[FFmpeg-trac] #3299(avfilter:new): Add the possibility to fade in / fade out text with drawtext

[FFmpeg]

#3299: Add the possibility to fade in / fade out text with drawtext
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             Reporter:  slhck     |                     Type:  enhancement
               Status:  new       |                 Priority:  wish
            Component:  avfilter  |                  Version:  unspecified
             Keywords:  drawtext  |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 The `drawtext` filter currently does not allow fading in or fading out of
 text. It'd be a useful feature to have, but at the moment, I think this
 can only be achieved by rendering ASS effects, pre-generating the subtitle
 text with ImageMagick (or something similar), or a super complex `blend`
 filter.

 I could imagine that this is easily implemented with two additional
 options:

 * fade in duration
 * fade out duration

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Ticket URL: <https://trac.ffmpeg.org/ticket/3299>
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