FFmpeg Summer Of Code 2007: Difference between revisions
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=== MPEG TS/DVB Muxer === | === MPEG TS/DVB Muxer === | ||
* Specification: ISO 13818-1 | |||
=== PAFF decoding for H.264/AVC === | === PAFF decoding for H.264/AVC === |
Revision as of 12:10, 8 March 2007
Google is sponsoring their third annual Summer of Code for the summer of 2007. This entails sponsoring students to work on assorted open source projects as well as sponsoring mentors in those same projects. Everyone wins.
FFmpeg was a Summer of Code participant in the summer of 2006 (here is the corresponding Wiki page) and hopes to be accepted again this year.
Mike Melanson (mike -at- multimedia.cx) is the administrator and main point of contact for matters relating to the FFmpeg Summer of Code.
How to apply
Before you can apply make sure you are qualified enough to apply. Last year 50% of the applicants weren't qualified for the task they applied for.
- You have to know how to program in C fairly well.
- We would like you to submit a patch that fixes a bug or adds a feature to FFmpeg. By doing that we will know that you are qualified for the task or not. On this page there is a list of Small Tasks that can be done. But you are free to submit anything you feel might be of value to FFmpeg.
- Submit a good application through the formal Google Summer of Code process during the application timeframe (March 14-24, 2007).
Current Status
- March 5-12, 2007: Application period for mentoring organizations.
- March 6, 2007: Mike Melanson submitted FFmpeg mentoring application.
Waiting for acceptance...
Project Proposals
Overview
Qualifications for a good Summer of Code proposal:
- discrete, well-defined, modular
- comprised of a series of measurable sub-goals
- based on open specs that are available free of charge
- based on complete specs
An example of a good proposal is the implementation of a decoder or demuxer for an as yet unsupported multimedia format, or an encoder or muxer for a format that can already be demuxed/decoded by FFmpeg.
An example of a less desirable proposal is one that's not as measurable, such as refactoring APIs. Bad proposals tend to be ones that would require touching a lot of core code.
To re-iterate:
- Localized/isolated code projects = good
- Global code refactoring = bad
JPEG2000
- Specifications: As ITU-T recommendations, ISO publicly available standards
- Sources: JasPer, OpenJpeg, JJ2000 (in Java)
- Samples: http://samples.mplayerhq.hu/jpeg2000/
Monkey's Audio Decoder
- Sources: original sources, original sources port for non-win32 platforms, LGPLed Java implementation
QCELP Decoder
- Specification: QCELP decoder spec is c.s0020 and source is c.r0020
- Sample files: http://samples.mplayerhq.hu/A-codecs/qclp/
Mentor: Benjamin Larsson
E-AC3 Decoder
- Specification: http://www.atsc.org/standards/a_52b.pdf
- Samples: http://samples.mplayerhq.hu/evob/MAININTRO.EVO
GSM Decoder
- Specification + sample implementation: http://kbs.cs.tu-berlin.de/~jutta/toast.html
- Samples: http://samples.mplayerhq.hu/A-codecs/GSM/
Dirac Decoder
Dirac Encoder
i263 Decoder
- Specification: I263 Format Specification at MultimediaWiki
- Sources: GPLed I263 decoder
- Sample files: http://samples.mplayerhq.hu/V-codecs/I263/
VP6 Encoder
- Specification: On2 VP6
- Samples: http://samples.mplayerhq.hu/V-codecs/VP6/
NUT Muxer
Matroska Muxer
- Specification: http://www.matroska.org/technical/specs/index.html
- Sample files: http://samples.mplayerhq.hu/Matroska/
Mentor: Aurelien Jacobs; Backup mentors: Steve Lhomme, Ronald S. Bultje
MPEG TS/DVB Muxer
- Specification: ISO 13818-1
PAFF decoding for H.264/AVC
- Specification: ITU-T
- Sample files: http://samples.mplayerhq.hu/V-codecs/h264/PAFF/
MXF Muxer
RV30/RV40 decoders
(contingent on near-term reverse engineering efforts)
Small tasks
Optimize some code
Do you think some code in ffmpeg could run faster? We would love to get some faster decoders or encoders.
This requires some ASM skills and using timer code to benchmark.
Speedups needed in:
- h264 decoder
- vc-1 decoder