n-parameter: Unhandled exception in decode

[betterthanever2]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2021.12.17
• 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 bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

[2023-04-20 10:45:46,804 - INFO] Downloading Парибок Андрей. Искусство сопряженное с психотехнологиями. Трансляция состояний и намерений. (id 21922) from https://youtu.be/i2-ViOyC7Ek
[debug] Encodings: locale cp1251, fs utf-8, out utf-8, pref cp1251
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.10.5 (CPython) - Windows-10-10.0.19045-SP0
[debug] exe versions: ffmpeg 4.2.3, ffprobe 5.1.2-full_build-www.gyan.dev
[debug] Proxy map: {}
[youtube] i2-ViOyC7Ek: Downloading webpage
WARNING: [youtube] Unable to decode n-parameter: download likely to be throttled (Unhandled exception in decode; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.
org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output. Traceback (most recent call last):
  File "C:\Users\USER\AppData\Local\pypoetry\Cache\virtualenvs\wapatools-3SjGFAFe-py3.10\lib\site-packages\youtube_dl\extractor\youtube.py", line 1672, in _n_descramble
    raise ExtractorError('Unhandled exception in decode')
youtube_dl.utils.ExtractorError: Unhandled exception in decode; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call you
tube-dl with the --verbose flag and include its complete output.
)
[debug] Invoking downloader on 'https://rr3---sn-fpaq25g3-oa8l.googlevideo.com/videoplayback?expire=1681998348&ei=rO1AZOLpGMOM7ATZ17jIDQ&ip=109.104.175.34&id=o-AKknyKgyubMl4R9EHIXwjBdgPDw6dl3Tx7K0_vRY3z0R&itag=140&source=youtube
&requiressl=yes&mh=QJ&mm=31%2C29&mn=sn-fpaq25g3-oa8l%2Csn-3c27snel&ms=au%2Crdu&mv=m&mvi=3&pcm2cms=yes&pl=21&initcwndbps=1542500&vprv=1&mime=audio%2Fmp4&ns=6BAWLWBNpwisYfXPM4aWKiUM&gir=yes&clen=59473523&dur=3674.813&lmt=164976146
2988446&mt=1681976453&fvip=15&keepalive=yes&fexp=24007246&c=WEB&txp=1311224&n=3cemMzCD7mQvT9&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAMvN1Ck7ififLU9D
gB2gUEyMJIq-Chp90btXUIsM_4EXAiBrVtfI5tuSrr74nfCB0Bfc3CqJs4qb3O_CHCXnLgDnNA%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpcm2cms%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgWPmhU0H_-_-em5QH0po1qzSn7vHNYSV8QH8FD5CUX00CIHTF3ofj_wY5cga1_z7
r_T4Gc4yi6z28HdeyCpBIeZBF'
[dashsegments] Total fragments: 6
[download] Destination: D:\au\youtube\Парибок Андрей. Искусство сопряженное с психотехнологиями. Трансляция состояний и намерений.-i2-ViOyC7Ek-20161004.m4a

Description

When attempting to download from Youtube, I get Unable to decode n-parameter: download likely to be throttled (Unhandled exception in decode error. Downloading happens at low speed ~50-80 Kib/s

[dirkf]

Please post the whole log without cropping the top!

In this case, I can see that you're trying to get the YT video with ID i2-ViOyC7Ek, but not what options you used. Anyhow, I can reproduce the issue and will investigate.

[betterthanever2]

Oh, I'm sorry. I'm actually using a script here, not the CLI, so the log is not cropped. But here are the options I use:

            "format": "bestaudio/best",
            "cookiefile": "D:\\Mega\\propagit\\running\\cookies.Work.txt",
            "outtmpl": f"{save_to_path}%(title)s-%(id)s-%(upload_date)s.%(ext)s",
            "writeinfotojson": True,
            "cachedir": "D:\\",
            "postprocessors": [
                {
                    'key': 'FFmpegExtractAudio',
                    'preferredcodec': 'mp3',
                    'preferredquality': '192',
                }
            ],
            "verbose": True
        }

And this happens to every video I try to download. Started yesterday.

[dirkf]

yt-dlp/yt-dlp#6131 (comment)

[dirkf]

Coming soon (the above commit):

