OMwiki:Tech
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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. | ||
- | + | *Google Chrome won't start playback w/ installed version of oggz-chop (affects anything in stream view). This is a temporary problem. | |
- | *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. | *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. |
Revision as of 15:04, 7 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. - 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 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.
- Draft a script to import MetaVidWiki clips from apps that can produce .srt or .cmml captions (e.g., Gnome Subtitles)
Dreamlist
Minor things
- USB headsets crash spontaneously (error message
usb_set_interface failed
in 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