persepolis: fix error when opening video finder

The video finder is still broken on youtube, but that's an upstream
issue that we might not want to fix ourselves, see
https://github.com/persepolisdm/persepolis/issues/930

pkgs/tools/networking/persepolis/0004-Search-PATH-for-ffmpeg-on-darwin.patch

@@ -0,0 +1,34 @@
+---
+ persepolis/scripts/mainwindow.py   | 2 +-
+ persepolis/scripts/useful_tools.py | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/persepolis/scripts/mainwindow.py b/persepolis/scripts/mainwindow.py
+index d21f3f4..a0e3674 100644
+--- a/persepolis/scripts/mainwindow.py
++++ b/persepolis/scripts/mainwindow.py
+@@ -161,7 +161,7 @@ class CheckVersionsThread(QThread):
+ 
+             else:
+                 pipe = subprocess.Popen(
+-                    [ffmpeg_path, '-version'],
++                    ['ffmpeg', '-version'],
+                     stdout=subprocess.PIPE,
+                     stdin=subprocess.PIPE,
+                     stderr=subprocess.PIPE,
+diff --git a/persepolis/scripts/useful_tools.py b/persepolis/scripts/useful_tools.py
+index b780967..31733eb 100644
+--- a/persepolis/scripts/useful_tools.py
++++ b/persepolis/scripts/useful_tools.py
+@@ -342,7 +342,7 @@ def muxer(parent, video_finder_dictionary):
+                 current_directory = os.path.dirname(cwd)
+                 ffmpeg_path = os.path.join(current_directory, 'ffmpeg')
+ 
+-                pipe = subprocess.Popen([ffmpeg_path, '-i', video_file_path,
++                pipe = subprocess.Popen(['ffmpeg', '-i', video_file_path,
+                                          '-i', audio_file_path,
+                                          '-c', 'copy',
+                                          '-shortest',
+-- 
+2.39.3 (Apple Git-145)
+

pkgs/tools/networking/persepolis/default.nix

@@ -3,6 +3,7 @@
 , buildPythonApplication
 , fetchFromGitHub
 , aria
+, ffmpeg
 , libnotify
 , pulseaudio
 , psutil
@@ -37,6 +38,7 @@ buildPythonApplication rec {
     ./0001-Allow-building-on-darwin.patch
     ./0002-Fix-startup-crash-on-darwin.patch
     ./0003-Search-PATH-for-aria2c-on-darwin.patch
+    ./0004-Search-PATH-for-ffmpeg-on-darwin.patch
   ];
 
   postPatch = ''
@@ -55,7 +57,7 @@ buildPythonApplication rec {
 
   # feed args to wrapPythonApp
   makeWrapperArgs = [
-    "--prefix PATH : ${lib.makeBinPath [ aria libnotify ]}"
+    "--prefix PATH : ${lib.makeBinPath [ aria ffmpeg libnotify ]}"
     "\${qtWrapperArgs[@]}"
   ];