Another method that can be used for MP4 files, as well as the above file types is the Concat Demuxer method, if the files use the same codecs and parameters, such as resolution, framerate, etc. If the files have the same characteristics, you can use a command of the form:

ffmpeg -f concat -safe 0 -i inputFileList.txt -c copy output.mp4

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FFmpeg provides a suite of command-line interface tools for working with audio and video files. It is free and open-source software that is available for a variety of operating systems, including Microsoft Windows, Linux, and macOS. If you wish to use it on a Microsoft Windows system, you can install it with the Windows Package Manager known as winget by opening a command prompt window and issuing the command winget install "FFmpeg (Essentials Build)".

Microsoft Windows [Version 10.0.26100.7623]
(c) Microsoft Corporation. All rights reserved.

C:\Windows\System32>winget install "FFmpeg (Essentials Build)"
Found FFmpeg (Essentials Build) [Gyan.FFmpeg.Essentials] Version 8.0.1
This application is licensed to you by its owner.
Microsoft is not responsible for, nor does it grant any licenses to, third-party packages.
Downloading https://github.com/GyanD/codexffmpeg/releases/download/8.0.1/ffmpeg-8.0.1-essentials_build.zip
  ██████████████████████████████   101 MB /  101 MB
Successfully verified installer hash
Extracting archive...
Successfully extracted archive
Starting package install...
Command line alias added: "ffmpeg"
Command line alias added: "ffplay"
Command line alias added: "ffprobe"
Path environment variable modified; restart your shell to use the new value.
Successfully installed

C:\Windows\System32>

If you need to trim the beginning of a video file, such as a .mp4 file, you can do so using a command of the form ffmpeg -ss hh:mm:ss -i input.mp4 -c copy output.mp4 where you specify the point you wish the video to start in the form hh:mm:ss for hours, minutes, and seconds with -ss and input.mp4 is the file you wish to trim and output.mp4 is the name you wish to give to the trimmed file. E.g., if I have a video file, REC-0001-A.mp4, where I wish to discard audio and video up to the 3 minutes and 34 seconds mark in the file, I can use ffmpeg -ss 00:03:34 -i REC-0001-A.mp4 -c copy output1.mp4 to create a new file, output1.mp4, that omits the first 3 minutes and 33 seconds from the input file. Using the -c copy option copies the video/audio streams directly, which is fast but can be less accurate on keyframes.

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https://ytdown.to/en2/
https://v6.www-y2mate.com/

Since I had WinPython, a free and open-source version of the Python programming language installed on a Windows laptop and she is using a Windows 11 system at the moment, though she wants to switch to Linux, I decided to try the yt-dlp Python program that allows one to download YouTube videos from a command-line interface (CLI).

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If the LG TV is visible to other devices on the network, such as the PC, you should see it within "Media Devices" under "Network" in the Windows File Explorer.

If you have an MPEG-4 (.mp4) or Audio Video Interleave (.avi) file on the PC, you can right-click on video file, then choose "Show more options," and then choose "Cast to Device" at which point you should see the LG TV as a device to which you can stream the video.

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Many—but not all—live-streamed programs are recorded. We understand it's not always possible to watch a program in real time, and as a courtesy to ticket buyers we are glad to make recordings available within 24 hours after the program has taken place. The recordings can be viewed for up to three days (72 hours) after they become available.

SmithSonian Associates has stated that they don't have sufficient storage space to make the recordings permanently available. If you can't watch the recording within the 3 days it will be available or want to have a permanent copy available for future reference, you can take the steps listed below to download an MP4 file of the recorded presentation.

If you click on the Watch button from your Encores page on the Smithsonian Associates website, you will be taken to a Zoom webpage. You can watch the video from that page, but if you right-click on the video, you will not see any option to save it. So you need to install a browser extension that will enable right-clicks to work on pages where they have been disabled.

Note: the instructions below are specifically for the Brave browser on a Microsoft Windows system, but the procedure for other browsers is likely to be similar.

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Related articles

1. Downloading Video Clips with Offliberty
   Date: January 26, 2014

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I verified I had the latest version of the program, 2021.12.17.

$ youtube-dl --version
2021.12.17
$

To obtain further information on the error, I then ran the script with the --verbose option which showed me more details on the error.

The software, which is a command-line program to download videos from YouTube.com and other video sites, is maintained by ytdl-org and, on a Github webpage for the organization, I found issue #32247, ERROR: Unable to extract uploader id, which attributed the error to YouTube recently starting to add that "at sign", i.e., @, to URLs. jgmayer, who posted his comments and the solution just 3 hours before I encountered the problem, posted the following solution:

The solution is to go to the file that you getting the error:
"/usr/local/Cellar/youtube-dl/2021.12.17/libexec/lib/python3.10/site-packages/youtube_dl/extractor/common.py"

Find the following line:

'uploader_id': self._search_regex(r'/(?:channel|user)/([^/?&#]+)', owner_profile_url, 'uploader id') if owner_profile_url else None,

Replace with the following:

'uploader_id': self._search_regex(r'/(?:channel/|user/|@)([^/?&#]+)', owner_profile_url, 'uploader id', default=None),

The poster indicated the relevant file is /usr/local/Cellar/youtube-dl/2021.12.17/libexec/lib/python3.10/site-packages/youtube_dl/extractor/common.py, but there is no /usr/local/Cellar directory on my system and running the script with the verbose option, showed the relevant code is on line 1,794 of /usr/local/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py.

After making the suggested change, I was able to download a YouTube video with the program.

$ youtube-dl https://www.youtube.com/watch?v=JmSmjDngVXM
[youtube] JmSmjDngVXM: Downloading webpage
[download] Destination: Ancient Greek Lesson #1 _ Learn Greek Fast Online-JmSmjDngVXM.mp4
[download] 100% of 14.88MiB in 04:20
$

The updated youtube.py that can be used to replace the 2021.12.17 version in /usr/local/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py.

References:

1. ERROR: Unable to extract uploader id #32247
   By: jgmayer
   Date: May 29, 2023
   Github - ytdl-org / youtube-dl

Related Articles:

1. Python script to download YouTube videos on Mac OS X

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1. Right-click on the video in Panoptoo—you may need to click on the small video in the upper, left-hand side of the window rather than the one on the right side of the window—and select "Inspect Element (Q)." In the "Search HTML" field, type .mp4 and hit Enter—this presumes the video is an MP4 video.
2. You should see the area in the HTML code where the MP4 file is referenced highlighted. Right-click on the highlighted area and choose "Copy" then "Outer HTML."
3. Then paste the information copied into the clipboard into Microsoft Notepad or some other text editor, depending on your operating system and preferred editor. You should see the URL for the video listed in the content pasted into the editor. Copy the URL starting with the "https" up through the ".mp4"—don't copy the information after the ".mp4."
4. Paste the copied URL into a browser tab. You can then right-click on the video in that browser tab and select "Save Video As" to download the video to your local system. You can give the video a more meaningful name than the long string of hexadecimal digits used for the name.

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