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assrender: fix smooth scaling by disabling hinting

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When ass hinting value is set to anything other than NONE,
subtitles cannot use smooth scaling, thus all animations will jitter.

The libass author warns about possibility of breaking some scripts when it is enabled,
so lets do what is recommended and disable it to get the smooth scaling working.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1201>
This commit is contained in:
Rafał Dzięgiel 2020-11-19 18:03:11 +01:00 committed by GStreamer Marge Bot
parent 95c1f67d69
commit c016bed943
1 changed files with 1 additions and 1 deletions
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subprojects/gst-plugins-bad/ext/assrender/gstassrender.c
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@ -923,7 +923,7 @@ gst_ass_render_negotiate (GstAssRender * render, GstCaps * caps)
ass_set_pixel_aspect (render->ass_renderer, ass_set_pixel_aspect (render->ass_renderer,
(gdouble) render->info.par_n / (gdouble) render->info.par_d); (gdouble) render->info.par_n / (gdouble) render->info.par_d);
ass_set_font_scale (render->ass_renderer, 1.0); ass_set_font_scale (render->ass_renderer, 1.0);
ass_set_hinting (render->ass_renderer, ASS_HINTING_LIGHT); ass_set_hinting (render->ass_renderer, ASS_HINTING_NONE);
ass_set_fonts (render->ass_renderer, "Arial", "sans-serif", 1, NULL, 1); ass_set_fonts (render->ass_renderer, "Arial", "sans-serif", 1, NULL, 1);
ass_set_fonts (render->ass_renderer, NULL, "Sans", 1, NULL, 1); ass_set_fonts (render->ass_renderer, NULL, "Sans", 1, NULL, 1);