[Ffmpeg-devel] [PATCH] configure.c: CONFIG_ENCODERS

[Michael Niedermayer]

Hi

On Saturday 07 May 2005 23:00, M?ns Rullg?rd wrote:
> "Fran?ois Revol" <revol at free.fr> writes:
> >> Rich Felker <dalias at aerifal.cx> writes:
> >> > On Sat, May 07, 2005 at 09:32:20PM +0200, Roine Gustafsson wrote:
> >> >> On May 7, 2005, at 8:19 PM, M?ns Rullg?rd wrote:
> >> >> >Roine Gustafsson <roine at users.sourceforge.net> writes:
> >> >> >>Patch sets CONFIG_ENCODERS and CONFIG_DECODERS depending on
> >> >> >>
> >> > > > > wether the
> >> >> >>
> >> >> >>user has added any encoders or decoders.
> >> >> >>The idea is to use CONFIG_[EN|DE]CODERS for libavformat and use
> >> >> >>CONFIG_<x>_[EN|DE]CODER for libavcodec.
> >> >> >>Then libavformat would have no 'encoders' (muxers) if libavcodec
> >> >> >>
> >> > > > > has
> >> >> >>
> >> >> >>no encoders at all.
> >> >> >
> >> >> >You might still want the ability to mux streams from other
> >> >> >encoders, or copied from the input.
> >> >>
> >> >> You might have misunderstood: If there are ANY decoders, it will
> >> >> enable ALL demuxers, and similar for encoders.
> >> >
> >> > Yes, this is wrong. There's no reason you need decoders to use
> >> > demuxers, and no reason you need encoders to use muxers.
> >>
> >> The requirement of decoders for demuxers is a design flaw in
> >> libavformat.  Fixing it now will not be easy.
> >
> > The requirement of containers to parse encoded data to retrieve basic
> > infos such as frame rate is a design flaw in those containers (see NSV
> > and many others). Do you plan on fixing the file format themselves too?
>
> A file format is broken, if parsing the file depends on the contained
> data.  This is not the same as allowing the container to omit some
> information that the decoder can fill in later.

a file format is IMO broken if it cannot be converted to most general purpose 
multimedia formats without decoding or parsing the individual streams

-- 
Michael

"nothing is evil in the beginning. Even Sauron was not so." -- Elrond