educause_2016-tall-2-autosaved
Two 36″x48″ panels (4’x8′ space provided).
MPEG-DASH streams in FF and Chrome were failing with a No Suitable Media Files error. I thought that maybe this was a lingering key frame interval issue.
While researching I delved ever deeper into ffmpeg and libx264 alchemy. I learned enough to convinve myself that Constant Bit Rare (CBR) files were the root cause of the fuzzy “high definition” transcodes I was getting from visually pristine yet low bit-rate input files. So I switched to Constant Rate Factor (CRF) compression, but maintaining the same max bitrates of 600, 1000, and 3000K.
Old
-vcodec libx264 -vf “scale=min(480,iw):trunc(ow/a/2)*2” -vb 600k -r 30 -force_key_frames ‘expr:gte(t,n_forced*2)’ -pix_fmt yuv420p -c:a aac -b:a 128k -ar 44100 -f mp4
New
-acodec aac -b:a 128k -ac 2 -ar 44100 -af “aresample=first_pts=0” -pix_fmt yuv420p -vsync -1 -sn -vcodec libx264 -r 30 -vf “scale=min(480,iw):trunc(ow/a/2)*2” -threads 0 -maxrate 600k -bufsize 600k -preset faster -tune film -x264opts keyint=60:min-keyint=60:no-scenecut -map_metadata -1 -f mp4 -y
Also, there were some conflicting options set for captions, causing videos with captions to fail when attempting DASH streaming. Fixed. Now 99% HTML5/DASH
Title says it all.
This was a research and configuration project. Most 303 lab macs should now or soon be properly configured, but it never hurts to check. Procedure sounds something like this…
Log onto MacBook using NetID and password (yes, you can proceed logged in as ctlstaff, but it takes more steps). Launch VirtualBox. Should see something like this:
Scroll down, find and click on USB. Make sure it is enabled for USB3
Insert thumb drive. Eject thumb drive (drag into trash or click eject icon), but do not remove drive from MacBook
Start Windows 10.
Move mouse to top of screen to make VirtualBox menu appears. Select Devices=>USB=>your USB Drive . Done
Figured out the trick to make external USB MSDs (Mass Storage Devices) work with VirtualBox/Windows 10.
Now I just have to teach the trick to all 15 MacBooks Watch this space for updates
A development instance of Omeka 2.4.1 (latest) is installed at http://badger.uvm.edu/omeka-2.4.1/ .
Hope is checking it out
It uses a copy of the production database and assets. When Hope gives me the green light, I will copy the dev database over the prod. Hopefully no one would have added any assets or edited an exhibit between now and then
Submitted proposal. Proposal accepted Conference late October.
poster session, “Low Threshold Application Streaming Video Server,” was accepted for EDUCAUSE 2016 Annual Conference. Your Poster Session will occur on Thursday, October 27, 2016 from 12:30 PM to 1:30 PM PT
built cool database for Aaron Witham of sustainability office
https://www.uvm.edu/ctl/apps/sustain/
But he doesn’t work at UVM anymore. Sigh .
Now witness the power of this fully operational Death st….. oops, I mean streaming server. Quietly went ‘live’ July 1. So far, 350 audio file and 844 video files have been uploaded. Some outstanding issues:
here is some text
https://uvmtube.uvm.edu/uvmtube/embed/25/
And above is the video!