Use absolute instead of canonicalize for better Windows path handling

Closes master-of-zen#860

av1an-core/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "av1an-core"
 version = "0.4.1"
-rust-version = "1.70"
+rust-version = "1.79"
 edition = "2021"
 authors = ["Zen <[email protected]>"]
 description = """

av1an-core/src/util.rs

@@ -1,4 +1,7 @@
-use std::path::{Path, PathBuf};
+use std::{
+  io,
+  path::{absolute, Path, PathBuf},
+};
 
 /// Count the number of elements passed to this macro.
 ///
@@ -133,6 +136,15 @@ pub fn read_in_dir(path: &Path) -> anyhow::Result<impl Iterator<Item = PathBuf>>
   }))
 }
 
+#[inline]
+pub(crate) fn to_absolute_path(path: &Path) -> io::Result<PathBuf> {
+  if cfg!(target_os = "windows") {
+    absolute(path)
+  } else {
+    path.canonicalize()
+  }
+}
+
 #[cfg(test)]
 mod tests {
   use std::borrow::Cow;

av1an-core/src/vapoursynth.rs

@@ -10,6 +10,8 @@ use std::process::Command;
 use vapoursynth::prelude::*;
 use vapoursynth::video_info::VideoInfo;
 
+use crate::util::to_absolute_path;
+
 use super::ChunkMethod;
 
 static VAPOURSYNTH_PLUGINS: Lazy<HashSet<String>> = Lazy::new(|| {
@@ -193,7 +195,7 @@ pub fn create_vs_file(
   chunk_method: ChunkMethod,
 ) -> anyhow::Result<PathBuf> {
   let temp: &Path = temp.as_ref();
-  let source = source.canonicalize()?;
+  let source = to_absolute_path(source)?;
 
   let load_script_path = temp.join("split").join("loadscript.vpy");
 
@@ -222,7 +224,7 @@ pub fn create_vs_file(
       .arg(&dgindexnv_output)
       .output()?;
 
-    let dgindex_path = dgindexnv_output.canonicalize()?;
+    let dgindex_path = to_absolute_path(&dgindexnv_output)?;
     load_script.write_all(
       format!(
         "from vapoursynth import core\n\