[MacPorts] #37020: Add libass (subtitle burning) to ffmpeg

[MacPorts]

#37020: Add libass (subtitle burning) to ffmpeg
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 Reporter:  pdan-mp@…    |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.2
 Keywords:               |       Port:  ffmpeg
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 Add libass (subtitle burning) to ffmpeg

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Ticket URL: <https://trac.macports.org/ticket/37020>
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