$ python -m youtube_dl -v -F 'i2-ViOyC7Ek'
[debug] System config: [u'--prefer-ffmpeg']
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-F', u'i2-ViOyC7Ek']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.12.17
[debug] Git HEAD: 211cbfd5d
[debug] Python version 2.7.18 (CPython) - Linux-4.4.0-210-generic-i686-with-Ubuntu-16.04-xenial
[debug] exe versions: avconv 4.3, avprobe 4.3, ffmpeg 4.3, ffprobe 4.3
[debug] Proxy map: {}
[youtube] Extracting URL: i2-ViOyC7Ek
[youtube] i2-ViOyC7Ek: Downloading webpage
[debug] [youtube] Decrypted nsig crYhSJ5EIbtdN2OEP => jykH2eTdaP_Dqw
[debug] [youtube] Decrypted nsig cHQcRxq_Yj4Gi4qJ- => EKFC_eOif5yd2A
[info] Available formats for i2-ViOyC7Ek:
format code  extension  resolution note
249          webm       audio only tiny   47k , webm_dash container, opus @ 47k (48000Hz), 20.86MiB
250          webm       audio only tiny   59k , webm_dash container, opus @ 59k (48000Hz), 26.04MiB
251          webm       audio only tiny  117k , webm_dash container, opus @117k (48000Hz), 51.40MiB
140          m4a        audio only tiny  129k , m4a_dash container, mp4a.40.2@129k (44100Hz), 56.72MiB
160          mp4        256x144    144p   38k , mp4_dash container, avc1.4d400c@  38k, 25fps, video only, 16.73MiB
278          webm       256x144    144p   62k , webm_dash container, vp9@  62k, 25fps, video only, 27.53MiB
242          webm       426x240    240p   78k , webm_dash container, vp9@  78k, 25fps, video only, 34.32MiB
133          mp4        426x240    240p   85k , mp4_dash container, avc1.4d4015@  85k, 25fps, video only, 37.27MiB
134          mp4        640x360    360p  131k , mp4_dash container, avc1.4d401e@ 131k, 25fps, video only, 57.58MiB
243          webm       640x360    360p  134k , webm_dash container, vp9@ 134k, 25fps, video only, 58.99MiB
244          webm       854x480    480p  208k , webm_dash container, vp9@ 208k, 25fps, video only, 91.29MiB
135          mp4        854x480    480p  289k , mp4_dash container, avc1.4d401e@ 289k, 25fps, video only, 126.78MiB
247          webm       1280x720   720p  440k , webm_dash container, vp9@ 440k, 25fps, video only, 192.94MiB
136          mp4        1280x720   720p  628k , mp4_dash container, avc1.4d401f@ 628k, 25fps, video only, 275.33MiB
248          webm       1920x1080  1080p  596k , webm_dash container, vp9@ 596k, 25fps, video only, 261.49MiB
137          mp4        1920x1080  1080p 2500k , mp4_dash container, avc1.640028@2500k, 25fps, video only, 1.07GiB
18           mp4        640x360    360p  260k , avc1.42001E@ 260k, 25fps, mp4a.40.2@  0k (44100Hz)
22           mp4        1280x720   720p  757k , avc1.64001F@ 757k, 25fps, mp4a.40.2@  0k (44100Hz) (best)
$

[dirkf]

You can just pull the jsinterp.py from my repo, or apply the diff, if you want to integrate this into your Python script ASAP.

[tasoss]

@dirkf thanks for the fix.
i have used your master's code to download https://www.youtube.com/watch?v=fassuEegOQo but i'm getting errors.
any ideas?

[dirkf]

How should I guess? Do tell, what errors. The patch is only in my personal branch ATM while it's under test. A viable config should be yt-dl current master master with the jsinterp.py replaced by the one from the commit linked above.

[tasoss]

It would be quicker to try to download than paste the error here.
Anyway thanks.

[dirkf]

Your URL is working fine here: hence the question.

[tasoss]

This is what i get when i replace jsinterp.py in the official repo.

tasoss@starla:~/youtube-dl$ ./youtube-dl --verbose "https://www.youtube.com/watch?v=fassuEegOQo"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://www.youtube.com/watch?v=fassuEegOQo']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.12.17
[debug] Python version 2.7.18 (CPython) - Linux-5.15.108-x86_64-12th_Gen_Intel-R-_Core-TM-_i7-12700KF-with-slackware-15.0
[debug] exe versions: ffmpeg N-110228-g4dffa564d1, ffprobe N-110228-g4dffa564d1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] fassuEegOQo: Downloading webpage
WARNING: [youtube] Unable to decode n-parameter: download likely to be throttled (Unsupported JS expression in: u'if(0!=e.length){d=(d%e.length+e.length)%e.length;var f=e[0];e[0]=e[d];e[d]=f}'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output. Traceback (most recent call last):
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1670, in _n_descramble
ret = func(n_param)
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1648, in
return lambda s: jsi.extract_function_from_code(*func_code)([s])
File "./youtube-dl/youtube_dl/jsinterp.py", line 674, in resf
ret, should_abort = self.interpret_statement(code.replace('\n', ''), var_stack, allow_recursion - 1)
File "./youtube-dl/youtube_dl/jsinterp.py", line 294, in interpret_statement
ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 294, in interpret_statement
ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 366, in interpret_statement
ret, should_abort = self.interpret_statement(sub_expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 455, in interpret_statement
right_expr, expr, local_vars, allow_recursion), should_return
File "./youtube-dl/youtube_dl/jsinterp.py", line 197, in _operator
right_val = self.interpret_expression(right_expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 590, in interpret_expression
ret, should_return = self.interpret_statement(expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 274, in interpret_statement
inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 455, in interpret_statement
right_expr, expr, local_vars, allow_recursion), should_return
File "./youtube-dl/youtube_dl/jsinterp.py", line 197, in _operator
right_val = self.interpret_expression(right_expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 590, in interpret_expression
ret, should_return = self.interpret_statement(expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 579, in interpret_statement
for v in self._separate(m.group('args'))]
File "./youtube-dl/youtube_dl/jsinterp.py", line 590, in interpret_expression
ret, should_return = self.interpret_statement(expr, local_vars, allow_recursion)
File "./youtube-dl/youtube_dl/jsinterp.py", line 581, in interpret_statement
return local_vars[fname](argvals, allow_recursion=allow_recursion), should_return
File "./youtube-dl/youtube_dl/jsinterp.py", line 674, in resf
ret, should_abort = self.interpret_statement(code.replace('\n', ''), var_stack, allow_recursion - 1)
File "./youtube-dl/youtube_dl/jsinterp.py", line 587, in interpret_statement
'Unsupported JS expression ' + (expr[:40] if expr != stmt else ''), expr=stmt)
Exception: Unsupported JS expression in: u'if(0!=e.length){d=(d%e.length+e.length)%e.length;var f=e[0];e[0]=e[d];e[d]=f}'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
)
[debug] Default format spec: bestvideo+bestaudio/best
WARNING: Requested formats are incompatible for merge and will be merged into mkv.