Youtube get URL with slow speed download

[Alehap]

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• I'm asking a question and not reporting a bug or requesting a feature
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• I've verified that I'm running yt-dlp version 2023.02.17 (update instructions) or later (specify commit)
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Hi,
I'm wondering if anyone else is having the same problem as me in that the URL of the Youtube video occasionally has sluggish download speed (around 30KB/s), especially with video format id 137?

The download speed is too slow about 161KB/s but many videos have better speed:

[youtube] Extracting URL: yTCDVfMz15M
[youtube] yTCDVfMz15M: Downloading webpage
[youtube] yTCDVfMz15M: Downloading android player API JSON
[info] yTCDVfMz15M: Downloading 1 format(s): 22
[download] Destination: P!nk - Try (Official Video) [yTCDVfMz15M].mp4
[download] 100% of   19.67MiB in 00:00:00 at 51.88MiB/s

Do you think this is an issue?
Thanks.

Provide verbose output that clearly demonstrates the problem

• Run your yt-dlp command with -vU flag added (yt-dlp -vU <your command line>)
• Copy the WHOLE output (starting with [debug] Command-line config) and insert it below

Complete Verbose Output

# yt-dlp -vUf 135 https://www.youtube.com/watch?v=xspg7SNxTWA
[debug] Command-line config: ['-vUf', '135', 'https://www.youtube.com/watch?v=xspg7SNxTWA']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out UTF-8, error UTF-8, screen UTF-8
[debug] yt-dlp version 2023.02.17 [a0a7c01] (pip)
[debug] Python 3.7.16 (CPython x86_64 64bit) - Linux-4.18.0-408.el8.x86_64-x86_64-with-Ubuntu-18.04-bionic (OpenSSL 1.1.1  11 Sep 2018, glibc 2.26)
[debug] exe versions: ffmpeg information (setts), ffprobe information
[debug] Optional libraries: Cryptodome-3.17, certifi-2022.12.07, mutagen-1.45.1, sqlite3-2.6.0, websockets-9.1
[debug] Proxy map: {}
[debug] Loaded 1782 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Latest version: 2023.02.17, Current version: 2023.02.17
yt-dlp is up to date (2023.02.17)
[youtube] Extracting URL: https://www.youtube.com/watch?v=xspg7SNxTWA
[youtube] xspg7SNxTWA: Downloading webpage
[youtube] xspg7SNxTWA: Downloading android player API JSON
[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, filesize, fs_approx, tbr, vbr, abr, asr, vext, aext, hasaud, id
[info] xspg7SNxTWA: Downloading 1 format(s): 135
[debug] Invoking http downloader on "https://rr1---sn-4g5edndk.googlevideo.com/videoplayback?expire=1677515027&ei=s4T8Y8GHO5rUx_AP35WQqA4&ip=2a01%3A4f8%3Ac012%3Ab3a8%3A%3A1&id=o-AIxNKYAlgaop4aDLJjX4yRbnMKseszlaJ5r0ZJ0eVKrP&itag=135&source=youtube&requiressl=yes&mh=qW&mm=31%2C26&mn=sn-4g5edndk%2Csn-f5f7lnl7&ms=au%2Conr&mv=m&mvi=1&pl=55&initcwndbps=416250&spc=H3gIhs1kP_ug_Xp9ODDuze4ZxXFwTH4&vprv=1&svpuc=1&mime=video%2Fmp4&gir=yes&clen=36627864&dur=441.120&lmt=1651178714289365&mt=1677493029&fvip=5&keepalive=yes&fexp=24007246&c=ANDROID&txp=4532434&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cspc%2Cvprv%2Csvpuc%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIgPozUSci2egLWCG2vrCMVyejJl1j3bXxX1tG1_6tzEg4CIQDeE4-uoYSdwTlh-zYWPXfKFBh5FOVxp1Cr2q75kH34BA%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRQIhAPUiwVIkp1MlH9CHSuExUXn2Wrd9OYwkVkuAVv7YY-uCAiAtQ8hRWW3eWF9ZzOJ2AG7S-2SXagZRzJZurS-GARquSw%3D%3D"
[download] Resuming download at byte 915795
[download] Destination: At the Cross - Hillsong Worship [xspg7SNxTWA].mp4
[download]  16.4% of   34.93MiB at  161.57KiB/s ETA 03:05

[GrauBlitz]

Can confirm, but only on some URLs, don't see a pattern, it also variated on one channel with different videos.

[sergeychur]

Can confirm, same random behaviour.

[pukkandan]

I can't reproduce. Is this on a VPS? or on home IPs? Do you get same issue from different IP?

Edit: Can repro now

[GrauBlitz]

Normal home connection, reconnection/new leased ip does not change anything.

[pukkandan]

"new leased ip" would be in the same network, right? If you are able to, try with a different network or maybe a VPN. We have observed speed issues in the past due to CDN problems. Since multiple people reported this back to back, that may not be the issue this time - but worth checking

[CorentinB]

I can confirm I see the same behavior on my side.

[itszennie]

Happened to me as well. Tried a couple times on different drives (SSD vs. HDD), tried different amounts of concurrent downloads and didn't help. Though I only tried with one vid and then I let it be until the next day, when everything went smooth again. I'm running optical internet so DL speed wouldn't be a problem.

[Alehap]

I'm trying on many VPS, and the problem appears at random. (and I dont see the issue with profile 720p, 360p)
Here's some additional information:
I have two VPSs, VPS A with regular download speeds and VPS B with sluggish download speeds.
I attempt to download the URL ytdlp created on VPS A to VPS B => Download speed is normal.
When I try to download on VPS A, the URL created on VPS B is sluggish.

So I think the issue may be come from URL generation function.

[scrutinizer11]

This video is particularly slow https://www.youtube.com/watch?v=kFp61MtbPbU Little Snitch shows a download speed of 300 Kb/s, the size is appr. 1GB, format - webm, h.264, 1080p.

It runs via proxy on port 3128 (macOS). What's interesting though is that glancing at the process yt-dlp in Activity Monitor reveals that it uses localhost:62760->localhost:ndl-aas

Relevant or not, it didn't pose a tangible problem related to speed.

[nicolaasjan]

This video is particularly slow https://www.youtube.com/watch?v=kFp61MtbPbU

(btw, your URL points to:

https://github.com/yt-dlp/yt-dlp/issues/url... Should be https://www.youtube.com/watch?v=kFp61MtbPbU)

Here:

[download] 78.1% of 542.91MiB at 12.39MiB/s ETA 00:09^C

[Edit]
That was yesterday.
Now feb 28) it's slow... :

[download] 1.3% of 842.59MiB at 459.39KiB/s ETA 30:54^C

[scrutinizer11]

I have [download] 0.9% of 542.91MiB at 298.33KiB/s ETA 30:45