Jeff Moss

I'm testing a new way of processing the #DEFCON (And later #InfoCon) videos, can some people help test?

Check out the DEF CON 31 videos and village videos and see if they pseudo stream in your browser of choice.

Download a video or two and see if the subtitle show up in your video player.

The new changes are:
- Now encoded with AV1 instead of HEVC
- Down sampled to 25 frames a second to save on file size
- English subtitles (.srt) are now embedded in the .mp4 file.

https://media.defcon.org/DEF%20CON%2031/DEF%20CON%2031%20video%20and%20slides/

media.defcon.org

All DEF CON video presentations, music, documentaries, pictures, villages, and Capture The Flag data that can be found.

Jun 15, 2024 at 3:07amWeb
Show threadJeff MossJun 16, 2024

Based on all the positive feedback so far I’ll move to re-encoding to AV1 and embedded subtitles.

I’ve generated caption files for all the village talks that didn’t have them, in the end all past #DEFCON contest will be AV1 and captioned in English.

There is a side project Delchi is working on to generate other language captions off of the English ones, we will be testing that soon with Spanish, German, French and Chinese and add from there.

Show threadJima Jun 16, 2024

@thedarktangent Very cool!

Out of curiosity, will there be a process for native (edit: or more fluent) speakers of the other languages to submit patches to iffy translations?

(Thanks!)

Show threadJeff MossJun 17, 2024
@jima That’s a great question! I don’t know of any management system for that so it would have to be manual until a better solution is found.
Show threadKevin Thomas ✅Jun 15, 2024
@thedarktangent I just checked out a few on both phone and laptop and look great. No issues with any quality or presentation.
Show threadCyberSulu 🏳️‍🌈Jun 15, 2024
@thedarktangent Worked for me. Streaming looked pretty good. Downloaded file, opened in VLC and enabled subtitles. Checks out.
Show threadJames CarrJun 16, 2024
@thedarktangent I checked the "A Broken Marriage - Abusing Mixed Vendor Kerberos Stacks" video. It streams fine in Firefox 127, and I see the subtitles when I play the downloaded video in Celluloid 0.26. I'm using Ubuntu MATE 24.04.
Show threadAlun JonesJun 16, 2024
@thedarktangent Windows Media Player needs an AV1 codec to be installed to play the video, and there doesn't seem to be an Opus codec for WMP.
Also, WMP still (despite years of my begging) doesn't support captions in an MP4 stream. Looks like VLC is going to be the way for Windows users to stream this as it's encoded here.
Show threadJeff MossJun 16, 2024
@ftp_alun Does it stream with audio for you in edge? I’ve never tried playing it in windows media player so that is interesting. I saw W11 supposedly supports AV1 natively.
Show threadAlun JonesJun 16, 2024
@thedarktangent Either clicking on the link in the folder, or opening the file from a local download, Edge will play the video with its accompanying audio, even before I download the AV1 pack from the Microsoft Store.
It's just WMP that needs the AV1 pack downloaded to do video, and I haven't yet found the magic sauce to make WMP do the audio.
Show threadKamenRunner Jun 16, 2024
@thedarktangent Tried Firefox/Liberawolf on "HL7Magic - Medical Data Hacking Made Easy - Katie Inns". Streams in browser fine, and I can use the subtitles track with VLC when downloaded
Show threadAdriano RibeiroJun 23, 2024
@thedarktangent Everything is fine on Elmedia. Excellent video and subtitles
Show threadJeff MossJun 24, 2024
@adrianoribeiro Thank you. I’m deep in re-encoding the live music from the past few years of #DEFCON and realized I was using mono instead of stereo in my script. Grrrr.