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Editing OMwiki:Tech

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Please see: http://meta.wikimedia.org/wiki/OpenMeetings.org
Message updated 29-March-2013 by GChriss

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__NOTOC__
__NOTOC__
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==Recording devices==
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==Video capture==
===Known issues===
===Known issues===
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*Fixup non-compliment DV hardware + firewire-core [https://bugzilla.redhat.com/show_bug.cgi?id=449252 Example ticket]
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*Fix or forgo non-compliment DV hardware.  [https://bugzilla.redhat.com/show_bug.cgi?id=449252 Example ticket]
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===To-do===
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===Possibly fixable===
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*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]
*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]
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*Investigate audio ground loops and prevention techniques
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*Document rendering options on other video editors (''e.g.'', [http://www.xiph.org/quicktime/ XiphQT]).
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===Dreamlist===
===Dreamlist===
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*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.
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*Build open-firmware cameras that record directly to Ogg (2-pass Theora+Vorbis); also include simplified on-camera editing.  Elphel has completely-open [http://www3.elphel.com/353_turnkey network cameras], but audio capture and across-the-room zooming might not be implemented.
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*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.
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*Auto-balancing, wireless, golfball-sized mics that are mutable by the camera.  Best for when push-to-talk mics are not available.
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*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.
*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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<br>
<br>
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==Editing==
==Editing==
===Known issues===
===Known issues===
*[http://cinelerra.org/ Cinelerra-CV] is buggy and somewhat dated.  Wait for Lumiera to mature.
*[http://cinelerra.org/ Cinelerra-CV] is buggy and somewhat dated.  Wait for Lumiera to mature.
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===Possibly fixable===
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===To-do===
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*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.]
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*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 support as per [http://web.mit.edu/xiphmont/Public/theora/demo8.html xiphmont's lead.]
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*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.
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*Find a plugin/filter that syncronizes audio captured from a secondary source; slight a/v sync drifts accumulate over time, making 2nd-track audio recombination non-viable.
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*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.
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*Document export options to accomidate a wider range of video editors; [http://php.scripts.psu.edu/gsc127/blogs/2009/05/firefox-ogg-firefogg-demo.php firefogg] is an option.
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===Dreamlist===
===Dreamlist===
*Theora encoding ''via'' hardware acceleration (TI C64x+ DSP or an Elphel card?)
*Theora encoding ''via'' hardware acceleration (TI C64x+ DSP or an Elphel card?)
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==Archiving==
==Archiving==
===Known issues===
===Known issues===
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*FTP on the Internet Archive is only available for item download and initial upload; item editing is browser-based.
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*FTP is only available for item download and initial upload; item editing is browser-based.
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*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.
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*OpenMeetings.org is not crawled by the Wayback Machine.
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===To-do===
===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.
*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.
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===Dreamlist===
===Dreamlist===
*Implement template support on the [http://archive.org Internet Archive] description pages.
*Implement template support on the [http://archive.org Internet Archive] description pages.
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*Secure logins + strong item deletion-prevention.
 
<br>
<br>
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==Distribution==
==Distribution==
===Known issues===
===Known issues===
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*Forgo Media RSS ver. 1.5.0 and start on a sensible ver. 1.6.  Ver 1.4 is OK.
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*Abandon Media RSS ver. 1.5.0 and start on a sensible ver. 1.6.  Ver 1.4 is OK.
===To-do===
===To-do===
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*Implement content delivery network, which will involve site migration.
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*Figure out a content delivery network and targeted areas.
===Dreamlist===
===Dreamlist===
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===Known 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.
*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.
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*Google Chrome has buggy Theora support.
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*Google Chrome won't start playback w/ installed version of oggz-chop (affects anything in stream view).  This is a temporary problem.
*Edit [[MediaWiki:Common.js]] to download animated gifs only [[OMwiki:Finding_aid|when 'show' is clicked]] to avoid long page loads.
*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.
*[[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)
*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)
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*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.
 
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===To-do===
===To-do===
*Add a Vorbis-only option on video streams for low-bandwidth connections.
*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.
*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.
*Figure out AJAX auto-complete magic.
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*Fix Google search listing.
 
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*Start up project blogging, @openmeetings.org email addresses, and listing of similar projects.
 
===Dreamlist===
===Dreamlist===
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===To-do===
===To-do===
*Figure out best options to breakdown tons of video.
*Figure out best options to breakdown tons of video.
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*Fixup and advertise availability of [[OMwiki:Nodes|echo.openmeetings.org]] for compute tasks.
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*Fixup and advertise availability of [http://echo.openmeetings.org:8080 echo.openmeetings.org] for compute tasks.
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*Machine synchronization of known-good transcripts to video (i.e., match individual words to the exact timecode spoken).
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===Dreamlist===
===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).
*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).
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*Have individuals appear as virtual avatars in-video (''i.e.'', Second Life or Avatar-esque), according to user preference.
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*Have individuals appear as virtual avatars in-video (''i.e.'', Second Life-esque), according to user preference.
<br>
<br>
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==External apps/reuse==
==External apps/reuse==
===Known issues===
===Known issues===
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*ffmpeg/mplayer seems to handle duplicate Theora frames poorly, breaking A/V sync and thus limiting video reuse.  Submit bug report.
*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])
*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])
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*Figure out a easy way to integrate playback with blog platforms, including various commenting systems (''i.e.'', plugins).  [http://www.personal.psu.edu/gsc127/blogs/2009/06/enabling-video-content-on-your.html Known hacks]
 
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===Dreamlist===
===Dreamlist===

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