youtube-dl extremely high fragmentation (dashsegments)

Checklist

• I’m reporting a broken site support issue
• [x ] I’ve verified that I’m running youtube-dl version 2021.02.10
• [x ] I’ve checked that all provided URLs are alive and playable in a browser
• [x ] I’ve checked that all URLs and arguments with special characters are properly quoted or escaped
• [x ] I’ve searched the bugtracker for similar bug reports including closed ones
• [x ] I’ve read bugs section in FAQ

Verbose log

$ youtube-dl -vv -k -i -f bestvideo+bestaudio --external-downloader aria2c --external-downloader-args "-s 16 -j 16 -x 16 -k 20M" uWPIsaYpY7U
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-vv', '-k', '-i', '-f', 'bestvideo+bestaudio', '--external-downloader', 'aria2c', '--external-downloader-args', '-s 16 -j 16 -x 16 -k 20M', 'uWPIsaYpY7U']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.02.10
[debug] Python version 3.8.6 (CPython) - Linux-5.11.0-051100rc7-lowlatency-x86_64-with-glibc2.32
[debug] exe versions: ffmpeg 4.3.1, ffprobe 4.3.1
[debug] Proxy map: {}
[youtube] uWPIsaYpY7U: Downloading webpage
[youtube] uWPIsaYpY7U: Downloading MPD manifest
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on 'https://manifest.googlevideo.com/api/manifest/dash/expire/1613528382/ei/3igsYKqSDMLE4wHtzouYAg/ip/98.7.219.241/id/b963c8b1a62963b5/source/youtube/requiressl/yes/playback_host/r1---sn-ab5szn7l.googlevideo.com/mh/a4/mm/31%2C29/mn/sn-ab5szn7l%2Csn-ab5l6nzy/ms/au%2Crdu/mv/m/mvi/1/pl/18/hfr/all/as/fmp4_audio_clear%2Cwebm_audio_clear%2Cwebm2_audio_clear%2Cfmp4_sd_hd_clear%2Cwebm2_sd_hd_clear/initcwndbps/1926250/vprv/1/mt/1613506126/fvip/1/keepalive/yes/itag/0/sparams/expire%2Cei%2Cip%2Cid%2Csource%2Crequiressl%2Chfr%2Cas%2Cvprv%2Citag/sig/AOq0QJ8wRQIhALxmEAIu24yniLXr84a5V8Rnt6di4U1oZAR0Ib78MO9tAiBam0JFMqlLcA983n6MfT7UbtG9NcnAQ8WqmY9ZfNIF2w%3D%3D/lsparams/playback_host%2Cmh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps/lsig/AG3C_xAwRQIhANgSn3ZRK-F_ERVsMJAG63L7rSlFNqxA_6xjfIvQzx9VAiAN96zsvwo1RmcbqIwHkDLv46pgoAf8TxlvgEBX8xzsXA%3D%3D'
[dashsegments] Total fragments: 5698
[download] Destination: Project Management Full Course _ Learn Project Management In 8 Hours _ Simplilearn-uWPIsaYpY7U.f248.webm
[download] 100% of 793.65MiB in 02:12
[debug] Invoking downloader on 'https://r1---sn-ab5szn7l.googlevideo.com/videoplayback?expire=1613528382&ei=3igsYKqSDMLE4wHtzouYAg&ip=98.7.219.241&id=o-AKMclu6Ksh1RUBzYuu7wn4Oi3uyxluqR1iQ5nAEzbfik&itag=140&source=youtube&requiressl=yes&mh=a4&mm=31%2C29&mn=sn-ab5szn7l%2Csn-ab5l6nzy&ms=au%2Crdu&mv=m&mvi=1&pl=18&initcwndbps=1926250&vprv=1&mime=audio%2Fmp4&ns=epgscbnLVJ1vFthMfN8A64AF&gir=yes&clen=472013354&otfp=1&dur=29165.585&lmt=1613143079250813&mt=1613506126&fvip=1&keepalive=yes&c=WEB&txp=6211222&n=gPyvCCkc8nPpjuHa3d&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cotfp%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAIziYUVNVbPYOvlwWnHkwpgBrA1ARBCDJ14j1OEPYXMtAiAIHvrifs5A0PSuEV_OcOyevTQ4Sg6WIX4USSsobqVSbQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRQIgeviqoVXAa4EfMMVpDIyURcuLS_fr_cN8BS3UmJJOlQgCIQD5iDU8UAsBB2rGAQrb3KiJUxfj3OjtPjUfiDDIBhiAig%3D%3D'
[download] Destination: Project Management Full Course _ Learn Project Management In 8 Hours _ Simplilearn-uWPIsaYpY7U.f140.m4a
[debug] aria2c command line: aria2c -c -s 16 -j 16 -x 16 -k 20M --out 'Project Management Full Course _ Learn Project Management In 8 Hours _ Simplilearn-uWPIsaYpY7U.f140.m4a.part' --header 'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.14 Safari/537.36' --header 'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7' --header 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' --header 'Accept-Encoding: gzip, deflate' --header 'Accept-Language: en-us,en;q=0.5' --check-certificate=true --remote-time=true -- 'https://r1---sn-ab5szn7l.googlevideo.com/videoplayback?expire=1613528382&ei=3igsYKqSDMLE4wHtzouYAg&ip=98.7.219.241&id=o-AKMclu6Ksh1RUBzYuu7wn4Oi3uyxluqR1iQ5nAEzbfik&itag=140&source=youtube&requiressl=yes&mh=a4&mm=31%2C29&mn=sn-ab5szn7l%2Csn-ab5l6nzy&ms=au%2Crdu&mv=m&mvi=1&pl=18&initcwndbps=1926250&vprv=1&mime=audio%2Fmp4&ns=epgscbnLVJ1vFthMfN8A64AF&gir=yes&clen=472013354&otfp=1&dur=29165.585&lmt=1613143079250813&mt=1613506126&fvip=1&keepalive=yes&c=WEB&txp=6211222&n=gPyvCCkc8nPpjuHa3d&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cotfp%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAIziYUVNVbPYOvlwWnHkwpgBrA1ARBCDJ14j1OEPYXMtAiAIHvrifs5A0PSuEV_OcOyevTQ4Sg6WIX4USSsobqVSbQ%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRQIgeviqoVXAa4EfMMVpDIyURcuLS_fr_cN8BS3UmJJOlQgCIQD5iDU8UAsBB2rGAQrb3KiJUxfj3OjtPjUfiDDIBhiAig%3D%3D'

02/16 15:21:57 [NOTICE] Downloading 1 item(s)

02/16 15:21:57 [NOTICE] Allocating disk space. Use --file-allocation=none to disable it. See --file-allocation option in man page for more details.

Description

Very slow download with extremely high fragmentation (dashsegments). I have a very fast internet connection but downloading a relatively small file (500Mb) from youtube takes more than 15 to 20 minutes on some videos. I can download other videos that are much larger 2 to 3Gb in far less time. The speed varies but the fastest I can download these strange video files is about 1 to 3 Mbps and the speed never stays constant. It is always fluctuating between 1 and 3 Mbps. These files are normal youtube.com video files from respected channels.

[kpopempire]

I filed a complaint against you as well.

[kpopempire]

I will just open another one. since you just want to flip me off.