[FFmpeg-devel] [PATCH] extractplanes filter
nicolas.george at normalesup.org
Fri May 3 12:18:48 CEST 2013
Le tridi 13 floréal, an CCXXI, Paul B Mahol a écrit :
> I wonder how format renegotiation works. I would like to pick 16bit gray
> with right endianess depending on input format - if its 16 bit at all
> otherwise just pick 8bit one.
That would be useful in this situation indeed.
The basic principle is this: query_formats() sets the formats it can, and if
it could not set everything it returns EAGAIN, and will be called again
later, hopefully when more information is available.
In this situation, I believe the correct flow is this:
if input formats are not set
set input formats to all 8 and 16 bits formats
if input formats still contains several bit depths
set output formats to the corresponding gray format
> I can't find where its explained how to do that.
There is a small paragraph in doc/filter_design.txt, it could be expanded,
possibly with an example.
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