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On Demand and Streaming Video Captioning Project
DMI at Georgia Tech is a great system! http://www.media.gatech.edu/
One of the things it cannot do is caption streaming and on-demand videos. The purpose of this project, site is to explore captioning of live video at Georgia Tech.
This project consist of this site with the latest JW Player, A server with Wowza Streaming Engine Perpetual Bundle Unlimited Edition and for streaming live events; both an EGG HD491 and VidiU encoder - and some very clever behind the scenes work by the GT CATV RF Spec, OIT - Network Engineering group. We are also looking at the legacy DMI servers and exploring the possibility of captioning video on demand served from those.
The team has done some great work and we are now able to stream live video with captions using our hardware/software to JW Player and YouTube. You can see some of the captioned recordings under the VOD link above. We can also push the stream from our Wowza server to Kaltura and Facebook, but for now the 608 embedded captions do not display there. Please look at this page: Live Event Kaltura iFrame embed. Kaltura is the Future of streaming media, live and on-demand, at Georgia Tech and everyone at Tech should use it to live stream video with captions. All content from the legacy DMI system should be migrated to Kaltura Mediaspace by January 2016.
Anyone with access can create a live stream today from Add New> Live Event after logging into mediaspace.gatech.edu. The Live Event Kaltura iFrame embed page above will show a live feed when it is streaming and a recording of the live feed after the event is over if the resulting recording is changed from private to unlisted. Subsequent recordings on the same live event append the recording so it may make sense to clip the recording and save it, then delete the recording before the next live event. Captions on the recording are machine generated and added to the recording after the live event. This page shows my first attempt to embed the Kaltura iFrame in a Drupal page. This probably can be finessed by Drupal expert. The out of the package page on mediaspace.gatech.edu works better than my current embed: https://mediaspace.gatech.edu/edit/1_juxvpy8q. A work flow for the best way to produce and manage Kaltura live streams still needs to be developed.
I discussed live streaming captions with Kaltrua and one of their partners, Uvision (videolinq http://www.videolinq.com/). It appears that today we could live stream captioned Katura video by using the videolinq cloud service with our existing EEG 491 hardware encoder. Other USG schools may be able to do this also if they subscribe to EEG Falcon Cloud (https://eegent.com/falcon) Please see the workflow from the vendor below.
Unfortunately, some recent staffing changes have forced me to reduce my effort around this project and I will have to leave the testing and implementation of the live stream captioning capability of Katura up to others, for now.
7/28/16 - Today with the help of the folks at JW Player we solved the auto-display captions requirement. Now the McCammish Control and OIT_MyStream123 pages on this site have the new code that auto displays captions when live streaming. Captions are displaying automatically in YouTube Live Events http://b.gatech.edu/2aAydVD ; but only in on the iPhone and iPad in the Kaltura player http://b.gatech.edu/2ay4NpH
7/1/16 - Today we successfully pushed the live feed from Wowza to Kaltura and YouTube. Even though this test feed had captions enabled we were unable to see them on the respective players. We will test again this month with a test production feed.
We have been doing some initial work with the Kaltura project team to investigate the migration of video content in DMI to Kaltura. The link below is to a file that was imported directly from DMI in to Kaltura. We also added an srt captioning file to the video.
The current production GT live streaming service is now being supported only by stream.media.gatech.edu (wow04).
Wow! The weekend of 6 and 7 May, 2016 was a banner weekend for the project! We provided emended captioning in the live video feeds of commencement ceremonies:
Useful code for embedding live streams in Drupal: http://drupal.gatech.edu/embed-live-streaming-video-oit
We are continuing to look at accessibility issues. Here is a demo page that shows a captioned video on demand using an accessible player: http://jwplayer.media.gatech.edu/ccplayer.html. Note how all controls are accessible from the keyboard (use tab key to access). This is built with ccPlayer from NCAM. http://ncam.wgbh.org/invent_build/web_multimedia/tools-guidelines/ccplayer
Not all of the links above are active all the time:
- VOD - You can see a basic Video On Demand (VOD) from this link. This video is served from wow04 and played on the JW Player on this site. This video shows a recording of one of our early test of live stream captioning.
- local video - You can see a basic video from this link. This video is served from this site and played on the JW Player on this site.
- CaptVideo - You can see a sample captioned video from this link. This video is served from this site and played on the JW Player on this site. You can always turn the captions on and off with the red "CC" button on the player. This button is only available when the player detects captions.
- OIT_MyStream* links - You can see different resolution feeds from the EGG HD491 when they are available. The CEA-608 captions are injected into H264 SEI messages of an HTTP Live Streams. It is processed by wow04 and played by the JW Player on this site.
- WedVTT Caption of DMI VOD - You can see a WebVTT captioned video from this link. This sample VTT file was created with https://developer.microsoft.com/en-us/microsoft-edge/testdrive/demos/captionmaker/ and is served from this site. The video is a standard DMI video played from the DMI repository and both are played with the JW Player on this site. This Video On Demand also demonstrates the captions on by default and auto play options in JW Player.
- WebVTT Caption of VOD - You can see a WebVTT captioned video from this link. The VTT file is served from this site. The video is is served from wow04. Both are played with the JW Player on this site.
- mmcammish control - You can see the feed from McCamish Pavilion when it is playing. We hope to live caption ceremonies held here.This stream uses the VidiU encoder and streams through wow04 before it is played by the JW Player on this ste.
- i video - You can see the feed from GoCoder, a wowza live streaming phone application, when it is running. This stream plays from a phone, is served from wow04 and played by the JW Player on this site. You should be able to download GoCoder onto your IPhone or Android phone and experment with live streaming if you have a streaming account on wow04.
- VOD w/captions - You can see a video on demand served from wow04 with captions also served from wow04 and played by the JW Player on this site. The Wowza server and JW Player work the magic of combining them and making them available. When we figure out how to allow DMI users to upload a same-named *.vtt file to the same directory as the video it is subtitling then we will have a way to caption any video on demand that is loaded into DMI. Wowza on the production DMI servers would need to be updated to make this possible.
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Adding Closed Captions:
JW Player 7 supports the rendering of closed captions or subtitles in the video display. These captions can be selected by viewers through the CC button. Here is an example, using a single language. The CC button then acts as a toggle:
For multiple languages, the CC button will show a language selection menu. Click here to load multiple languages for above example video (or toggle back to single CC).
- JW Player 7 currently supports captions in two formats:
- WebVTT, a plain text format that's part of the HTML5 standard.
- VTT is required to render tracks on iOS Fullscreen
- SRT, a plain text format that's popular amongst file sharers.
- VTT captions are strongly preferred, since they are part of the HTML5 standard and will work across more browsers (Namely iOS in full screen). JW Player supports both formats in non-fullscreen in both Flash and HTML5 modes. As of JW 7.3, playback in fullscreen on iOS can be accomplished when using VTT captions. The player will intelligently attach a VTT track element when Safari is detected.
- JW Player also supports captions embedded in the stream for HTTP Live Streaming.
- CEA-608 Captions
- The JW Player will detect and display CEA-608 captions that were injected into H264 SEI messages of an HTTP Live Streams. These captions can be turned on or off with the normal closed captions toggle. The detection of CEA-608 captions is available in the Premium edition of the JW Player.
- JW Player 7 currently supports captions in two formats:
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