Some youtube uri are incredibly slow with 2019.09.12.1 (not with 2019.08.13)

[JohnXLivingston]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.09.12.1
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

$ /var/www/peertube/peertube-latest/node_modules/youtube-dl/bin/youtube-dl -v "https://www.youtube.com/watch?v=pFxCLgsD_LU"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://www.youtube.com/watch?v=pFxCLgsD_LU']
WARNING: Assuming --restrict-filenames since file system encoding cannot encode all characters. Set the LC_ALL environment variable to fix this.
[debug] Encodings: locale ANSI_X3.4-1968, fs ANSI_X3.4-1968, out ANSI_X3.4-1968, pref ANSI_X3.4-1968
[debug] youtube-dl version 2019.09.12.1
[debug] Python version 2.7.16 (CPython) - Linux-4.19.0-5-amd64-x86_64-with-debian-10.1
[debug] exe versions: ffmpeg 4.1.4-1, ffprobe 4.1.4-1
[debug] Proxy map: {}
[youtube] pFxCLgsD_LU: Downloading webpage
[youtube] pFxCLgsD_LU: Downloading video info webpage
[youtube] pFxCLgsD_LU: Downloading MPD manifest
[debug] Default format spec: bestvideo+bestaudio/best
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on u'https://manifest.googlevideo.com/api/manifest/dash/expire/1568993018/ei/mpqEXf6FE9O3VLmav_gM/ip/2001%3A910%3A1410%3A100%3A%3A1/id/a45c422e0b03fcb5/source/youtube/requiressl/yes/playback_host/r4---sn-a0jpm-a0ms.googlevideo.com/mm/31%2C29/mn/sn-a0jpm-a0ms%2Csn-25glene6/ms/au%2Crdu/mv/u/mvi/3/pl/38/tx/23722138/txs/23722138%2C23722139/hfr/all/as/fmp4_audio_clear%2Cwebm_audio_clear%2Cwebm2_audio_clear%2Cfmp4_sd_hd_clear%2Cwebm2_sd_hd_clear/mt/1568971257/fvip/4/itag/0/sparams/expire%2Cei%2Cip%2Cid%2Csource%2Crequiressl%2Ctx%2Ctxs%2Chfr%2Cas%2Citag/sig/ALgxI2wwRgIhAONIiLviWx5ZlYg0btKFZaCyuuWa3u8RdoLQ4zRQ2s7BAiEA1TRZIozjaYGWdvTT2J3T3m65Zy74Wh3wu0DbXlV9dSI%3D/lsparams/playback_host%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl/lsig/AHylml4wRQIhAKlIrHPqOzBrlnTSnyafEImMR78higma17Q1HTumcUJ4AiAUc0EDJyp-VO90_Bn4tvETZlXbDK13BSlYC8PTaI-LqQ%3D%3D'
[dashsegments] Total fragments: 36
[download] Destination: Clip_chambre_a_air-pFxCLgsD_LU.f248.webm
[download]   5.6% of ~10.49MiB at 16.54MiB/s ETA 01:14:12

Description

On some youtube's video (like https://www.youtube.com/watch?v=pFxCLgsD_LU ), with youtube-dl 2019.09.12.1 the download is incredibly slow. It says 16.54MiB/s, but in fact it is stuck for a long time at the same percentage of completion. It take about 2 minutes to download 1Mo.

$ ls -lh 
total 1.4M
-rw-r--r-- 1 john john 1.4M Sep 20 09:30 Clip_chambre_a_air-pFxCLgsD_LU.f248.webm.part
-rw-r--r-- 1 john john   50 Sep 20 09:30 Clip_chambre_a_air-pFxCLgsD_LU.f248.webm.ytdl
$ ls -lh 
total 2.2M
-rw-r--r-- 1 john john 2.2M Sep 20 09:32 Clip_chambre_a_air-pFxCLgsD_LU.f248.webm.part
-rw-r--r-- 1 john john   50 Sep 20 09:32 Clip_chambre_a_air-pFxCLgsD_LU.f248.webm.ytdl
$ ls -lh 
total 4.4M
-rw-r--r-- 1 john john 4.4M Sep 20 09:38 Clip_chambre_a_air-pFxCLgsD_LU.f248.webm.part
-rw-r--r-- 1 john john   50 Sep 20 09:38 Clip_chambre_a_air-pFxCLgsD_LU.f248.webm.ytdl

This is not a bandwidth issue, I am on a web server.

The same url with youtube-dl 2019.08.13 worked perfectly.

[dstftw]

>youtube-dl.exe pFxCLgsD_LU -f 248
[youtube] pFxCLgsD_LU: Downloading webpage
[youtube] pFxCLgsD_LU: Downloading video info webpage
[youtube] pFxCLgsD_LU: Downloading MPD manifest
[dashsegments] Total fragments: 36
[download] Destination: Clip chambre à air-pFxCLgsD_LU.webm
[download] 100% of 24.70MiB in 00:44