b5b4c530d5f9738afb0e0bc6e093b131660 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Neumann?= <necoro@necoro.eu>
Date: Tue, 10 Feb 2026 10:17:02 +0100
Subject: [PATCH] ffmpeg: Add a -bare variant

Some packages, like unpaper, need a very basic ffmpeg installation
without any external codec dependencies, because they do nothing more than
pixel / picture manipulation.
---
 pkgs/development/libraries/ffmpeg/default.nix |  2 ++
 pkgs/development/libraries/ffmpeg/generic.nix | 19 +++++++++++++------
 pkgs/top-level/all-packages.nix               |  2 ++
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/pkgs/development/libraries/ffmpeg/default.nix b/pkgs/development/libraries/ffmpeg/default.nix
index 0e82e63014c1..1e29fa97f2ec 100644
--- a/pkgs/development/libraries/ffmpeg/default.nix
+++ b/pkgs/development/libraries/ffmpeg/default.nix
@@ -54,6 +54,7 @@ rec {
   ffmpeg_8 = mkFFmpeg v8 "small";
   ffmpeg_8-headless = mkFFmpeg v8 "headless";
   ffmpeg_8-full = mkFFmpeg v8 "full";
+  ffmpeg_8-bare = mkFFmpeg v8 "bare";
 
   # Please make sure this is updated to new major versions once they
   # build and work on all the major platforms. If absolutely necessary
@@ -68,4 +69,5 @@ rec {
   ffmpeg = ffmpeg_8;
   ffmpeg-headless = ffmpeg_8-headless;
   ffmpeg-full = ffmpeg_8-full;
+  ffmpeg-bare = ffmpeg_8-bare;
 }
diff --git a/pkgs/development/libraries/ffmpeg/generic.nix b/pkgs/development/libraries/ffmpeg/generic.nix
index 203052505e5e..fc1f2277be08 100644
--- a/pkgs/development/libraries/ffmpeg/generic.nix
+++ b/pkgs/development/libraries/ffmpeg/generic.nix
@@ -22,6 +22,11 @@
 
   ffmpegVariant ? "small", # Decides which dependencies are enabled by default
 
+  # Build nothing by default. Enable all features that are needed.
+  # To be used for purposes that don't require external dependencies, like `unpaper`
+  # that uses ffmpeg for image processing.
+  withBareDeps ? ffmpegVariant == "bare" || withHeadlessDeps,
+
   # Build with headless deps; excludes dependencies that are only necessary for
   # GUI applications. To be used for purposes that don't generally need such
   # components and i.e. only depend on libav
@@ -52,7 +57,7 @@
   withAvisynth ? withFullDeps, # AviSynth script files reading
   withBluray ? withHeadlessDeps, # BluRay reading
   withBs2b ? withFullDeps, # bs2b DSP library
-  withBzlib ? withHeadlessDeps,
+  withBzlib ? withBareDeps,
   withCaca ? withFullDeps, # Textual display (ASCII art)
   withCdio ? withFullDeps && withGPL, # Audio CD grabbing
   withCelt ? withFullDeps, # CELT decoder
@@ -169,7 +174,7 @@
   withXml2 ? withHeadlessDeps, # libxml2 support, for IMF and DASH demuxers
   withXvid ? withHeadlessDeps && withGPL, # Xvid encoder, native encoder exists
   withZimg ? withHeadlessDeps,
-  withZlib ? withHeadlessDeps,
+  withZlib ? withBareDeps,
   withZmq ? withFullDeps, # Message passing
   withZvbi ? withHeadlessDeps, # Teletext support
 
@@ -201,14 +206,14 @@
   buildQtFaststart ? withFullDeps, # Build qt-faststart executable
   withBin ? buildFfmpeg || buildFfplay || buildFfprobe || buildQtFaststart,
   # Library options
-  buildAvcodec ? withHeadlessDeps, # Build avcodec library
+  buildAvcodec ? withBareDeps, # Build avcodec library
   buildAvdevice ? withHeadlessDeps, # Build avdevice library
   buildAvfilter ? withHeadlessDeps, # Build avfilter library
-  buildAvformat ? withHeadlessDeps, # Build avformat library
+  buildAvformat ? withBareDeps, # Build avformat library
   # Deprecated but depended upon by some packages.
   # https://github.com/NixOS/nixpkgs/pull/211834#issuecomment-1417435991)
   buildAvresample ? withHeadlessDeps && lib.versionOlder version "5", # Build avresample library
-  buildAvutil ? withHeadlessDeps, # Build avutil library
+  buildAvutil ? withBareDeps, # Build avutil library
   # Libpostproc is only available on versions lower than 8.0
   # https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/8c920c4c396163e3b9a0b428dd550d3c986236aa
   buildPostproc ? withHeadlessDeps && lib.versionOlder version "8.0", # Build postproc library
@@ -394,6 +399,7 @@ let
 in
 
 assert lib.elem ffmpegVariant [
+  "bare"
   "headless"
   "small"
   "full"
@@ -992,7 +998,8 @@ stdenv.mkDerivation (
     };
 
     # tests linking broken with shaderc after https://github.com/NixOS/nixpkgs/pull/477464/changes/5a47b12dfcd1b909ba35778a866394430054319a
-    doCheck = stdenv.buildPlatform.canExecute stdenv.hostPlatform && !withShaderc;
+    # tests need at least the headless deps to compile
+    doCheck = stdenv.buildPlatform.canExecute stdenv.hostPlatform && !withShaderc && withHeadlessDeps;
 
     # Fails with SIGABRT otherwise FIXME: Why?
     checkPhase =
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6155a0f10347..883bbc7d384b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6405,9 +6405,11 @@ with pkgs;
     ffmpeg_8
     ffmpeg_8-headless
     ffmpeg_8-full
+    ffmpeg_8-bare
     ffmpeg
     ffmpeg-headless
     ffmpeg-full
+    ffmpeg-bare
     ;
 
   fftwSinglePrec = fftw.override { precision = "single"; };