On 6/24/2023 5:46 PM, Tomas Härdin wrote:
lör 2023-06-24 klockan 19:54 +0200 skrev Paul B Mahol:
On Sat, Jun 24, 2023 at 12:53 PM Tomas Härdin <g...@haerdin.se> wrote:
lör 2023-06-10 klockan 20:31 +0200 skrev Michael Niedermayer:
jpeg2000 overrides the global lowres variable with a lowres field
called reduction_factor
ffmpeg -lowres X causes the reduction_factor to be set
ffplay -lowres X causes both lowres and the reduction_factor to
be
set
ossfuss sets only lowres
Why does jpeg2000dec have its own -lowres? Does lavc reset it
somewhere
to where the decoder can't make use of the avctx-level setting?
Libav removed lowres from avctx, but same was not done here.
IMHO lowres is codec-specific thing and only codecs supporting it
should
have private option to change it.
Enough codecs support lowres that marking support for it in codec caps
may be worthwhile. Something to consider for the future.
There's AVCodec.max_lowres, which when not zero it means the decoder
supports lowres.
/Tomas
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