Not downloading or merging of high quality videos

[xuemio73]

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Checklist

• I'm reporting that yt-dlp is broken on a supported site
• I've verified that I have updated yt-dlp to nightly or master (update instructions)
• I've checked that all provided URLs are playable in a browser with the same IP and same login details
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
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Not downloading or merging of high quality videos.

Running without options will download medium quality videos.
yt-dlp URL -f bestvideo+bestaudio/b
With this option, the highest quality video is downloaded, but the mp4 and webm files are not merged.

Provide verbose output that clearly demonstrates the problem

• Run your yt-dlp command with -vU flag added (yt-dlp -vU <your command line>)
• If using API, add 'verbose': True to YoutubeDL params instead
• Copy the WHOLE output (starting with [debug] Command-line config) and insert it below

Complete Verbose Output

yt-dlp https://www.youtube.com/watch?v=kS6zdUtpS1c  -vU 
[debug] Command-line config: ['https://www.youtube.com/watch?v=kS6zdUtpS1c', '-vU']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version [email protected] from yt-dlp/yt-dlp-nightly-builds [ac817bc83] (pip)
[debug] Python 3.10.4 (CPython x86_64 64bit) - macOS-11.5.2-x86_64-i386-64bit (OpenSSL 1.1.1s  1 Nov 2022)
[debug] exe versions: none
[debug] Optional libraries: Cryptodome-3.20.0, brotli-1.1.0, certifi-2021.05.30, mutagen-1.47.0, requests-2.31.0, sqlite3-3.32.3, urllib3-2.2.1, websockets-12.0
[debug] Proxy map: {}
[debug] Request Handlers: urllib, requests, websockets
[debug] Loaded 1810 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp-nightly-builds/releases/latest
Latest version: [email protected] from yt-dlp/yt-dlp-nightly-builds
yt-dlp is up to date ([email protected] from yt-dlp/yt-dlp-nightly-builds)
[youtube] Extracting URL: https://www.youtube.com/watch?v=kS6zdUtpS1c
[youtube] kS6zdUtpS1c: Downloading webpage
[youtube] kS6zdUtpS1c: Downloading ios player API JSON
[youtube] kS6zdUtpS1c: Downloading android player API JSON
WARNING: [youtube] Skipping player responses from android clients (got player responses for video "aQvGIIdgFDM" instead of "kS6zdUtpS1c")
[debug] Loading youtube-nsig.8fc6998a from cache
[debug] [youtube] Decrypted nsig qfyQl99TAmZV_TbX => _Fm2uvOcRPp5Tw
[debug] Loading youtube-nsig.8fc6998a from cache
[debug] [youtube] Decrypted nsig hga0FI8P1DA4R3xS => yk9BaRD1uQgcvQ
[youtube] kS6zdUtpS1c: Downloading m3u8 information
[debug] Sort order given by extractor: quality, res, fps, hdr:12, source, vcodec:vp9.2, channels, acodec, lang, proto
[debug] Formats sorted by: hasvid, ie_pref, quality, res, fps, hdr:12(7), source, vcodec:vp9.2(10), channels, acodec, lang, proto, size, br, asr, vext, aext, hasaud, id
[debug] Default format spec: best/bestvideo+bestaudio
[info] kS6zdUtpS1c: Downloading 1 format(s): 22
[debug] Invoking http downloader on "https://rr1---sn-cpbavcx-3pme.googlevideo.com/videoplayback?expire=1714671361&ei=oXozZpmpBsyX1d8PxsCx6Ao&ip=2404%3A7a85%3A2241%3A6400%3A4884%3A7d0f%3A6b7f%3A944a&id=o-AJJzaQpnlUDQA8vqgz1QaW1jNm4xN_YMC6NWolbNs-3k&itag=22&source=youtube&requiressl=yes&xpc=EgVo2aDSNQ%3D%3D&mh=6L&mm=31%2C29&mn=sn-cpbavcx-3pme%2Csn-3pm76nee&ms=au%2Crdu&mv=m&mvi=1&pl=33&initcwndbps=1578750&bui=AWRWj2T0hk9QJfMM17xR3a_VElqAwczmYJvIc1YwpKKQRxnhskvBrlEZVwVS-LVeKRIR7h_VzSr4EbkM&spc=UWF9f9D10DsvS1MfY0xr2JC7DU8tWjO_yvHH9iuGbTUYRIblSioVPZ3_5kwr&vprv=1&svpuc=1&mime=video%2Fmp4&ns=qOn8DFzj8qG5sRBFPiOx5p4Q&cnr=14&ratebypass=yes&dur=15.069&lmt=1714200618529349&mt=1714649340&fvip=4&c=WEB&sefc=1&txp=5532434&n=_Fm2uvOcRPp5Tw&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cxpc%2Cbui%2Cspc%2Cvprv%2Csvpuc%2Cmime%2Cns%2Ccnr%2Cratebypass%2Cdur%2Clmt&sig=AJfQdSswRAIgCS32JoudK6WFWwpRWIxH9MZ7j6tSlKh4zB_oZpa2oUICIE3MgJQp1a_eKzcqMojH6VlXIAw2Jm1Wfv_l4nlQM-FR&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AHWaYeowRQIhAJgmv892jrXH0EFwbtSvhvHitpOWsXMLUZRa8SO6WHiCAiBgJQCmmX8dcsgtK9269s5LTEWVnjPhL49F2jYVLf2wzQ%3D%3D"
[download] Destination: 「ウィルキンソン GO」 CM 「午後！刺激！GO！」編 15秒 菅田将暉 [kS6zdUtpS1c].mp4
[download] 100% of    3.08MiB in 00:00:03 at 915.16KiB/s

[seproDev]

You are missing FFmpeg. FFmpeg is required for merging.