gnu: yt-dlp: Don't inherit from youtube-dl.

yt-dlp has diverged from youtube-dl sufficiently that package inheritance
hinders package maintenance.

* gnu/packages/video.scm (yt-dlp): Don't inherit from YOUTUBE-DL.
[build-system, synopsis, license]: New fields.
[arguments]: Adjust accordingly.
[inputs]: Add FFMPEG.

Change-Id: I14c4cfb6a75ba0421c62eac778072ab3e76c72a1

gnu/packages/video.scm

@@ -3136,7 +3136,7 @@ YouTube.com and many more sites.")
     (license license:public-domain)))
 
 (define-public yt-dlp
-  (package/inherit youtube-dl
+  (package
     (name "yt-dlp")
     (version "2023.10.13")
     (source
@@ -3148,51 +3148,52 @@ YouTube.com and many more sites.")
        (file-name (git-file-name name version))
        (sha256
         (base32 "1cy8cpqwq6yfsbrnln3qqp9lsjckn20m6w7b890ha7jahyir5m1n"))))
+    (build-system python-build-system)
     (arguments
-     (substitute-keyword-arguments (package-arguments youtube-dl)
-       ((#:tests? _) (not (%current-target-system)))
-       ((#:phases phases)
-        #~(modify-phases #$phases
-            ;; See the comment for the corresponding phase in youtube-dl.
-            (replace 'default-to-the-ffmpeg-input
-              (lambda* (#:key inputs #:allow-other-keys)
-                (substitute* "yt_dlp/postprocessor/ffmpeg.py"
-                  (("location = self.get_param(.*)$")
-                   (string-append
-                     "location = '"
-                     (dirname (search-input-file inputs "bin/ffmpeg"))
-                     "'\n")))))
-            (replace 'build-generated-files
-              (lambda* (#:key inputs #:allow-other-keys)
-                (if (assoc-ref inputs "pandoc")
-                  (invoke "make"
-                          "PYTHON=python"
-                          "yt-dlp"
-                          "yt-dlp.1"
-                          "completions")
-                  (invoke "make"
-                          "PYTHON=python"
-                          "yt-dlp"
-                          "completions"))))
-            (replace 'fix-the-data-directories
-              (lambda* (#:key outputs #:allow-other-keys)
-                (let ((prefix (assoc-ref outputs "out")))
-                  (substitute* "setup.py"
-                    (("'etc/")
-                     (string-append "'" prefix "/etc/"))
-                    (("'share/")
-                     (string-append "'" prefix "/share/"))))))
-            (delete 'install-completion)
-            (replace 'check
-              (lambda* (#:key tests? #:allow-other-keys)
-                (when tests?
-                  (invoke "pytest" "-k" "not download"))))))))
-    (inputs (modify-inputs (package-inputs youtube-dl)
-              (append python-brotli
-                      python-certifi
-                      python-mutagen
-                      python-pycryptodomex
-                      python-websockets)))
+     `(#:tests? ,(not (%current-target-system))
+       #:phases
+       (modify-phases %standard-phases
+         ;; See <https://issues.guix.gnu.org/43418#5>.
+         ;; ffmpeg is big but required to request free formats from, e.g.,
+         ;; YouTube so pull it in unconditionally.  Continue respecting the
+         ;; --ffmpeg-location argument.
+         (add-after 'unpack 'default-to-the-ffmpeg-input
+           (lambda* (#:key inputs #:allow-other-keys)
+             (substitute* "yt_dlp/postprocessor/ffmpeg.py"
+               (("location = self.get_param(.*)$")
+                (string-append
+                  "location = '"
+                  (dirname (search-input-file inputs "bin/ffmpeg"))
+                  "'\n")))))
+         (add-before 'build 'build-generated-files
+           (lambda* (#:key inputs #:allow-other-keys)
+             (if (assoc-ref inputs "pandoc")
+               (invoke "make"
+                       "PYTHON=python"
+                       "yt-dlp"
+                       "yt-dlp.1"
+                       "completions")
+               (invoke "make"
+                       "PYTHON=python"
+                       "yt-dlp"
+                       "completions"))))
+         (add-before 'install 'fix-the-data-directories
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((prefix (assoc-ref outputs "out")))
+               (substitute* "setup.py"
+                 (("'etc/")
+                  (string-append "'" prefix "/etc/"))
+                 (("'share/")
+                  (string-append "'" prefix "/share/"))))))
+         (replace 'check
+           (lambda* (#:key tests? #:allow-other-keys)
+             (when tests?
+               (invoke "pytest" "-k" "not download")))))))
+    (inputs (list ffmpeg python-brotli
+                  python-certifi
+                  python-mutagen
+                  python-pycryptodomex
+                  python-websockets))
     (native-inputs
      (append
        ;; To generate the manpage.
@@ -3200,13 +3201,15 @@ YouTube.com and many more sites.")
          (list pandoc)
          '())
        (list python-pytest zip)))
+    (synopsis "Download videos from YouTube.com and other sites")
     (description
      "yt-dlp is a small command-line program to download videos from
 YouTube.com and many more sites.  It is a fork of youtube-dl with a
 focus on adding new features while keeping up-to-date with the
 original project.")
     (properties '((release-monitoring-url . "https://pypi.org/project/yt-dlp/")))
-    (home-page "https://github.com/yt-dlp/yt-dlp")))
+    (home-page "https://github.com/yt-dlp/yt-dlp")
+    (license license:public-domain)))
 
 (define-public you-get
   (package