avcodec/ass: specify a permissive encoding
The Encoding field (and the \fe tag) allows to limit font selection to only those fonts declaring support for the specified codepage in their OS/2's table "Code Page Character Range" field. Particularly, Encoding=0 means only font's declaring support for "ANSI", or rather "Latin (Western European)", are allowed to be selected. Specifying Encoding=1 allows all fonts to be considered. We do not want to limit font selection, so specify Encoding=1. NB: at the time of writing libass only partially supports this field, thus hiding the issue in any libass-based renderer. A VSFilter-based DirectShow filter or XySubFilter will reveal the issue when a font not declaring support for latin characters is specified in a style.
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