I envision this as combination of two parts:
- * powerful editing suite running locally to annotate video
+ * powerful video editing suite running locally with annotations
* good web interface with sync between slides and video
1. video file in Ogg Theora format
2. pdf file with slides of presentation
+ 3. create html file with meta-data
-all other meta-data should be stored in git under media/
+All of this is stored under media in directory conference-lecture.
If you have different file formats, go ahead and use ffmpeg2theora:
on the web, oggz tool has chop support, so extracting part of video is
very easy and possible.
+When re-encoding video materials following command line gives more-or-less
+resonable video size while inserting keyframes for nice seek:
+
+ ffmpeg2theora -p padma --keyint 1 source_video.flv
+
VIDEO EDITING
-I really don't want to learn another set of tools. I like mplayer,
-it works on all platforms I'm interested in (including EeePC and
-PlayStation 3) and i all-ready know keyboard shortcuts for it.
+I like mplayer, and lerning another set of tools to do video editing
+didn't make sense to me.
+
+It works on all platforms I'm interested in (including EeePC and
+PlayStation 3) and I know keyboard shortcuts for it.
So, I used it over it's slave protocol which is described on
: $1 eq 'F2' ? move_subtitle( -0.3 )
: $1 eq 'F3' ? move_subtitle( +0.3 )
: $1 eq 'F4' ? next_subtitle
+ : $1 eq 'F5' ? save_subtitles
: $1 eq 'F9' ? add_subtitle
: $1 eq 'F12' ? edit_subtitles
: warn "CUSTOM $1\n"
;
I used to work with semi-professional Sony U-matic video montage back in 1990
-and have grown to love it's work flow which doesn't force you to click
+and have grown to love it's workflow which doesn't force you to click
all over the screen to do something useful.
-In fact, with it, you need 3-5 times more time to finish material,
+In fact, with this tool, I need 3-5 times more time to finish material,
and with most video editing solutions available in open source,
I needed at least 10-20 times more time to do anything useful.
Effective subtitle editing requires preroll. This is feature from my U-matic days
because scopes (U-matic video recorders with magnetic tape) couldn't speed up
-instantly, so they would rewind, start AND SHOW YOU FEW SECONDS BEFORE YOUR EDIT.
+instantly, so they would rewind, and than start FEW SECONDS BEFORE your edit point.
-This is crucial part in implementing following work flow with mplayer:
+This was crucial concept for implementing the following workflow with mplayer:
1. press i to record EDL point (start of subtitle)
2. press i to end EDL (end of subtitle)
3. press , to enter subtitle (usually you want to enter subtitle after end of sentence)
- 4. preroll 3 seconds before subtitle and review it
+ 4. mplayer will preroll 3 seconds before subtitle and review it
5. continue subtitling, goto 1
You can also use F9 to add subtitle (nicely located near i key) or F12 to enter vi
which triggers switch to slide 42.
+In presentations which are created using Takahashi method (lot of slides with
+transitions which follow speaker) you might use just add subtitle to mark
+transition to next slide.
+
HTML5 WEB INTERFACE
Web interface using HTML5 <video> tag based on work from BBC R&D TV
-http://open.bbc.co.uk/rad/demos/html5/rdtv/episode2/index.html
+ http://open.bbc.co.uk/rad/demos/html5/rdtv/episode2/index.html
+
+ http://www.bbc.co.uk/blogs/rad/2009/08/html5.html
-http://www.bbc.co.uk/blogs/rad/2009/08/html5.html
+Which in turn is based on jCarousel from
+ http://sorgalla.com/projects/jcarousel/
I removed most of nice design, added support for slides and made it
scale to accomodate different resolutions of video materials.
+Additional media info (author, title, location, date) is kept in hcalendar.html
+using microformat which defines classes. For more info about hCalendar see
+
+ http://microformats.org/wiki/hcalendar-cheatsheet
+
+
TRY IT OUT
Create media/conference-title/www file with source urls for video and presentation
+ # install dependecies from Debian packages
+ $ sudo bin/install-debian.sh
+
$ cd media/conference-title
$ wget -nc -i www
- # set default video
- $ ln -s 20090704183304_dobrica.mts.ogv video.ogv
+ # create metadata
+ $ vi hCalendar.html
# generate hires slide jpegs using ghostscript
$ ./bin/slides-hires.sh media/conference-title/presentation.pdf
- # setup interface
- $ cd www
- $ ln -sf ../media/conference-title media
- $ cd -
-
# annotate some material
- $ ./bin/mplayer.pl
+ $ ./bin/mplayer.pl media/conference-Title/video.ogv
+
+After adding first slide you will get visual overview of all slides
+which is useful when typing in slide markers [42] in subtitles.
- # resize presentation and show montage preview
- $ ./bin/slides-resize.sh
+When slide reisze finish, you might want to open http://localhost/html5tv/www/_editing.html
+in Firefox (you will have to open it through http server!) and check final result.
-You will probably want to run resize after you made first annotation in mplayer
-because you will get visual overview of all available slides which is useful
-when typing in slide markers [42] in subtitles.
+MULTI MONITOR SETUP
-When slide reisze finish, you might want to open http://localhost/html5tv/www/tv.html
-in Firefox and check final result.
+I'm using awesome as window manager, and since HTML5TV uses xdotool to focus between terminal
+to enter subtitle and mplayer, it will switch to same virtual desktop on *both* monitors,
+so it's helpful to start ./bin/mplayer.pl on same virtual desktop at least with awesome.
projects / HTML5TV.git / blobdiff