[FFmpeg-devel] Fork and customize ffmpeg

Bui Phuc Duyet (Francesc) francesc.zuyet at gmail.com
Fri Aug 30 03:57:05 CEST 2013

Thank you Clement, for my research I have to hack into the internal rather
than simply writing a filter on image: I ought to output a modified
Intra-frame only rather than modifying other interpolated frames to save
computations. I doubt it is inside libavcodec, first thing, for simplicity,
MPEG/MP4 needs modifying only, but I don't know where to start.

2013/8/30 Clément Bœsch <u at pkh.me>

> On Thu, Aug 29, 2013 at 11:24:01PM +0800, Bui Phuc Duyet (Francesc) wrote:
> > Hi FFMpeg developers,
> >
> > First, I'd like to be sorry if my email may contain non-technical terms
> > because I'm a student doing some research on FFMpeg.
> >
> > My final year research is about energy-efficient video, in which it
> should
> > output a color-mapped [I] frame (in MPEG, MP4) rather than the original
> > output. The colormapping (alternating the output frame's color) should be
> > done in ffmpeg's function (may it be avcodec_decode_video2?).
> >
> Do you need access to mpeg video decoding internals, or you can do your
> operation based on the video images only? If you need access to mpeg
> internals, hack into the mpeg decoder (see libavcodec), otherwise, just
> write a filter (libavfilter). MP4 is the container, I doubt you'll need
> that for what you want, but it's located in libavformat.
> > Because I am such a beginner and use ffmpeg as source for research, may
> you
> > suggest a developer guide on how ffmpeg is structured, and how to tackle
> > the output problem as I mentioned?
> >
> http://ffmpeg.org/ffmpeg.html#Detailed-description
> This summarizes pretty well where things are. Then git grep is your
> friend.
> [...]
> --
> Clément B.
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