Refactor (See desc)

* Create `FFmpegPostProcessor.real_run_ffmpeg` that can accept multiple input/output files along with switches for each
* Rewrite `cli_configuration_args` and related functions
* Create `YoutubeDL._ensure_dir_exists` - this was previously defined in multiple places

1 files changed, 10 insertions, 2 deletions

diff --git a/yt_dlp/postprocessor/common.py b/yt_dlp/postprocessor/common.py
index f8f4e7693..3c316b349 100644
--- a/yt_dlp/postprocessor/common.py
+++ b/yt_dlp/postprocessor/common.py
@@ -91,10 +91,18 @@ class PostProcessor(object):
         except Exception:
             self.report_warning(errnote)
 
-    def _configuration_args(self, *args, **kwargs):
+    def _configuration_args(self, exe, keys=None, default=[], use_compat=True):
+        pp_key = self.pp_key().lower()
+        exe = exe.lower()
+        root_key = exe if pp_key == exe else '%s+%s' % (pp_key, exe)
+        keys = ['%s%s' % (root_key, k) for k in (keys or [''])]
+        if root_key in keys:
+            keys += [root_key] + ([] if pp_key == exe else [(self.pp_key(), exe)]) + ['default']
+        else:
+            use_compat = False
         return cli_configuration_args(
             self._downloader.params.get('postprocessor_args'),
-            self.pp_key().lower(), *args, **kwargs)
+            keys, default, use_compat)
 
 
 class AudioConversionError(PostProcessingError):