Bounties: Difference between revisions

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These are proposed bounty projects, similar to http://gnome.org/bounties/
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or the [http://ghostscript.com/article/58.html Ghostscript bug bounty] program.
We don't have the same level of funding but could start a pot with $10-$100 and
let people contribute to specific bounties through paypal.


It would be helpful to list $ amounts which have been donated for each bounty, even if the foundation hasn't decided how much extra (if any) to allocate. --Tesseract


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=== OggVorbis 5.1 ===
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5.1 Sound encoding in Ogg Vorbis.
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There are two steps here. Simple coupling and lowpass for the .1 channel, and a full set of tuned modes.
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They should be separate bounties.


:This should be implemented with ambisonics as the internally coupled channels, and then use ambisonic g-format filters for en/dec coding from and to 5.1. This will allow correct playback on many different speaker layouts and an easy path to headphone support.  
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=== Xiph Quicktime Plugin ===
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[http://www.xiph.org/quicktime/ QuickTime Components] is now a project hosted on xiph.org.
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You have to write a Quicktime Plugin for the Ogg container and the Xiph Codec Family.
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[http://qtcomponents.sf.net qtcomponents] provides support for Ogg Vorbis and MNG. This could be used as start.
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Xiph Quicktime Plugin has to support encoding/decoding for:
* Ogg Media container
**[http://qtcomponents.sf.net qtcomponents] ''has an operational pluggable API for import, it needs some work to be long term supportable.  It does not have a pluggable API for exporting at this time.''
* Support for Chained Ogg Streams
**[http://qtcomponents.sf.net qtcomponents] ''imports chained files as multiple tracks in QuickTime.  It does not create chained files during export.''
* Support for Icecast Streams (sending is optional)
**[http://qtcomponents.sf.net qtcomponents] ''implements nothing towards this item.  First up is a reverse-engineering effort, as the specifications for a streaming media handler have not been published.''
* Support for Xiph Codec Family: Vorbis, Theora, FLAC, Speex, Writ
**[http://qtcomponents.sf.net qtcomponents] ''has code for Vorbis and Speex (not working at the moment) and there is code at [http://damien.drix.free.fr/qtflac/ Damien Drix's site] for FLAC (decode only).''
It must also be possible to use the Xiph codecs in .mov files in combination with other quicktime codecs.
*[http://qtcomponents.sf.net qtcomponents] ''supports embedding media encoded with Xiph codes into .mov files.''
The plugin should work with at least QuickTime 6.x and 7.x on Mac OS X and Windows. (Mac OS 9 would be nice but probably isn't as important.)


All work must be released under the GPL.
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=== Aggressive low-bitrate libvorbis encoding improvements for Vorbis I ===
<p>libvorbis has a lot of room for improvement in all quality/bitrate departments, particularly at the lower quality levels / bitrates.  There are many directions to approach this problem from.</p>
To claim this bounty, the following criteria would have to be met:
* A 25%-or-better reduction in bitrate for quality levels -1, 0, 1 on a reasonable testsuite while maintaining qualitative equivilence (or improvement) in community testing.
* No overall qualitative/bitrate regressions in quality levels 2 upwards
* Output ogg files compatible with Vorbis I spec
* Changes under suitable license for re-integration with Xiph.Org libvorbis
 
 
 
=== iPod playback support ===
The [http://ipodlinux.sourceforge.net/ Linux on iPod] project has vorbis decode working (with alternate firmware) at a good fraction of realtime. It should be a small matter of optimization to get it working
for useful playback.
 
=== FLAC support in libfishsound ===
[http://annodex.net/software/libfishsound/ libfishsound] currently only supports Ogg Vorbis and Ogg Speex. It should be extended to support FLAC to complete the set of Xiph audio codecs.
 
=== Ogg Vorbis Bitrate Peeling ===
:Note: a bounty for this project has been posted on [https://launchpad.net/ launchpad.net]: [https://launchpad.net/bounties/ogg-vorbis-bitrate-peeling  Add bitrate peeling to the standard libvorbis encoding library].
<p>Ogg Vorbis bitrate peeling has been a topic brought up time and again to combat MP3 enthusiasts. But this feature does not actually exist, only the mere possibility abounds. This bounty is set to change that.</p>
The peeler must meet the following criteria:
* Any Vorbis stream can be converted (not transcoded) to a lower quality setting
* Resulting streams would be identical or nearly identical to a stream generated by encoding the original source to the selected quality
* This process is reasonably fast (that is, signifigantly faster than re-encoding from source)
The following must also be accomplished to claim this bounty:
* The encoding libraries must be updated to create <em>peelable</em> Vorbis streams natively
* Old Vorbis streams must be <em>peelable</em> already, or convertable with a utility in order to be made <em>peelable</em>
* If older streams are not natively <em>peelable</em>, old <em>unpeelable</em> Vorbis streams must be identifiable and discernable from <em>peelable</em> streams in such a way as to facilitate transcoding streams from the old format
* All work submitted must be licenced under a BSD style licence (excepting circumstances where other licences may conflict)

Revision as of 08:36, 4 July 2006


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