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diff --git a/crates/yt_dlp/src/post_processors/mod.rs b/crates/yt_dlp/src/post_processors/mod.rs
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+// yt - A fully featured command line YouTube client
+//
+// Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+// This file is part of Yt.
+//
+// You should have received a copy of the License along with this program.
+// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
+
+use crate::InfoJson;
+
+pub mod dearrow;
+
+pub trait PostProcessor: std::fmt::Debug + Send {
+    /// Process a [`InfoJson`] object and return the updated one.
+    ///
+    /// # Errors
+    /// If the processing steps failed.
+    fn process(&self, info: InfoJson) -> Result<InfoJson, Error>;
+
+    /// The supported extractors for this post processor
+    fn extractors(&self) -> &'static [&'static str];
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("Failed to access a api: {0}")]
+    Get(#[from] reqwest::Error),
+}