Editing OMwiki:Tech

__NOTOC__

==Recording devices==
===Known issues===
*Fixup non-compliment DV hardware + firewire-core [https://bugzilla.redhat.com/show_bug.cgi?id=449252 Example ticket]

===Possibly fixable===
*Rework [http://modcopy.sourceforge.net/ modcopy] to avoid mmap calls on JFFS2 filesystems (''e.g.'', the OLPC-XO).  [http://sourceforge.net/apps/trac/modcopy/ticket/9 Ticket]
*Investigate audio ground loops and prevention techniques

===Dreamlist===
*Find a portable camera or device that records footage from ''two'' audio sources (''e.g.'', XRL mic + ambient mic) time-synchronized to a video track.
*Migrate to open-firmware cameras that record directly to Ogg; also include simplified on-camera editing.  Elphel has completely-open [http://www3.elphel.com/353_turnkey network cameras] supported by the [http://cinema.elphel.com/ Apertus] community.
*Auto-balancing, wireless, golfball-sized mics that are mutable by the camera.  Best for when push-to-talk mics are not available.
*Have cameras set to blur-out individuals broadcasting a 'do not record my voice, person, or both' flag ''via'' iPhones, RFID, or colored stickers as mentioned in Yochai Benkler's keynote at OVC 2009.

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==Editing==
===Known issues===
*[http://cinelerra.org/ Cinelerra-CV] is buggy and somewhat dated.  Wait for Lumiera to mature.
===Possibly fixable===
*Add YUV4MPEG support in [http://www.blender.org/ Blender] to enable direct output to [http://v2v.cc/~j/ffmpeg2theora/ ffmpeg2theora] ([http://lists.mplayerhq.hu/pipermail/libav-user/2009-March/002639.html email thread]), building upon [[File:Henningsen_7oct2009_blender-svn.tar.bz2|Stephan Henningsen's lead.]]  Also build-in yuv4ogg suFigure out a pport as per [http://web.mit.edu/xiphmont/Public/theora/demo8.html xiphmont's lead.]
*Find a plugin/filter that synchronizes audio captured from a secondary source; slight a/v sync drifts accumulate over time, making 2nd-track audio recombination difficult.
*Document export options to accommodate a wider range of video editors; [http://php.scripts.psu.edu/gsc127/blogs/2009/05/firefox-ogg-firefogg-demo.php firefogg] is an option.

===Dreamlist===
*Theora encoding ''via'' hardware acceleration (TI C64x+ DSP or an Elphel card?)
*Find a sensible audio compressor to avoid the time-intensive task of adjusting audio to comfortable listening levels.


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==Archiving==
===Known issues===
*FTP on the Internet Archive is only available for item download and initial upload; item editing is browser-based.
*Video playback on Internet Archive description pages (inc. <video> fallback) requires the presence of a Flash-based derived file.  These derived files are manually deleted post-upload.
*OpenMeetings.org is not crawled by the Wayback Machine.

===To-do===
*Retool [http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/MetavidWiki/maintenance/download_from_archive_org.php?view=markup download_from_archive_org.php] to work with different source videos and meta tags from the [http://archive.org Internet Archive], using [[OMwiki:Tech/OMwiki-import.php|this wikipage]] as a working draft.

===Dreamlist===
*Implement template support on the [http://archive.org Internet Archive] description pages.
*Secure logins + strong item deletion-prevention.


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==Distribution==
===Known issues===
*Forgo Media RSS ver. 1.5.0 and start on a sensible ver. 1.6.  Ver 1.4 is OK.
===To-do===
*Implement content delivery network, which will involve site migration.
===Dreamlist===


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==OMwiki issues==
===Known issues===
*Find a way to add <code>style="width:352px;"</code> to embed code in 352×240 streams and fix aspect ratio for 352×240 thumbnails when in category view.
*Google Chrome has buggy Theora support.
*Edit [[MediaWiki:Common.js]] to download animated gifs only [[OMwiki:Finding_aid|when 'show' is clicked]] to avoid long page loads.
*[[OMwiki:Speakers|Speaker labels]] work for annotations but not transcripts.

*Search works but has a few issues (punctuation stripped, 'play inline' plays audio although video is paused, search-by-date not yet enabled for all videos)
*White-on-black site design works well for focusing attention on video streams (right?), but fares poorly for text-heavy pages.  Implement an automatic "turn down the lights" feature when video is in a 'play' state.

===To-do===
*Add a Vorbis-only option on video streams for low-bandwidth connections.
*Turn on [http://www.mediawiki.org/wiki/Extension:OpenID OpenID logins.]  Need to figure out how to link non-PEAR libraries to non-recompilable PHP or upgrade web hosting.
*Figure out AJAX auto-complete magic.
*Fix Google search listing.
*Start up project blogging, @openmeetings.org email addresses, and listing of similar projects.

===Dreamlist===
*[http://lists.wikimedia.org/pipermail/metavid-l/2009-August/000055.html Ideas on MetaVid-l] (''e.g.'', [http://identi.ca Identi.ca] integration)
*Replace animated GIFs with low-FPS, enlargeable, jump-to-timecode Theora.  Alternatively, use [http://pad.ma/ Pad.ma]-style mouse-overs (see [https://wiki.pad.ma/browser/padma.dev/padma/static/javascript/info.js?rev=padma.dev%2C354&order=size&desc=1 <nowiki>$(imagePoster).load(function() {...})</nowiki>]).  The thumbnails should cycle through the meeting in large time chunks when non-mouseover'd, and then display clickable frames according the how far the mouse is from the left edge when mouseover'd.  Include ability to pause all animations and step-through lock-step upon mouse clicks.


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==Video post-processing==
===Known issues===
*No video post-processing is implemented.
===To-do===
*Figure out best options to breakdown tons of video.
*Fixup and advertise availability of [[OMwiki:Nodes|echo.openmeetings.org]] for compute tasks.
*Machine synchronization of known-good transcripts to video (i.e., match individual words to the exact timecode spoken).

===Dreamlist===
*Identify a way to output time ranges generated from multi-speaker audio files, with each time range corresponding to the duration of how long a person spoke for ([http://cmusphinx.sourceforge.net/ CMU Sphinx?]).  Hopefully add speaker identification based on the vocal profile, and maybe even facial recognition and emotional categorization (''e.g.'', laughter).
*Have individuals appear as virtual avatars in-video (''i.e.'', Second Life or Avatar-esque), according to user preference.


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==External apps/reuse==
===Known issues===
*Wait for mwEmbed's [http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/js2/mwEmbed/libSequencer/ libSequencer] to mature; squash bugs.
===To-do===
*ffmpeg/mplayer seems to handle duplicate Theora frames poorly, breaking A/V sync and thus limiting video reuse.  Submit bug report.
*Draft a script to import MetaVidWiki clips from apps that can produce [[wikipedia:SubRip|.srt]] or [[wikipedia:Continuous_Media_Markup_Language|.cmml]] captions (''e.g.,'' [http://gnome-subtitles.sourceforge.net/ Gnome Subtitles])
===Dreamlist===


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==Minor things==
*USB headsets crash spontaneously (error message <code>usb_set_interface failed</code> in Debian Squeeze).


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==Communicate:==
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*Have your work recognized on [http://www.sunlightlabs.com/projects/OpenMeetings/ Sunlight Labs: Projects] by contributing code.


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==Non-technical development==
*Please see [[OMwiki:Volunteer]]