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I'll join the topic too (XP ffmpeg Pentium 4): http://blog.k-tai-douga.com/

After installing v3.9.16 via this link and checking for updates through the app, I get a Updates available but for v3.9.15.

For some reason the StartAllBack website states the latest version is still 3.9.15, but this installer is in fact for 3.9.16. Also, the latest version isn't coming down via checking for updates through the app.

https://startisback.com/StartAllBack_setup.exe

It works. (also on Vista ) [debug] Command-line config: ['-v'] [debug] Encodings: locale cp1252, fs utf-8, pref cp1252, out cp1252 (No VT), error cp1252 (No VT), screen cp1252 (No VT) [debug] yt-dlp version nicolaasjan/yt-dlp@2025.09.27.071342 (winXP_x86_exe*) [debug] Python 3.11.4 (CPython x86 32bit) - Windows-XP-5.1.2600-SP3 (OpenSSL 3.5.2 5 Aug 2025) [debug] exe versions: ffmpeg N-121254-g635cb4543f (fdk,setts), ffprobe N-121254-g635cb4543f, phantomjs 1.9.8 [debug] Optional libraries: Cryptodome-3.23.0, brotli-1.1.0, certifi-2025.08.03, mutagen-1.47.0, requests-2.32.5, sqlite3-3.50.4, urllib3-2.5.0, websockets-15.0.1 [debug] Proxy map: {} [debug] Request Handlers: urllib, requests, websockets [debug] Plugin directories: none [debug] Loaded 1833 extractors Are you planning to update it once in a while?

