updated installer script

MPV/LUA/main.lua

@@ -804,6 +804,7 @@ local _store_status_hint_for_url
 local _refresh_current_store_url_status
 local _skip_next_store_check_url = ''
 local _pick_folder_windows
+M._ytdl_download_format_fallbacks = M._ytdl_download_format_fallbacks or {}
 
 function M._load_store_choices_direct_async(cb)
     cb = cb or function() end
@@ -2070,6 +2071,10 @@ function M._prepare_ytdl_format_for_web_load(url, reason)
         return false
     end
 
+    if explicit_reload_url ~= '' and first_value and first_value ~= '' then
+        M._ytdl_download_format_fallbacks[explicit_reload_url] = first_value
+    end
+
     pcall(mp.set_property, 'options/ytdl-format', '')
     pcall(mp.set_property, 'file-local-options/ytdl-format', '')
     pcall(mp.set_property, 'ytdl-format', '')
@@ -2078,6 +2083,7 @@ function M._prepare_ytdl_format_for_web_load(url, reason)
             .. ' reason=' .. tostring(reason or 'on-load')
             .. ' url=' .. tostring(url)
             .. ' values=' .. table.concat(active_props, '; ')
+            .. ' fallback_cached=' .. tostring(first_value and first_value ~= '' and 'yes' or 'no')
     )
     return true
 end
@@ -2119,6 +2125,28 @@ local function _normalize_url_for_store_lookup(url)
     return url:lower()
 end
 
+function M._remember_ytdl_download_format(url, fmt)
+    local normalized = _normalize_url_for_store_lookup(url)
+    local value = trim(tostring(fmt or ''))
+    if normalized == '' or value == '' then
+        return false
+    end
+    M._ytdl_download_format_fallbacks[normalized] = value
+    return true
+end
+
+function M._get_remembered_ytdl_download_format(url)
+    local normalized = _normalize_url_for_store_lookup(url)
+    if normalized == '' then
+        return nil
+    end
+    local cached = trim(tostring((M._ytdl_download_format_fallbacks or {})[normalized] or ''))
+    if cached == '' then
+        return nil
+    end
+    return cached
+end
+
 local function _build_store_lookup_needles(url)
     local out = {}
     local seen = {}
@@ -4879,6 +4907,7 @@ local function _current_ytdl_format_string()
     local fmt = trim(tostring(mp.get_property_native('ytdl-format') or ''))
     local suspicious_reason = M._suspicious_ytdl_format_reason(fmt, url, raw)
     if fmt ~= '' and not suspicious_reason then
+        M._remember_ytdl_download_format(url, fmt)
         return fmt
     elseif fmt ~= '' then
         _lua_log('ytdl-format: ignoring suspicious current format source=ytdl-format value=' .. tostring(fmt) .. ' reason=' .. tostring(suspicious_reason))
@@ -4888,6 +4917,7 @@ local function _current_ytdl_format_string()
     local opt = trim(tostring(mp.get_property('options/ytdl-format') or ''))
     suspicious_reason = M._suspicious_ytdl_format_reason(opt, url, raw)
     if opt ~= '' and not suspicious_reason then
+        M._remember_ytdl_download_format(url, opt)
         return opt
     elseif opt ~= '' then
         _lua_log('ytdl-format: ignoring suspicious current format source=options/ytdl-format value=' .. tostring(opt) .. ' reason=' .. tostring(suspicious_reason))
@@ -4898,6 +4928,7 @@ local function _current_ytdl_format_string()
             local raw_format_id = tostring(raw.format_id)
             suspicious_reason = M._suspicious_ytdl_format_reason(raw_format_id, url, raw)
             if not suspicious_reason then
+                M._remember_ytdl_download_format(url, raw_format_id)
                 return raw_format_id
             end
             _lua_log('ytdl-format: ignoring suspicious current format source=ytdl-raw-info.format_id value=' .. tostring(raw_format_id) .. ' reason=' .. tostring(suspicious_reason))
@@ -4914,6 +4945,7 @@ local function _current_ytdl_format_string()
                 local joined = table.concat(parts, '+')
                 suspicious_reason = M._suspicious_ytdl_format_reason(joined, url, raw)
                 if not suspicious_reason then
+                    M._remember_ytdl_download_format(url, joined)
                     return joined
                 end
                 _lua_log('ytdl-format: ignoring suspicious current format source=ytdl-raw-info.requested_formats value=' .. tostring(joined) .. ' reason=' .. tostring(suspicious_reason))
@@ -4921,6 +4953,17 @@ local function _current_ytdl_format_string()
         end
     end
 
+    if url ~= '' and _is_ytdlp_url(url) then
+        local remembered = M._get_remembered_ytdl_download_format(url)
+        suspicious_reason = M._suspicious_ytdl_format_reason(remembered, url, raw)
+        if remembered and not suspicious_reason then
+            _lua_log('ytdl-format: using remembered download fallback value=' .. tostring(remembered) .. ' url=' .. tostring(url))
+            return remembered
+        elseif remembered then
+            _lua_log('ytdl-format: ignoring suspicious remembered fallback value=' .. tostring(remembered) .. ' reason=' .. tostring(suspicious_reason))
+        end
+    end
+
     return nil
 end
 
@@ -5200,6 +5243,7 @@ local function _apply_ytdl_format_and_reload(url, fmt)
     _lua_log('change-format: setting ytdl format=' .. tostring(fmt))
     _skip_next_store_check_url = _normalize_url_for_store_lookup(url)
     _set_current_web_url(url)
+    M._remember_ytdl_download_format(url, fmt)
     pcall(mp.set_property, 'options/ytdl-format', tostring(fmt))
     pcall(mp.set_property, 'file-local-options/ytdl-format', tostring(fmt))
     pcall(mp.set_property, 'ytdl-format', tostring(fmt))