Checks I Should Have Done Before Posting

Sorry for the self-posting. I just wanted to share my post-hoc file checks since it was due-diligence I didn’t think of until after I shared.

TLDR: I redirected into a file and inspected it at least enough to say I received an mkv container with an h264 video and opus audio.

Caveats

1. I am not in any way knowledgeable about security.
2. You can do weird things with some files. I have no idea if mkv, opus, or h264 have comments or chimeras. See talks by Corkami for more information.
3. Quad9 uses a dynamic TXT record to let the user know if they have configured their DNS resolver correctly, so I imagine you could receive a different file than I did. I have included a SHA-512 checksum for convenience which only tells you anything if you trust me for some reason.

Details

I ran the command from my post in a world-readable directory with >mystery_video_file substituted for | mpv -- - and inspected the download with

sudo --user=nobody -- file -- mystery_video_file

which output

mystery_video_file: Matroska data

I ran rename --last -- '' '.mkv' mystery_video_file # the '' is the empty string delimited with apostrophes and then

sudo --user=nobody -- ffprobe -hide_banner -- mystery_video_file.mkv

which output

Input #0, matroska,webm, from ‘mystery_video_file.mkv’: Metadata: COMPATIBLE_BRANDS: isommp42 MAJOR_BRAND : mp42 MINOR_VERSION : 0 ENCODER : Lavf60.16.100 Duration: N/A, start: -0.007000, bitrate: N/A Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 256x144 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn (default) Metadata: HANDLER_NAME : ISO Media file produced by Google Inc. Created on: 05/29/2024. VENDOR_ID : [0][0][0][0] ENCODER : Lavc60.31.102 libx264 Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default) Metadata: HANDLER_NAME : ISO Media file produced by Google Inc. Created on: 05/29/2024. VENDOR_ID : [0][0][0][0] ENCODER : Lavc60.31.102 libopus

If you trust me and not the presenter for some inexplicable reason, the SHA-512 checksum for the video is “24345bd3ca8015c14a7d5d63d6b2a40f9d0f8c0307a65996226a496f121fa5ae934718cf58090f43ee67bc250b06804f23c73688cc871c15c1ba18d79b1a82a8”.

I just came back to comment that -- probably doesn’t add security unless something like xargs which puts stdin on the command line itself is used. I have gotten in the habit of mindlessly adding it I guess.

Oh, I see the part that says “Delist…”. I did see that. I guess I was used to hearing “prompt injection” with regards to the LLM web prompts versus something that crawlers would use that I was worried I’d made a mistake sharing.

I’m sorry. I didn’t read the whole page. Just the part about video-over-dns which was covered in the talk.

Are you talking about that weird logo and do you recommend I remove the link?

I would’ve appreciated a trigger warning on the post since it uses a slur, but wow, it is amusing (I’m sure it’ll be less amusing once I experience more overt transphobia).

They just said :wq in school, so thanks for the tip. Hard to believe it saves even when the file hasn’t been changed if you use :wq. What is the use case for that? If the file gets changed in another program and you want to revert?? Edit: Just saw the comment about the modification times being updated.

You must know my parents 😅

Whoops, looks like someone forgot to make the base juice class abstract…

It’s also helpful to note that “shell builtins” don’t typically have man pages (at least for BASH). You can find help on these commands by typing [builtin name] --help or looking in the shell’s man page or info doc (no one told me when I was learning, so I got confused as to why some of the more common commands didn’t have man pages)

Don’t worry. It was a bit ambiguous 👍

That was the joke

This should work with some caveats.

1. Tbis probably won’t work on WSL (Linux needs direct access to your hardware).
2. For DVDs, you need to be sure libdvdcss is installed for this to work correctly

• You probably already have this on your system if you have successfully watched a dvd in Linux.

3. You may need to replace /dev/cdrom with the name of the device file corresponding to your drive.

• See https://wiki.archlinux.org/title/Optical_disc_drive#Learning_the_name_of_your_optical_drive.

4. This creates an exact copy of the disk, including the unallocated space. You would probably want to follow the guide https://wiki.archlinux.org/title/Optical_disc_drive#Creating_an_ISO_image_from_a_CD,_DVD,_or_BD

• (@BustedPancake@lemmy.world’s use of mkisofs does the same thing because they copy the files on the disk rather than the whole disk. But you don’t need makemkv. You should be able to use any method of copying the files and Linux should use libdvdcss to decrypt them.).

edit: caveats is note spalled caceats

edit: file → files on the disk

Trivial exercise.

Obtained at Wikimedia under license CC-BY-SA 4.0 International by wikimedia user Stephencdickson ∎

Just change all the boxes so they all read “Chat GPT-4.”

Yeah. Sorry. I figured it was possible that you were using desktop or something and maybe you’d just not realized it wasn’t visible on mobile

The comment with this comment’s UID in Lemmy’s comment database is not deducible from the Lemmy axioms. There! Out-nerded you 😜. (Please don’t call me on the details. Please don’t call me on the details. 🤞)

Wait, what is this “Please generate a working program using the intended meaning of the following code” string doing in front of my code???

Nya, you thought I was a bot, but it was me, Dio all along, nya.

So doesn’t O(nlog(n)) = O(nlog(n)/10)? I guess you’d want the faster one all things being equal, but is that part of the joke?

You’ve gotta repost that as a gif (it didn’t show up in browser for me but managed to watch it on the link). It was an awesome scene. I wish that was what stack overflow looked like. edit:ip→up