Getting `IndexError` in some executions of the program

[rodrigomorales1]

Prerequisite

• [x] I have updated to the latest version,
• [x] (If applicable) I have ensured the password is correct with the flag -v 0,
• [x] I have searched the opened and closed issues for a duplicate,

Describe the bug

I'm getting IndexError in some executions of the program (see below).

Error.

$ ./zoomdl --cookies ~/Downloads/cookies.txt -u 'https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ' 
Found 2 screens, downloading all of them
Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/home/myusername/Programs/zoomdl/./zoomdl/__main__.py", line 20, in <module>
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/__init__.py", line 18, in main
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 210, in download
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 115, in download_vid
IndexError: list index out of range

Again. Error.

$ ./zoomdl --cookies ~/Downloads/cookies.txt -u 'https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ' 
Found 2 screens, downloading all of them
Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/home/myusername/Programs/zoomdl/./zoomdl/__main__.py", line 20, in <module>
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/__init__.py", line 18, in main
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 210, in download
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 115, in download_vid
IndexError: list index out of range

Again. Error.

$ ./zoomdl --cookies ~/Downloads/cookies.txt -u 'https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ' 
Found 2 screens, downloading all of them
Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/home/myusername/Programs/zoomdl/./zoomdl/__main__.py", line 20, in <module>
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/__init__.py", line 18, in main
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 210, in download
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 115, in download_vid
IndexError: list index out of range

Whoops. It worked.

$ ./zoomdl --cookies ~/Downloads/cookies.txt -u 'https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ' 
Found 2 screens, downloading all of them
File /home/myusername/Programs/zoomdl/Algoritmos_y_Estructura_de_datos_-_CS2100_-_TEORÍA_-_1_-_18_00_-_20_00screen0.mp4 already exists. This will erase it Continue? [y/N]:

To Reproduce

1. Download the video I would download. I've posted the URL video in the URL section because I guess that this is because an unbad handling of a URL that is generated of the URL of the video being downloaded, so I hope that helps.

Expected behavior

The error is not generated, or handled and the user is informed.

Screenshots

URL (opt)

https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ

Logs

The logs have already been provided in one of the first sections.

Versions

• OS: Arch Linux
• Python Version: 3.9.5

The version I'm currently using is (latest master branch as for the time of this writing)

$ git rev-parse HEAD
26d2da3f26e4ad81fef8bdef64fb1354339637ad

[rodrigomorales1]

Here's more information that might be useful for solving this issue.

I tried executing the program again but added the following print statement in a line before the error is reported.

        for vid_num, vid_url in enumerate(all_urls):
            print(f"[FOO: {vid_url}]")
            extension = vid_url.split("?")[0].split("/")[-1].split(".")[1]

Thus, I noticed the following. Note that =vid_url= is sometimes empty.

$ ./zoomdl --cookies ~/Downloads/cookies.txt -u 'https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ' 
Found 2 screens, downloading all of them
[FOO: ]
Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/home/myusername/Programs/zoomdl/./zoomdl/__main__.py", line 20, in <module>
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/__init__.py", line 18, in main
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 211, in download
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 116, in download_vid
IndexError: list index out of range

$ ./zoomdl --cookies ~/Downloads/cookies.txt -u 'https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ' 
Found 2 screens, downloading all of them
[FOO: ]
Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/home/myusername/Programs/zoomdl/./zoomdl/__main__.py", line 20, in <module>
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/__init__.py", line 18, in main
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 211, in download
  File "/home/myusername/Programs/zoomdl/./zoomdl/zoom_dl/zoomdl.py", line 116, in download_vid
IndexError: list index out of range

In the execution shown below, the URL is not empty but has been hidden because of security concerns.

$ ./zoomdl --cookies ~/Downloads/cookies.txt -u 'https://utec.zoom.us/rec/play/BqQCvFHnsW8S_uPtWzSZw2ce9vRVmZugEyt1NUv3lluYHp_bQicLYN3xuJLYVSwKwP_rdz_g3AOXgYvV.HprsohVuxRQ8oZxJ' 
Found 2 screens, downloading all of them
[FOO: <<ommited-because-of-security-concerns>>]
File /home/myusername/Programs/zoomdl/Algoritmos_y_Estructura_de_datos_-_CS2100_-_TEORÍA_-_1_-_18_00_-_20_00screen0.mp4 already exists. This will erase it Continue? [y/N]: 

Hope this information helps.

[Talinx]

I got the same problem because one item of all_urls was the emtpy string "". (This is the case because url in metadata is not set.) Removing it fixed it for me: https://github.com/Talinx/zoomdl/commit/cbbdac83b035fa7cd66af3558978cd91f29f3d97 Unfortunately, I can not test the video URL you provided because I do not have permission to view it.

[Battleman]

I identified the problem, thanks for the heads-up and the nice debugging. It should be deployed very soon.

[Battleman]

@rdrg109 @Talinx can you confirm the latest Beta works?

[Talinx]

Works for me, thank you very much!