From 5b68c478fb0b93ea6b8fac23f50e12217fa063db Mon Sep 17 00:00:00 2001
From: kclauhk <78251477+kclauhk@users.noreply.github.com>
Date: Mon, 29 Jan 2024 02:39:14 +0800
Subject: [PATCH] [ie/facebook] Set format HTTP chunk size (#9058)

Closes #8197
Authored by: bashonly, kclauhk
---
 yt_dlp/extractor/facebook.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/yt_dlp/extractor/facebook.py b/yt_dlp/extractor/facebook.py
index 26cfda538..84856abe1 100644
--- a/yt_dlp/extractor/facebook.py
+++ b/yt_dlp/extractor/facebook.py
@@ -564,7 +564,11 @@ class FacebookIE(InfoExtractor):
             # Downloads with browser's User-Agent are rate limited. Working around
             # with non-browser User-Agent.
             for f in info['formats']:
+                # Downloads with browser's User-Agent are rate limited. Working around
+                # with non-browser User-Agent.
                 f.setdefault('http_headers', {})['User-Agent'] = 'facebookexternalhit/1.1'
+                # Formats larger than ~500MB will return error 403 unless chunk size is regulated
+                f.setdefault('downloader_options', {})['http_chunk_size'] = 250 << 20
 
         def extract_relay_data(_filter):
             return self._parse_json(self._search_regex(