FFmpeg Summer Of Code 2008: Difference between revisions

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=== Freeform Tasks ===
=== Freeform Tasks ===
If you have an idea for a simple task, come and discuss in on the [https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel development mailing list] and the devs might approve it.
If you have an idea for a simple task, come and discuss it on the [https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel development mailing list] and the devs might approve it.

Revision as of 13:10, 23 February 2008

This is a page to discuss possible project ideas for the Google Summer of Code 2008 season, just in case Google decides to host it and accept FFmpeg as a project again.

Current Status

  • February 20, 2008: Created page

Application Process

The student application process for 2008 will be as rigorous, if not more so, than in 2007.

Project Proposals

DTS Encoder

Mentor: Benjamin Larsson

Nellymoser encoder

Mentor: Benjamin Larsson

AAC-LC encoder

  • Sample files: http://samples.mplayerhq.hu/A-codecs/AAC/
  • Qualification: Quicktime IMA ADPCM encoder
  • Prerequisite: Filterbanks (Sigsys)
  • Clearly defined task
  • Primary goal: Dumb bitstream compatible encoder with flexible framework for a serious psychoacoustic implementation

Mentor: Benjamin Larsson

Better handling of audio in libavcodec

LGPL reimplementation of GPL sws_scale parts

  • Loosly defined task
  • Primary goal: LGPL licensed sws_scale
  • Secondary goal: removal of lavc scaler

Qualification Tasks

Many students apply for the Google Summer of Code and wish to work on a sexy multimedia project such as FFmpeg. All students will claim to be hard workers but we need a method of determining which students have a higher probability for success. Thus, we developed the qualification system during the 2007 season and will be enforcing the same system this year. A student must successfully complete a qualification task in order to be considered for an FFmpeg SoC project. In doing so, a student demonstrates that they:

  • were willing to commit some time during the Summer of Code application review period in order to prove themselves
  • can code C satisfactorily and with the same general style expected of the FFmpeg codebase
  • can wrap their head around the code base
  • can interact with the FFmpeg development mailing list
  • can accept feedback and revise the code until it is suitable for inclusion in the main code base

Frequent Objection #1: But I don't have time to do a qualification task! Then how do we know you will have time to work on your task during the summer? The qualification tasks are selected to be fairly trivial by FFmpeg standards and should not be too difficult for a prospective FFmpeg contributor. If they are too difficult, maybe FFmpeg is not the project for you. Also, be encouraged by the fact that the app review period comes after the application submission deadline; i.e., you can work on a qualification task after you submit an application for FFmpeg. But you will not be considered for an SoC project slot unless you have satisfactorily completed a qualification task.

Cleanup of MLP decoder

This task involves adding a decoder to FFmpeg to play MLP audio data. The hard work has already been done; now a volunteer needs to take the existing decoder patch and make it satisfactory for inclusion into the codebase. MLP samples referenced from the MLP Wiki page.

Latest version of the MLP patch: http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2008-January/040234.html

And the comments: http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2008-January/040251.html

Support PB frame mode for H.263i

Details are in the issue tracker: http://roundup.mplayerhq.hu/roundup/ffmpeg/issue27

Patch cleanup for MPEG 1 & 2 optimizations

Details are in the issue tracker: http://roundup.mplayerhq.hu/roundup/ffmpeg/issue100

Implement a Vivo demuxer for FFmpeg

Implement an FFmpeg demuxer for the Vivo file format. The best reference for understanding the format would be MPlayer's existing .viv demuxer.

This task corresponds to issue 99: http://roundup.mplayerhq.hu/roundup/ffmpeg/issue99

Optimal Huffman tables for (M)JPEG

This task is outlined at http://guru.multimedia.cx/small-tasks-for-ffmpeg/ and is tracked in the issue tracker: http://roundup.mplayerhq.hu/roundup/ffmpeg/issue267

RL2 Playback System

This task is to implement an FFmpeg playback subsystem for RL2 files. This will entail writing a new file demuxer and video decoder (the audio is already uncompressed), both of which are trivial by FFmpeg standards. The RL2 page contains the specs necessary to complete this task and points to downloadable samples.

YOP Playback System

This task is to implement an FFmpeg playback subsystem for Psygnosis YOP files. This will entail writing a new file demuxer and video decoder, both of which are trivial by FFmpeg standards. The Psygnosis YOP page contains the specs necessary to complete this task and points to downloadable samples.

BFI Playback System

This task is to implement an FFmpeg playback subsystem for BFI files. This will entail writing a new file demuxer and video decoder (the audio is already uncompressed), both of which are trivial by FFmpeg standards. The BFI page contains the specs necessary to complete this task and points to downloadable samples.

Legacy Tasks

Many tasks were suggested during the 2007 season. Any task that is not marked as completed is probably fair game, but ask on the list, just to be sure: http://wiki.multimedia.cx/index.php?title=FFmpeg_Summer_Of_Code_2007#Qualification_tasks

Freeform Tasks

If you have an idea for a simple task, come and discuss it on the development mailing list and the devs might approve it.