diff --git a/av1an-core/src/encoder.rs b/av1an-core/src/encoder.rs
index 11dcfbb9..c1db4912 100644
--- a/av1an-core/src/encoder.rs
+++ b/av1an-core/src/encoder.rs
@@ -439,7 +439,7 @@ impl Encoder {
         "--scenecut", "0",
       ],
       Encoder::x265 => into_vec![
-        "-p", "slow",
+        "--preset", "slow",
         "--crf", "25",
         "-D", "10",
         "--level-idc", "5.0",
diff --git a/av1an-core/src/lib.rs b/av1an-core/src/lib.rs
index 1ec769c5..71e8422d 100644
--- a/av1an-core/src/lib.rs
+++ b/av1an-core/src/lib.rs
@@ -330,7 +330,7 @@ pub enum ChunkOrdering {
 #[must_use]
 pub fn determine_workers(args: &EncodeArgs) -> u64 {
   let res = args.input.resolution().unwrap();
-  let tiles = args.input.calculate_tiles();
+  let tiles = args.tiles;
   let megapixels = (res.0 * res.1) as f64 / 1e6;
   // encoder memory and chunk_method memory usage scales with resolution (megapixels),
   // approximately linearly. Expressed as GB/Megapixel
diff --git a/av1an-core/src/settings.rs b/av1an-core/src/settings.rs
index ceff5c71..87e80d17 100644
--- a/av1an-core/src/settings.rs
+++ b/av1an-core/src/settings.rs
@@ -55,6 +55,7 @@ pub struct EncodeArgs {
 
   pub passes: u8,
   pub video_params: Vec<String>,
+  pub tiles: (u32, u32), // tile (cols, rows) count; log2 will be applied later for specific encoders
   pub encoder: Encoder,
   pub workers: usize,
   pub set_thread_affinity: Option<usize>,
@@ -74,6 +75,7 @@ pub struct EncodeArgs {
   pub resume: bool,
   pub keep: bool,
   pub force: bool,
+  pub tile_auto: bool,
 
   pub concat: ConcatMethod,
   pub target_quality: Option<TargetQuality>,
@@ -171,13 +173,17 @@ properly into a mkv file. Specify mkvmerge as the concatenation method by settin
       );
     }
 
+    if self.tile_auto {
+        self.tiles = self.input.calculate_tiles();
+    }
+
     if !self.force {
       if self.video_params.is_empty() {
-        self.video_params = self.encoder.get_default_arguments(self.input.calculate_tiles());
+        self.video_params = self.encoder.get_default_arguments(self.tiles);
       } else {
         // merge video_params with defaults, overriding defaults
         // TODO: consider using hashmap to store program arguments instead of string vector
-        let default_video_params = self.encoder.get_default_arguments(self.input.calculate_tiles());
+        let default_video_params = self.encoder.get_default_arguments(self.tiles);
         let mut skip = false;
         let mut _default_params: Vec<String> = Vec::new();
         for param in default_video_params {
diff --git a/av1an/src/main.rs b/av1an/src/main.rs
index ce4bb28f..09281b7a 100644
--- a/av1an/src/main.rs
+++ b/av1an/src/main.rs
@@ -295,6 +295,12 @@ pub struct CliOpts {
   #[clap(short, long, value_parser = value_parser!(u8).range(1..=2), help_heading = "Encoding")]
   pub passes: Option<u8>,
 
+  /// Estimate tile count from source
+  ///
+  /// Worker estimation will consider tile count accordingly.
+  #[clap(long, help_heading = "Encoding")]
+  pub tile_auto: bool,
+
   /// Audio encoding parameters (ffmpeg syntax)
   ///
   /// If not specified, "-c:a copy" is used.
@@ -752,6 +758,8 @@ pub fn parse_cli(args: CliOpts) -> anyhow::Result<Vec<EncodeArgs>> {
         Verbosity::Normal
       },
       workers: args.workers,
+      tiles: (1, 1),  // default value; will be adjusted if tile_auto set
+      tile_auto: args.tile_auto,
       set_thread_affinity: args.set_thread_affinity,
       zones: args.zones.clone(),
       scaler: {
diff --git a/site/src/Cli/encoding.md b/site/src/Cli/encoding.md
index f541ca11..a3a35460 100644
--- a/site/src/Cli/encoding.md
+++ b/site/src/Cli/encoding.md
@@ -29,6 +29,9 @@
 
 		[possible values: 1, 2]
 
+--tile-auto
+		Estimate tile count based on resolution, and set encoder parameters, if applicable.
+
 -a, --audio-params <AUDIO_PARAMS>
 		Audio encoding parameters (ffmpeg syntax)