[FFmpeg-devel] [PATCH] Add demuxers.texi file and document the image2 demuxers.

[Michael Niedermayer]

On Sat, Jan 08, 2011 at 05:42:35PM +0100, Stefano Sabatini wrote:
> On date Thursday 2011-01-06 21:43:55 +0100, Stefano Sabatini encoded:
> > On date Tuesday 2011-01-04 16:06:00 +0100, Stefano Sabatini encoded:
> > > ---
> > >  Makefile          |    6 ++--
> > >  doc/demuxers.texi |   60 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> > >  doc/ffmpeg.texi   |    1 +
> > >  doc/ffplay.texi   |    1 +
> > >  doc/ffprobe.texi  |    1 +
> > >  5 files changed, 66 insertions(+), 3 deletions(-)
> > >  create mode 100644 doc/demuxers.texi
> > 
> > If there are no more comments, I'll double check the patch and I'll
> > commit in few days.
> 
> Updated, I'll apply soon if there are no comments.
> -- 
> FFmpeg = Fundamental & Fascinating Miracolous Portable Empowered Geek

[...]
> @@ -18,4 +18,43 @@ enabled demuxers.
>  
>  The description of some of the currently available demuxers follows.
>  
> + at section image2
> +
> +Image file demuxer.
> +
> +This demuxer reads from a list of image files specified by a pattern.
> +
> +The pattern must contain the string "%d" or "%0 at var{N}d", which

just tried
ffmpeg -f image2 -i double-image.jpg test.png

and it worked


> +specifies the position of the characters representing the seqential
> +number in each filename matched by the pattern. If the form
> +"%d0 at var{N}d" is used, the string representing the number in each
> +filename is 0-padded and @var{N} is the total number of 0-padded
> +digits representing the number. The literal character '%' can be
> +specified in the pattern with the string "%%".
> +

> +The first filename of the sequence of files specified by the pattern
> +must contain a number inclusively contained between 0 and 4, all the
> +following numbers must be sequential.

"current limitation, that we hope will be fixed" could be added in there
somewhere


> +
> +The pattern may contain a suffix which is used to automatically
> +determine the type of image contained in the files, which must be one
> +of the supported image files.
> +
> +For example the pattern "foo-%03d.bmp" will match a sequence of
> +filenames of the form @file{foo-001.bmp}, @file{foo-002.bmp}, ...,
> + at file{foo-010.bmp}, etc.; the pattern "b%%a%%r-%d.jpg" will match a
> +sequence of filenames of the form @file{b%a%r-1.jpg},
> + at file{b%a%r-2.jpg}, ..., @file{b%a%r-10.jpg}, etc.
> +

> +The size and the pixel format of each image must be the same for all
> +the files in the sequence.

Ive not tried but there should be no size, nor pixel format limitation
at least when a scale filter is used, ffmpeg should be able to rescale to a
constant size. I know this worked in the past with other demuxers so it should
work here too but as said ive not tried ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact
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