videos

Video: Alpine Linux-based LiveCD with OpenVZ kernel / tools

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I recently encountered an Alpine Linux developer in the #openvz Freenode IRC channel who was working on an Alpine Linux-based LiveCD that uses the OpenVZ Legacy stable kernel and tools. If you aren't familiar with Alpine Linux (and I wasn't prior), it is a very minimal Linux distro that uses BusyBox. The LiveCD shafire (his IRC nick) created is ~ 100MB in size. Since I know OpenVZ very well, shafire asked me to lend a hand with testing.

I recorded a screencast that shows using the LiveCD from start to finish. Being very small, and needing storage space for containers, besides the LiveCD you really need a disk partition for permanent storage. The video shows booting the CD, a few manual steps that are needed to get a proper environment established, creating two containers, starting them, entering them and running some simple commands, shutting them down, and shutting down the host. I did all of the testing using a KVM virtual machine which made it easy for video capture. The video runtime is about 11 minutes and there was no editing of the video... everything is absolutely in real-time with no speedups. It is just THAT fast. :)

The embedded video is in webm/vp9 format and should play fine in contemporary versions of Firefox and Google Chrome. If you are using another browser and can't play the video, feel free to use the link under the video to download it and play with a recent version of the VLC media player. Looks like some video feeds that pick up my blog (planet.openvz.org for example) aren't embedding it properly so in that case, use the link under the video. That should work.

If you prefer to download and play in local media player, here's the direct URL:
alpine-based-openvz-livecd-demo.webm

For those interested in screencast creation and video conversion stuff, I used vokoscreen to capture my screen. It natively output a 175.9 MB .mkv file. I used ffmpeg to convert it to a webm file (vp9 video codec, no audio). The resolution is > 480p and the quality is very good... but amazingly, the filesize for the 11 minute video is only 1.7 MB. I guess ffmpeg / vp9 are awesome at comrpession of this genre of video. I set an upper limit of 200 Kbit for the video bitrate but using a variable bitrate it was able to greatly reduce the bitrate for the bulk of the video.

Video: Raspberry Pi Zero

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Wow. $5. No built in networking but hey. I wonder if I can find a copy of the magazine?

For those with iFrame issues, here is the direct YouTube link:
https://www.youtube.com/watch?v=NFFQmdUc5Vg

Video: systemd Status Report 2015

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Did you know there was a systemd conference? Well there is... and it was even held recently... and the videos from it were published rather quickly. Here is Lenny giving a status update. Enjoy! The first 10.5 minutes are announcements so skip to 10:30 to get to the start of the actual talk.

For those who are iframe impared, here's the direct youtube link:
https://www.youtube.com/watch?v=I4AAjEaTehk

Video: Recent public talk with Linus Torvalds

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Linux Foundation head Jim Zemlin interviewed Linus Torvalds on stage at LinuxCon North America 2015. I thought it was worth sharing. Enjoy!

Here's a direct YouTube link for anyone with browser iframe issues: https://www.youtube.com/watch?v=5xKXHavHJ7U

Here is a summary of an even more recent public interview with Linus from LinuxCon Dublin. I hope a video of it is made available in the not-too-distant future.

Video: Blender's new short film and ffmpeg vp9 test

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About a month ago the Blender folks released a new film project named Cosmos Laundromat.

Two days ago the ffmpeg folks released version 2.8. I saw one of the changes was that for webm they are now defaulting to using the vp9 video codec and the opus audio codec. Previous releases defaulted to webm with vp8 and ogg.

I've been following vp9 for a few years now... and every once in a while I'd try the libvpx tools and ffmpeg's support for vp9... but it was never quite there yet for non-experts (me). With this release, I say that vp9 is very, very close to viable. The only problem is that the encoding speed still leaves a lot to be desired. For the best results, two pass encoding is required. Using a number of 1080p video sources in h.264 format (all of the Blender films downloaded from YouTube) and a contemporary Intel i7 CPU, I get a little over 100 Frames Per Second (FPS) on pass 1 and between 7 - 9 FPS on pass 2. With a video that is ~24 FPS (all my source videos) it takes a little over 3x realtime to encode them. Well, more because of the two passes. The more popular codecs in ffmpeg are better than real time including vp8/ogg-based webm. Of course those numbers are all highly variable depending on the source material and the hardware you run it on... but you get the idea.

