OMwiki:Tech
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| - | * | + | ==Video capture== |
| + | ===Known issues=== | ||
| + | *Fix or forgo non-compliment DV hardware. [https://bugzilla.redhat.com/show_bug.cgi?id=449252 Example ticket] | ||
| + | ===To-do=== | ||
| + | *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] | ||
| + | *Document rendering options on other video editors (''e.g.'', [http://www.xiph.org/quicktime/ XiphQT]). | ||
| + | ===Dreamlist=== | ||
| + | *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. | ||
| + | *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. | ||
| - | |||
| - | * | + | <br> |
| + | ==Editing== | ||
| + | ===Known issues=== | ||
| + | *[http://cinelerra.org/ Cinelerra-CV] is buggy and somewhat dated. Wait for Lumiera to mature. | ||
| + | ===To-do=== | ||
| + | *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.] | ||
| + | *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. | ||
| + | *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. | ||
| + | ===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. | ||
| - | |||
| - | + | <br> | |
| - | + | ==Archiving== | |
| - | + | ===Known issues=== | |
| - | == | + | *FTP is only available for item download and initial upload; item editing is browser-based. |
| + | ===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. | ||
| - | + | ===Dreamlist=== | |
| - | * | + | *Implement template support on the [http://archive.org Internet Archive] description pages. |
<br> | <br> | ||
| - | + | ==Distribution== | |
| - | + | ===Known issues=== | |
| - | == | + | *Abandon Media RSS ver. 1.5.0 and start on a sensible ver. 1.6. Ver 1.4 is OK. |
| - | + | ===To-do=== | |
| - | * | + | *Figure out a content delivery network and targeted areas. |
| - | + | ===Dreamlist=== | |
| - | + | ||
| - | + | ||
| - | + | ||
| - | + | ||
| - | * | + | |
<br> | <br> | ||
| + | ==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. | ||
| + | *Video playback might take ~6 seconds to start for timecodes towards the end of the meeting (pending seeking support in [http://www.xiph.org/oggz/ oggz-chop]). | ||
| + | *Google Chrome won't start playback w/ installed version of oggz-chop (affects anything in stream view). | ||
| + | *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) | |
| - | + | ===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. | ||
| + | *Figure out AJAX auto-complete magic. | ||
| - | * | + | ===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>$(imagePoster).load(function() {...})</nowiki>]). The thumbnails should cycle through the meeting in large time chunks when non-mouseover'd, and then display clickable frames according the how far the mouse is from the left edge when mouseover'd. Include ability to pause all animations and step-through lock-step upon mouse clicks. | *Replace animated GIFs with low-FPS, enlargeable, jump-to-timecode Theora. Alternatively, use [http://pad.ma/ Pad.ma]-style mouse-overs (see [https://wiki.pad.ma/browser/padma.dev/padma/static/javascript/info.js?rev=padma.dev%2C354&order=size&desc=1 <nowiki>$(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. | ||
| - | |||
| - | |||
| - | |||
| + | <br> | ||
| + | ==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 [http://echo.openmeetings.org:8080 echo.openmeetings.org] for compute tasks. | ||
| + | ===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). | ||
| + | *Have individuals appear as virtual avatars in-video (''i.e.'', Second Life-esque), according to user preference. | ||
| - | |||
| + | <br> | ||
| + | ==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. | ||
| + | ===Dreamlist=== | ||
| + | *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]) | ||
| - | == | + | <br> |
| - | * | + | ==Minor things== |
| - | + | *USB headsets crash spontaneously (error message <code>usb_set_interface failed</code> in Debian Squeeze). | |
| - | + | ||
| - | + | ||
| - | |||
| + | <br> | ||
==Communicate:== | ==Communicate:== | ||
<!-- *Document and test [https://lists.sourceforge.net/lists/openmeetings-discuss project listserv] [https://lists.sourceforge.net/lists/openmeetings-tech (tech listserv)] --><!-- No need for a new list as of 2009 --> | <!-- *Document and test [https://lists.sourceforge.net/lists/openmeetings-discuss project listserv] [https://lists.sourceforge.net/lists/openmeetings-tech (tech listserv)] --><!-- No need for a new list as of 2009 --> | ||
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<br /> | <br /> | ||
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==Non-technical development== | ==Non-technical development== | ||
*Please see [[OMwiki:Volunteer]] | *Please see [[OMwiki:Volunteer]] | ||
Revision as of 02:07, 5 December 2009
Video capture
Known issues
- Fix or forgo non-compliment DV hardware. Example ticket
To-do
- Rework modcopy to avoid mmap calls on JFFS2 filesystems (e.g., the OLPC-XO). Ticket
- Document rendering options on other video editors (e.g., XiphQT).
Dreamlist
- Build open-firmware cameras that record directly to Ogg (2-pass Theora+Vorbis); also include simplified on-camera editing. Elphel has completely-open network cameras, but audio capture and across-the-room zooming might not be implemented.
- 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.
Editing
Known issues
- Cinelerra-CV is buggy and somewhat dated. Wait for Lumiera to mature.
To-do
- Add YUV4MPEG support in Blender to enable direct output to ffmpeg2theora (email thread), building upon File:Henningsen 7oct2009 blender-svn.tar.bz2 Also build-in yuv4ogg support as per xiphmont's lead.
- 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.
- Document export options to accomidate a wider range of video editors; 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.
Archiving
Known issues
- FTP is only available for item download and initial upload; item editing is browser-based.
To-do
- Retool download_from_archive_org.php to work with different source videos and meta tags from the Internet Archive, using this wikipage as a working draft.
Dreamlist
- Implement template support on the Internet Archive description pages.
Distribution
Known issues
- Abandon Media RSS ver. 1.5.0 and start on a sensible ver. 1.6. Ver 1.4 is OK.
To-do
- Figure out a content delivery network and targeted areas.
Dreamlist
OMwiki issues
Known issues
- Find a way to add
style="width:352px;"to embed code in 352×240 streams and fix aspect ratio for 352×240 thumbnails when in category view. - Video playback might take ~6 seconds to start for timecodes towards the end of the meeting (pending seeking support in oggz-chop).
- Google Chrome won't start playback w/ installed version of oggz-chop (affects anything in stream view).
- Edit MediaWiki:Common.js to download animated gifs only when 'show' is clicked to avoid long page loads.
- 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)
To-do
- Add a Vorbis-only option on video streams for low-bandwidth connections.
- Turn on 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.
Dreamlist
- Ideas on MetaVid-l (e.g., Identi.ca integration)
- Replace animated GIFs with low-FPS, enlargeable, jump-to-timecode Theora. Alternatively, use Pad.ma-style mouse-overs (see $(imagePoster).load(function() {...})). 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.
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 echo.openmeetings.org for compute tasks.
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 (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-esque), according to user preference.
External apps/reuse
Known issues
- Wait for mwEmbed's 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.
Dreamlist
- Draft a script to import MetaVidWiki clips from apps that can produce .srt or .cmml captions (e.g., Gnome Subtitles)
Minor things
- USB headsets crash spontaneously (error message
usb_set_interface failedin Debian Squeeze).
Communicate:
- Join and post to MetaVid-l
- Join #metavid and #mediawiki. No IRC? Click here to join via a webclient.
- Have your work recognized on Sunlight Labs: Projects by contributing code.
Non-technical development
- Please see OMwiki:Volunteer
