gnu: mpv: Patch removed constants from ffmpeg 8.0.

MPV 0.40.0 didn't remove deprecated constants. Those
constants were removed in ffmpeg 8.0. Mpv is not planning
on releasing a patch release any time soon.

* gnu/packages/patches/mpv-0.40.0-fix-ffmpeg-8.0.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/video.scm (mpv)<source>[patches]: Apply it.

Change-Id: Id48bf513e6c80b59ae2bb167e7e98e41d5efad6f
Signed-off-by: John Kehayias <john@guixotic.coop>

gnu/local.mk

@@ -1871,6 +1871,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/mpc123-initialize-ao.patch		\
   %D%/packages/patches/mpg321-CVE-2019-14247.patch		\
   %D%/packages/patches/mpg321-gcc-10.patch			\
+  %D%/packages/patches/mpv-0.40.0-fix-ffmpeg-8.0.patch		\
   %D%/packages/patches/modglue-fix-build.patch		\
   %D%/packages/patches/modem-manager-fix-test-wrapper.patch	\
   %D%/packages/patches/module-init-tools-moduledir.patch	\

gnu/packages/patches/mpv-0.40.0-fix-ffmpeg-8.0.patch

@@ -0,0 +1,40 @@
+Patch obtained from https://github.com/mpv-player/mpv/commit/26b29fba02a2782f68e2906f837d21201fc6f1b9
+See https://github.com/mpv-player/mpv/issues/16176 for discussion. Next version
+of mpv will have this fixed, but upstream is not planning to release a patch
+release.
+
+From 26b29fba02a2782f68e2906f837d21201fc6f1b9 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Kacper=20Michaj=C5=82ow?= <kasper93@gmail.com>
+Date: Fri, 28 Mar 2025 19:12:01 +0100
+Subject: [PATCH] demux_mkv: fix compilation after deprecated definitions
+ removal
+
+See: https://github.com/FFmpeg/FFmpeg/commit/822432769868da325ba03774df1084aa78b9a5a0
+---
+ demux/demux_mkv.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/demux/demux_mkv.c b/demux/demux_mkv.c
+index 135edcc23d82b..cc7ce3e98f4f6 100644
+--- a/demux/demux_mkv.c
++++ b/demux/demux_mkv.c
+@@ -2200,16 +2200,16 @@ static int demux_mkv_open_sub(demuxer_t *demuxer, mkv_track_t *track)
+             // [0x30..0x37] are component tags utilized for
+             // non-mobile captioning service ("profile A").
+             if (component_tag >= 0x30 && component_tag <= 0x37)
+-                lav->profile = FF_PROFILE_ARIB_PROFILE_A;
++                lav->profile = AV_PROFILE_ARIB_PROFILE_A;
+             break;
+         case 0x0012:
+             // component tag 0x87 signifies a mobile/partial reception
+             // (1seg) captioning service ("profile C").
+             if (component_tag == 0x87)
+-                lav->profile = FF_PROFILE_ARIB_PROFILE_C;
++                lav->profile = AV_PROFILE_ARIB_PROFILE_C;
+             break;
+         }
+-        if (lav->profile == FF_PROFILE_UNKNOWN)
++        if (lav->profile == AV_PROFILE_UNKNOWN)
+             MP_WARN(demuxer, "ARIB caption profile %02x / %04x not supported.\n",
+                     component_tag, data_component_id);
+     }

gnu/packages/video.scm

@@ -2700,7 +2700,10 @@ SVCD, DVD, 3ivx, DivX 3/4/5, WMV and H.264 movies.")
                     (commit (string-append "v" version))))
               (file-name (git-file-name name version))
               (sha256
-               (base32 "0w0qk61ll0mddbkiwavqfx048sacyvp6fwglms58ypw869rh7iy7"))))
+               (base32 "0w0qk61ll0mddbkiwavqfx048sacyvp6fwglms58ypw869rh7iy7"))
+              (patches
+               (search-patches
+                "mpv-0.40.0-fix-ffmpeg-8.0.patch"))))
     (build-system meson-build-system)
     (arguments
      (list