Ok, so encoding speed isn't so great. I'm sure that will get better over time. I'd expect it to be cut in half sometime over the next couple of years... if we are lucky... that and faster hardware... and perhaps GPU encoding support in newer hardware.

But anyway, enough about the encoding speed, how is the quality? Well, see for yourself. I think it truly lives up to the 1/2 the filesize for the same quality compared to vp8/ogg or h.264. I embed Cosmos Laundromat above then directly link to additional ones below if you want more. vp9/opus webm files should play in contemporary versions of Firefox, Google Chrome, Microsoft IE if you have some plugin installed (haven't tried it) and supposedly coming soon to Microsoft's Edge browser in Windows 10. Safari? Probably never. Play in your browser or right-click download and play with your preferred media player.

Don't blame any download / playback retrieval slowness on vp9... it's probably a lack of bandwidth on the server side... so be patient and pause it until some is buffered. Moving around the playhead should work fairly well unless bandwidth is an issue.

Full screen that if you want. Doesn't that look great? It's 720 x 302 resolution with 400 kbit video and 96 kbit audio. That's why all of the files have 496k in the name. So that's like 62KB / second transfer. Pretty good quality huh?

More vp9 re-encodes with ffmepg 2.8:

2006-Elephants_Dream-496k.webm (38.4MB, 10:53)
2008-Big_Buck_Bunny-496k.webm (31.8 MB, 9:56)
2010-Sintel-496k.webm (52.9 MB, 14:48)
2012-Tears_of_Steel-496k.webm (43.3 MB, 12:14)
2013-Caminandes-Gran_Dillama-496k.webm (8.7 MB, 2:26)

Want to know how it works on Hollywood / live action movies? Here's the trailer for the upcoming film, "The Martian". I don't think I'll get into any trouble for posting a trailer, right? Again, 720 x 405 @ 496 kbit. The black bars were in the original and I didn't remove them.

2015-The_Martian-Trailer-496k.webm (11.5 MB, 3:17)

Want to give vp9 a try? I doubt many distros have packages for ffmpeg 2.8 yet but you can download the static .tar.xz from ffmpeg's site and run it on most Linux distros. That's what I did. I'll leave finding the URL up to the reader because it will certainly change.

So far as encoding goes, I didn't do anything fancy. Just something like:

ffmpeg28 -y -i source.mp4 -f webm -vf scale=720:-1 -b:v 400k -an -pass 1 output.webm.pass1 ;
ffmpeg28 -y -i source.mp4 -f webm -vf scale=720:-1 -b:v 400k -b:a 96k -pass 2 output.webm

I took the static ffmpeg binary and plopped it in ~/bin/ffmpeg28 so I could easily tell it apart from the stock ffmpeg binary. Enjoy!

Video: The Mystery of Dan Walsh

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Everyone knows Red Hat's Dan Walsh as the SELinux guy... and more recently as the guy who pronounces Docker in a Boston accent as "Dockah". Turns out he was the subject of a recent TNT Network's Rizzoli and Isles episode. Enjoy. Oh, and, "All roads lead... to Dan Walsh." (the missing last 3 seconds)

For those with iFrame issues, here's the direct link: dan-walsh-mystery.webm

Video: The Next Big Little Thing, C.H.I.P.

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I ran across this video today. I know there is a lot of fever over the $9 C.H.I.P. but I found it very interesting listening to one of the C.H.I.P. guy talk about the challenge and the rewards of such a project. Enjoy!

Video: LibreOffice - Online and the Cloud

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Ever experienced a presentation by Michael Meeks? He reminds me of Monty Python... but I digress. Michael is a well known LibreOffice person and here is a recent talk (published June 26, 2015) from him for, I assume, the Swish Open Source User Group.

I decided today would be a good day to post this because LibreOffice 5 was released. Enjoy!

Video: Super Privileged Containers

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For anyone who hasn't seen this yet who is interested in containers, this is a must see. Watch Red Hat's SELinux guru Dan Walsh explain and demo Super Privileged Containers from the Red Hat Summit 2015. Enjoy!

For those who are iFrame challenged, here's the direct YouTube link: https://www.youtube.com/watch?v=dM2Fc53Dtd4

Video: systemd at the Core of the OS

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Oh look... another presentation by Lennart on systemd... this one from the CoreOS Fest 2015. Enjoy!

For those who are iFrame challenged, here's the YouTube link: https://www.youtube.com/watch?v=VIPonFvPlAs

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