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commit a8c7afa7d778cefec08f781ef5bcc09c640161fb Author: Diego de Souza <[email protected]> AuthorDate: Fri Jul 10 18:18:33 2026 +0200 Commit: Niklas Haas <[email protected]> CommitDate: Wed Aug 26 09:52:59 2026 +0000 avfilter/vf_scale_cuda: use generic filters for Lanczos by default Use the generic weight-LUT path for Lanczos in automatic mode to provide the full filter window and downscaling anti-aliasing. Keep the legacy four-tap path available with use_filters=0. Signed-off-by: Diego de Souza <[email protected]> --- doc/filters.texi | 6 ++++-- libavfilter/vf_scale_cuda.c | 8 ++++++-- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/doc/filters.texi b/doc/filters.texi index 47f27b8a44..488ecdf9c5 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -27689,7 +27689,8 @@ Bicubic This is the default. @item lanczos -Lanczos +High-quality separable Lanczos (windowed sinc). The filter radius can be +set with @option{param}; the default is 3. @end table @@ -27711,7 +27712,8 @@ parameters. This is the default behaviour. If set to 1, filter with a generic weight LUT instead of using fixed-function shader kernels. May be faster or slower depending on the hardware. A value of @code{auto} (the default) enables this automatically when required for -correct anti-aliasing when downscaling. +correct anti-aliasing when downscaling, and for high-quality Lanczos scaling. +Set this to 0 to use the legacy fixed 4-tap Lanczos kernel. @item param Algorithm-specific parameter. For @var{bicubic}, this affects the filter diff --git a/libavfilter/vf_scale_cuda.c b/libavfilter/vf_scale_cuda.c index 9e47659536..747cc624b3 100644 --- a/libavfilter/vf_scale_cuda.c +++ b/libavfilter/vf_scale_cuda.c @@ -540,8 +540,12 @@ static av_cold int init_processing_chain(AVFilterContext *ctx, int in_width, int } else if (s->use_filters_opt >= 0) { s->use_filters = s->use_filters_opt; } else { - s->use_filters = cudascale_plane_is_downscaled(in_width, out_width, - 0, 0) || + /* Lanczos needs the generic path for its full windowed-sinc + * kernel. Other algorithms need it when downscaling for correct + * anti-aliasing. */ + s->use_filters = s->interp_algo == INTERP_ALGO_LANCZOS || + cudascale_plane_is_downscaled(in_width, out_width, + 0, 0) || cudascale_plane_is_downscaled(in_height, out_height, 0, 0) || (s->in_planes > 1 && s->out_planes > 1 && -- To stop receiving notification emails like this one, please contact [email protected]. _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
