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| author | Niklas Haas <git@haasn.dev> | 2025-02-19 22:08:30 +0100 |
|---|---|---|
| committer | Niklas Haas <git@haasn.dev> | 2025-02-27 18:58:19 +0100 |
| commit | 651bfd0dad07b9eb6de6bc810f665f32c4d01865 (patch) | |
| tree | bca6d6472bb0c203cd198cca626c289bdb7793d4 | |
| parent | c85879c6012232e94c8be937ac90f96d0c66176d (diff) | |
| download | ffmpeg-651bfd0dad07b9eb6de6bc810f665f32c4d01865.tar.gz | |
avfilter/vf_libplacebo: set correct alpha mode before blending
&pl_alpha_overlay expects straight alpha, but the alpha output may be
premultiplied as a result of the target alpha mode (or in the absence of an
alpha channel). Fix it by requesting independent alpha explicitly when
blending.
| -rw-r--r-- | libavfilter/vf_libplacebo.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libavfilter/vf_libplacebo.c b/libavfilter/vf_libplacebo.c index 1c494fdc09..0c245cda7f 100644 --- a/libavfilter/vf_libplacebo.c +++ b/libavfilter/vf_libplacebo.c @@ -908,6 +908,9 @@ static int output_frame(AVFilterContext *ctx, int64_t pts) opts->params.skip_caching_single_frame = high_fps; update_crops(ctx, in, &target, out->pts * av_q2d(outlink->time_base)); pl_render_image_mix(in->renderer, &in->mix, &target, &opts->params); + + /* Force straight output and set correct blend mode */ + target.repr.alpha = PL_ALPHA_INDEPENDENT; opts->params.blend_params = &pl_alpha_overlay; #if PL_API_VER >= 346 opts->params.background = opts->params.border = PL_CLEAR_SKIP; |