[FFmpeg-devel] Seeking api and gsoc

Michael Niedermayer michaelni
Mon Apr 5 18:15:08 CEST 2010

On Mon, Apr 05, 2010 at 12:49:07AM +0200, Michael Chinen wrote:
> Hello,
> I may be interested in participating in GSoC 2010 with ffmpeg.  I hope this
> is the right place to start talking.
> I have noticed the seeking api project idea, and also that it seems to exist
> from a previous year, unfinished.  I could not find info on what the state
> is.  Is there some info page about this?
> I would personally be interested in making sample-accurate seeking available
> for audio.  I realize this is not exactly what the seeking api project is,
> so I wanted to ask what would be acceptable in terms of a project.  Besides
> the basic index-building implementation, I would also be interested in
> implementing a functionality for building a 'probable' index as the file is
> decoded, and an api that lets the client see how likely it is that the guess
> will be valid.  For certain audio files, it may not be possible to quickly
> build an index, but it may be possible to make guesses with increasing
> certainty while the file is decoded from the start position, (for example,
> one might say the file is seekable on a fixed size framerate by noticing the
> frame size doesn't change after the first 10 seconds and we are at
> approximately the right place in the file.)  These are my initial thoughts
> about a GSoC project and I would like to hear how they sound to the ffmpeg
> community.  My scope of personal interest is for audio, but if audio seeking
> alone is not enough for a project, I would submit a project that also
> handles video; however, I think focusing on audio may be ambitious enough
> giving the amount of testing required for the various formats out there.

audio seeking alone certainly is not ok as project.
also exact seeking in pure raw audio only files like mp3 should in theory
alraedy work. That is by linear reading ahead and keeping an index for
the past.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Into a blind darkness they enter who follow after the Ignorance,
they as if into a greater darkness enter who devote themselves
to the Knowledge alone. -- Isha Upanishad
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