Well, our "friends" over at Google have been, again, working hard ; like @j7n had reported in the recent past, they are now pushing, in my part of the globe, too, their SABR-protocol formats even for the tv yt_client; with the latest yt-dlp_x86.exe version, the special "Vista" variant, I can now only get format 18 (360p) for the TV client, plus the WEB-S and IOS (thanks, again, nicolaasjan ) formats: yt-dlp -vF "yrcIdXBwVww" [debug] Command-line config: ['--ffmpeg-location', '..\\FFmpeg', '--downloader-args', 'ffmpeg:-v 8 -stats', '-vF', 'yrcIdXBwVww'] [debug] Encodings: locale cp1253, fs utf-8, pref cp1253, out utf-8 (No VT), error utf-8 (No VT), screen utf-8 (No VT) [debug] yt-dlp version local@2025.09.27 [88e2a2de8] (win_x86_exe) [debug] Python 3.13.7 (CPython x86 32bit) - Windows-Vista-6.0.6003-SP2 (OpenSSL 3.0.16 11 Feb 2025) [debug] exe versions: ffmpeg n6.1-dev-2615-N-112499-ga76b409 (setts), ffprobe n6.1-dev-2615-N-112499-ga76b409, phantomjs 2.1.1, rtmpdump 2.4 [debug] Optional libraries: Cryptodome-3.23.0, brotli-1.1.0, certifi-2025.08.03, mutagen-1.47.0, requests-2.32.5, sqlite3-3.50.4, urllib3-2.5.0, websockets-15.0.1 [debug] Proxy map: {} [debug] Request Handlers: urllib, requests, websockets [debug] Plugin directories: none [debug] Loaded 1833 extractors [debug] [youtube] [pot] PO Token Providers: none [debug] [youtube] [pot] PO Token Cache Providers: memory [debug] [youtube] [pot] PO Token Cache Spec Providers: webpo [youtube] Extracting URL: yrcIdXBwVww [youtube] yrcIdXBwVww: Downloading webpage [youtube] yrcIdXBwVww: Downloading tv client config [debug] [youtube] Forcing player 0004de42 in place of player da13af8d original url = /s/player/da13af8d/player_ias.vflset/en_US/base.js [youtube] yrcIdXBwVww: Downloading tv player API JSON [youtube] yrcIdXBwVww: Downloading web safari player API JSON [youtube] yrcIdXBwVww: Downloading ios player API JSON [debug] Loading youtube-nsig.0004de42-main from cache [debug] [youtube] Decrypted nsig V6BpqA2btXTozIh => 30NYUH_c5XH0Ag WARNING: [youtube] yrcIdXBwVww: Some tv client https formats have been skipped as they are missing a url. YouTube may have enabled the SABR-only or Server-Side Ad Placement experiment for the current session. See https://github.com/yt-dlp/yt-dlp/issues/12482 for more details WARNING: [youtube] yrcIdXBwVww: Some web_safari client https formats have been skipped as they are missing a url. YouTube is forcing SABR streaming for this client. See https://github.com/yt-dlp/yt-dlp/issues/12482 for more details [debug] [youtube] yrcIdXBwVww: ios client https formats require a GVS PO Token which was not provided. They will be skipped as they may yield HTTP Error 403. You can manually pass a GVS PO Token for this client with --extractor-args "youtube:po_token=ios.gvs+XXX". For more information, refer to https://github.com/yt-dlp/yt-dlp/wiki/PO-Token-Guide . To enable these broken formats anyway, pass --extractor-args "youtube:formats=missing_pot" WARNING: [youtube] yrcIdXBwVww: Some web client https formats have been skipped as they are missing a url. YouTube is forcing SABR streaming for this client. See https://github.com/yt-dlp/yt-dlp/issues/12482 for more details [youtube] yrcIdXBwVww: Downloading m3u8 information [youtube] yrcIdXBwVww: Downloading m3u8 information [debug] Sort order given by extractor: quality, res, fps, hdr:12, source, vcodec, channels, acodec, lang, proto [debug] Formats sorted by: hasvid, ie_pref, quality, res, fps, hdr:12(7), source, vcodec, channels, acodec, lang, proto, size, br, asr, vext, aext, hasaud, id [info] Available formats for yrcIdXBwVww: ID EXT RESOLUTION FPS CH | FILESIZE TBR PROTO | VCODEC VBR ACODEC ASR MORE INFO ---------------------------------------------------------------------------------------------------------------------- sb3 mhtml 48x27 0 | mhtml | images storyboard sb2 mhtml 80x45 1 | mhtml | images storyboard sb1 mhtml 160x90 1 | mhtml | images storyboard sb0 mhtml 320x180 1 | mhtml | images storyboard 233 mp4 audio only | m3u8 | audio only unknown Untested, Default, low, IOS 234 mp4 audio only | m3u8 | audio only unknown Untested, Default, high, IOS 91 mp4 256x144 30 | ~ 3.43MiB 123k m3u8 | avc1.4D400C mp4a.40.5 WEB-S 269 mp4 256x144 30 | ~ 3.43MiB 123k m3u8 | avc1.4D400C 123k video only Untested, IOS 603 mp4 256x144 30 | ~ 2.93MiB 106k m3u8 | vp09.00.11.08 106k video only Untested, IOS 92 mp4 426x240 30 | ~ 5.41MiB 195k m3u8 | avc1.4D4015 mp4a.40.5 WEB-S 229 mp4 426x240 30 | ~ 5.41MiB 195k m3u8 | avc1.4D4015 195k video only Untested, IOS 604 mp4 426x240 30 | ~ 4.04MiB 145k m3u8 | vp09.00.20.08 145k video only Untested, IOS 93 mp4 640x360 30 | ~ 11.03MiB 397k m3u8 | avc1.4D401E mp4a.40.2 WEB-S 230 mp4 640x360 30 | ~ 11.03MiB 397k m3u8 | avc1.4D401E 397k video only Untested, IOS 18 mp4 640x360 30 2 | 4.15MiB 149k https | avc1.42001E mp4a.40.2 22k 360p, TV 605 mp4 640x360 30 | ~ 9.08MiB 327k m3u8 | vp09.00.21.08 327k video only Untested, IOS 94 mp4 854x480 30 | ~ 20.21MiB 728k m3u8 | avc1.4D401F mp4a.40.2 WEB-S 231 mp4 854x480 30 | ~ 20.21MiB 728k m3u8 | avc1.4D401F 728k video only Untested, IOS 606 mp4 854x480 30 | ~ 13.77MiB 496k m3u8 | vp09.00.30.08 496k video only Untested, IOS 95 mp4 1280x720 30 | ~ 41.07MiB 1479k m3u8 | avc1.64001F mp4a.40.2 WEB-S 232 mp4 1280x720 30 | ~ 41.07MiB 1479k m3u8 | avc1.64001F 1479k video only Untested, IOS 609 mp4 1280x720 30 | ~ 26.75MiB 963k m3u8 | vp09.00.31.08 963k video only Untested, IOS 96 mp4 1920x1080 30 | ~ 81.20MiB 2923k m3u8 | avc1.640028 mp4a.40.2 WEB-S 270 mp4 1920x1080 30 | ~ 81.20MiB 2923k m3u8 | avc1.640028 2923k video only Untested, IOS 614 mp4 1920x1080 30 | ~ 46.56MiB 1676k m3u8 | vp09.00.40.08 1676k video only Untested, IOS 620 mp4 2560x1440 30 | ~131.06MiB 4718k m3u8 | vp09.00.50.08 4718k video only Untested, IOS This is, hopefully, an A/B test at the moment, so invoking yt-dlp with the same command multiple times may finally get one the sought-after ABR formats (DASH) for the (default) TV yt_client ...

