Try making build reproducible

README.rst

@@ -26,7 +26,7 @@ Currently FFmpeg 8.1 is built with the following packages enabled for all platfo
 - openh264 2.6.0
 - opencore-amr 0.1.6
 - x264 32c3b801191522961102d4bea292cdb61068d0dd
-- x265 4.1
+- x265 4.2
 
 The following additional packages are also enabled on Linux:
 

scripts/build-ffmpeg.py

@@ -1,12 +1,14 @@
 import argparse
 import concurrent.futures
 import glob
+import gzip
 import hashlib
 import os
 import platform
 import shutil
 import subprocess
 import sys
+import tarfile
 
 from cibuildpkg import Builder, Package, fetch, log_group, run
 
@@ -148,8 +150,8 @@ def calculate_sha256(filename: str) -> str:
     ),
     Package(
         name="x265",
-        source_url="https://bitbucket.org/multicoreware/x265_git/downloads/x265_4.1.tar.gz",
-        sha256="a31699c6a89806b74b0151e5e6a7df65de4b49050482fe5ebf8a4379d7af8f29",
+        source_url="https://bitbucket.org/multicoreware/x265_git/downloads/x265_4.2.tar.gz",
+        sha256="40b1ea0453e0309f0eba934e0ddf533f8f6295966679e8894e8f1c1c8d5e1210",
         build_system="cmake",
         source_dir="source",
     ),
@@ -484,9 +486,30 @@ def main():
     else:
         run(["strip", "-s"] + libraries)
 
-    # build output tarball
+    # build output tarball (reproducible: fixed timestamps, sorted entries)
     os.makedirs(output_dir, exist_ok=True)
-    run(["tar", "czvf", output_tarball, "-C", dest_dir, "bin", "include", "lib"])
+    with gzip.GzipFile(output_tarball, "wb", mtime=0) as gz:
+        with tarfile.open(fileobj=gz, mode="w|") as tar:
+            for subdir in ("bin", "include", "lib"):
+                subdir_path = os.path.join(dest_dir, subdir)
+                if not os.path.exists(subdir_path):
+                    continue
+                for root, dirs, files in os.walk(subdir_path):
+                    dirs.sort()
+                    for name in sorted(files):
+                        filepath = os.path.join(root, name)
+                        arcname = os.path.relpath(filepath, dest_dir)
+                        info = tar.gettarinfo(filepath, arcname=arcname)
+                        info.mtime = 0
+                        info.uid = 0
+                        info.gid = 0
+                        info.uname = ""
+                        info.gname = ""
+                        if info.issym() or info.islnk():
+                            tar.addfile(info)
+                        else:
+                            with open(filepath, "rb") as f:
+                                tar.addfile(info, f)
 
 
 if __name__ == "__main__":