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f_lavfi: mp_lavfi_is_usable: check for "lavfi-" prefix
Without this, adding filters with the prefix would fail, and some filters that have conflicting names with mpv ones were unusable.
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@ -943,6 +943,10 @@ static bool is_usable(const AVFilter *filter, int media_type)
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bool mp_lavfi_is_usable(const char *name, int media_type)
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{
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// Skip the lavfi- prefix, if present.
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if (strncmp(name, "lavfi-", 6) == 0)
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name += 6;
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const AVFilter *f = avfilter_get_by_name(name);
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return f && is_usable(f, media_type);
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}
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