[FFmpeg-devel] support multipage TIFFs
Wed Aug 12 14:32:22 CEST 2009
On Tue, Aug 11, 2009 at 02:40:32PM +0200, Michael Niedermayer wrote:
> On Mon, Aug 10, 2009 at 06:14:12PM -0400, Justin Ruggles wrote:
> > Justin Ruggles wrote:
> > > Michael Niedermayer wrote:
> > >
> > >> On Sun, Aug 09, 2009 at 05:56:39PM +1000, Peter Ross wrote:
> > >>> $subject.
> > >> what are multipage tiffs?
> > >> are the individual tiffs frames of a video or could they be considered
> > >> seperate?
> > >> if a video, can they be seperated by a parser
> > >> if not, is avpkt.pts/dts reset appropriately?
> > >
> > > The only use I've seen is for documents. We have a
> > > copier/printer/scanner at work that will scan a document as a multipage
> > > TIFF and email it. It also does PDF, which is what we normally use, but
> > > the TIFF option is there too.
> > Come to think of it, I have seen another use. I believe that some (but
> > not all) raw digital camera TIFF-derivative formats use the multipage
> > feature for thumbnail(s).
> and thumbnails dont belong in the same AVStream as the vifdeo because they
> are not just another frame of the video
Reduced resolution images (such as thumbnails) are specially flagged using
the NewSubFile ttag. A multi-page decoder should filter these out...
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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