I'm trying to make FFmpeg render text/ASS subtitles into bitmap after it decodes the packets into AVSubtitle structure. In the AVSubtitle documentation there is this description:
uint8_t* AVSubtitleRect::data[4]
data+linesize for the bitmap of this subtitle. Can be set for text/ass as well once they are rendered.
However, I can't find any other information on how to enable this. Can anyone please provide a hint?