[FFmpeg-devel] [PATCH]Add an image3 demuxer with format?autodetection

Michael Niedermayer michaelni at gmx.at
Wed Jun 25 01:25:28 CEST 2014

On Tue, Jun 24, 2014 at 10:54:13PM +0000, Carl Eugen Hoyos wrote:
> Michael Niedermayer <michaelni <at> gmx.at> writes:
> > > > ./ffmpeg -i tests/lena.pnm -f image2 -vcodec png out
> > > > cat out out out|./ffmpeg -i -
> > > 
> > > I agree but isn't this impossible because of ticket #3687?
> > 
> > for bmp, no pipe variant would work reliable neither image2, 
> > image3 nor with or without individual AVInputFormats
> Agree.
> > in practice that would probably be dealt with by not 
> > autodetecting bmppipe, the user still can specify it with 
> > -f bmppipe and maybe he is lucky and his images work with 
> > the bmp parser
> > -f image2/3pipe wouldnt really help here or did you mean 
> > something else ?
> With my patch, bmps can be auto-detected and -f image2pipe 
> can auto-detect the image codec.
> I think the code to autodetect pngs as pngpipe but let the 

> user decide if he wants bmps autodetected or not will look 
> messy (or at least will not be consistent).

there would be a png probe function, a pngpipe probe function a
bmp probe function but no bmppipe probe function
the user could force a specific format like she does for any other
format "-f bmppipe" same as in "-f avi"

most likely the png_probe() and pngpipe_probe() would call a common
function similar to how ac3 and eac3 do it currently

this shouldnt be messy at all

> But all this doesn't matter as long as somebody implements 
> the preferred solution.

do you want to implement it or do you not like it and dont want to ?



Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The educated differ from the uneducated as much as the living from the
dead. -- Aristotle 
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