power_sequencer: update to the latest master

This commit brings Power Sequencer to the current rolling version, that is
commit 9562eb58d164e234f61225250d6ac5ca858ada7b on
https://github.com/GDQuest/blender-power-sequencer/.

I had already made an intermediate commit that added new features and fixed some
bugs. This commit brings bug fixes and many quality of life improvements.

- Human-readable changelog:
  https://github.com/GDQuest/blender-power-sequencer/blob/master/CHANGELOG.md
- 1.4.0 release post:
  https://github.com/GDQuest/blender-power-sequencer/releases/tag/1.4.0
- All the commits since v1.3.0 (previous update + this one in this repository):
  https://github.com/GDQuest/blender-power-sequencer/compare/1.3.0...master

1 files changed, 40 insertions, 0 deletions

diff --git a/power_sequencer/addon_preferences.py b/power_sequencer/addon_preferences.py
index 0e8e7d71..fcc67e9c 100644
--- a/power_sequencer/addon_preferences.py
+++ b/power_sequencer/addon_preferences.py
@@ -17,12 +17,16 @@
 """
 Add-on preferences and interface in the Blender preferences window.
 """
+import subprocess
+
 import bpy
+from bpy.props import BoolProperty, StringProperty
 
 
 def get_preferences(context):
     return context.preferences.addons[__package__].preferences
 
+
 class PowerSequencerPreferences(bpy.types.AddonPreferences):
     bl_idname = __package__
 
@@ -31,6 +35,32 @@ class PowerSequencerPreferences(bpy.types.AddonPreferences):
     proxy_75: bpy.props.BoolProperty(name="75%", default=False)
     proxy_100: bpy.props.BoolProperty(name="100%", default=False)
 
+    # Code adapted from Krzysztof Trzciński's work
+    ffmpeg_executable: StringProperty(
+        name="Path to ffmpeg executable",
+        default="",
+        update=lambda self, context: self.update_ffmpeg_executable(context),
+        subtype="FILE_PATH",
+    )
+    ffmpeg_status: StringProperty(default="")
+    ffmpeg_is_executable_valid: BoolProperty(default=False)
+
+    def update_ffmpeg_executable(self, context):
+        error_message, info = self._try_run_ffmpeg(self.ffmpeg_executable)
+        self.ffmpeg_is_executable_valid = error_message == ""
+        self.ffmpeg_status = error_message if error_message != "" else info
+
+    def _try_run_ffmpeg(self, path):
+        """Runs ffmpeg -version, and returns an error message if it failed"""
+        error_message, info = "", ""
+        try:
+            info: str = subprocess.check_output([path, "-version"]).decode("utf-8")
+            info = info[:info.find("Copyright")]
+            print(info)
+        except (OSError, subprocess.CalledProcessError):
+            error_message = "Path `{}` is not a valid ffmpeg executable".format(path)
+        return error_message, info
+
     def draw(self, context):
         layout = self.layout
 
@@ -42,6 +72,16 @@ class PowerSequencerPreferences(bpy.types.AddonPreferences):
         row.prop(self, "proxy_75")
         row.prop(self, "proxy_100")
 
+        text = [
+            "(Optional) FFMpeg executable to use for multithread renders and proxy generation. "
+            "Use this to render with a version of ffmpeg that's not on your system's PATH variable."
+        ]
+        for line in text:
+            layout.label(text=line)
+        layout.prop(self, "ffmpeg_executable")
+        icon = "INFO" if self.ffmpeg_is_executable_valid else "ERROR"
+        layout.label(text=self.ffmpeg_status, icon=icon)
+
 
 register_preferences, unregister_preferences = bpy.utils.register_classes_factory(
     [PowerSequencerPreferences]