diff --git a/twitchdl/commands/download.py b/twitchdl/commands/download.py
index 1fc5dc3..877fcaa 100644
--- a/twitchdl/commands/download.py
+++ b/twitchdl/commands/download.py
@@ -1,6 +1,5 @@
 import asyncio
 import platform
-import click
 import httpx
 import m3u8
 import os
@@ -16,7 +15,7 @@ from urllib.parse import urlparse, urlencode
 
 from twitchdl import twitch, utils
 from twitchdl.download import download_file
-from twitchdl.entities import DownloadOptions
+from twitchdl.entities import Data, DownloadOptions
 from twitchdl.exceptions import ConsoleError
 from twitchdl.http import download_all
 from twitchdl.output import print_out
@@ -115,16 +114,16 @@ def _concat_vods(vod_paths: list[str], target: str):
             raise ConsoleError(f"Joining files failed: {result.stderr}")
 
 
-def _video_target_filename(video, args: DownloadOptions):
+def get_video_substitutions(video: Data, format: str) -> Data:
     date, time = video['publishedAt'].split("T")
     game = video["game"]["name"] if video["game"] else "Unknown"
 
-    subs = {
+    return {
         "channel": video["creator"]["displayName"],
         "channel_login": video["creator"]["login"],
         "date": date,
         "datetime": video["publishedAt"],
-        "format": args.format,
+        "format": format,
         "game": game,
         "game_slug": utils.slugify(game),
         "id": video["id"],
@@ -133,6 +132,10 @@ def _video_target_filename(video, args: DownloadOptions):
         "title_slug": utils.slugify(video["title"]),
     }
 
+
+def _video_target_filename(video: Data, args: DownloadOptions):
+    subs = get_video_substitutions(video, args.format)
+
     try:
         return args.output.format(**subs)
     except KeyError as e:
diff --git a/twitchdl/commands/info.py b/twitchdl/commands/info.py
index 914567e..cf0bb64 100644
--- a/twitchdl/commands/info.py
+++ b/twitchdl/commands/info.py
@@ -1,10 +1,11 @@
 import m3u8
 
 from twitchdl import utils, twitch
+from twitchdl.commands.download import get_video_substitutions
 from twitchdl.exceptions import ConsoleError
 from twitchdl.output import print_video, print_clip, print_json, print_out, print_log
 
-def info(id: str, *, json: bool = False):
+def info(id: str, *, json: bool = False, format="mkv"):
     video_id = utils.parse_video_identifier(id)
     if video_id:
         print_log("Fetching video...")
@@ -22,10 +23,16 @@ def info(id: str, *, json: bool = False):
         print_log("Fetching chapters...")
         chapters = twitch.get_video_chapters(video_id)
 
+        substitutions = get_video_substitutions(video, format)
+
         if json:
             video_json(video, playlists, chapters)
         else:
             video_info(video, playlists, chapters)
+
+            print_out("\nOutput format placeholders:")
+            for k, v in substitutions.items():
+                print(f" * {k} = {v}")
         return
 
     clip_slug = utils.parse_clip_identifier(id)
diff --git a/twitchdl/entities.py b/twitchdl/entities.py
index 83ad080..78c744e 100644
--- a/twitchdl/entities.py
+++ b/twitchdl/entities.py
@@ -1,4 +1,5 @@
 from dataclasses import dataclass
+from typing import Any
 
 
 @dataclass
@@ -17,3 +18,8 @@ class DownloadOptions:
     rate_limit: str | None
     start: int | None
     max_workers: int
+
+
+# Type for annotating decoded JSON
+# TODO: make data classes for common structs
+Data = dict[str, Any]