Confirmed. Thanks.

You can add ::MTRR 5 - Unused msr_set.exe 20B 00000000 00000000 msr_set.exe 20A 00000000 00000000 It will work without this but for clean result. Yes, of course. AMD64 Architecture Programmer's Manual. MTRR (Memory Type Range Registers) description particulary. You should just be a jentleman and don't stop conversation if YOU asked for. Rename this thread to reflect the REAL problem you have, give other people chance to solve the same problems.

Thank you @nicolaasjan for your yt-dlp builds. I have made a Windows XP compatible build of FFmpeg that targets a Pentium 4. I relied heavily on rdp and @Reino build scripts so thanks also to them. ffmpeg-8.1-630-635cb4543f-win32-static-xpmod-P4.7z libfdk-aac-2.0.3-158-d8e6b1a-win32-xpmod-P4.7z

Most notorious telemetry updates for Win 7 and their descriptions: KB4493132-x86-x64 (End of support notification for Windows 7) KB4524752-x86-x64 (End of support notification for Windows 7 Pro) KB971033-x86-x64 (Update for Windows activation verification technologies) KB2952664-x86-x64 (System compatibility update for transition to Windows 10) KB2977759-x86-x64 (Diagnostics for compatibility issues for transition to Windows 10) KB3021917-x86-x64 (System diagnostics and telemetry for transition to Windows 10) KB3035583-x86-x64 (Update installs the ‘Get Windows 10’ app) KB3068708-x86-x64 (Update to improve quality and telemetry diagnostics) KB3075249-x86-x64 (Update adds telemetry points to the consent.exe file) KB3080149-x86-x64 (Update for CEIP and telemetry diagnostics) KB3081954-x86-x64 (Update to improve working folders and telemetry) KB3123862-x86-x64 (Updated capabilities for upgrading to Windows 10) KB3139923-x86-x64 (Update adds telemetry points to consent.exe file) KB3150513-x86-x64 (Updated configurations for compatibility diagnostics) KB3161608-x86-x64 (Update adds telemetry points to consent.exe file) KB3163589-x86-x64 (Message about running an outdated version of Windows) KB3172605-x86-x64 (Update adds telemetry points to consent.exe) KB3173040-x86-x64 (Notification about the expiration of the Windows 10 upgrade offer) KB3125574-v4 (also inludes unnamed telemetry)