[FFmpeg-user] bitmap-subtitle in stream

Carl Eugen Hoyos ceffmpeg at gmail.com
Sat Jun 16 20:03:15 EEST 2018

2018-06-16 18:56 GMT+02:00, Thomas Schmiedl <thomas.schmiedl at web.de>:

> I use ffmpeg on a router to restream a DASH-stream
> (https://live.idnes.cz/slow/slowtv7_720p/manifest.mpd) to a local
> htdocs-folder as HLS on the router. The media-server xupnpd2
> reads the HLS and transfers it to the TV.
> On the DASH-stream website
> https://slowtv.playtvak.cz/prave-ted-mazaci-tramvaj-jede-prahou-d73-/mazaci-tramvaj.aspx?c=A150908_111659_mazaci-tramvaj_plap
> is a map with the actual position of the tram. The router is to slow
> for re-encoding using the video-filter "overlay".
> Is it possible to integrate a bitmap-based subtitle in the generated
> HLS-stream containing an actual map-image (e.g.
> http://staticmap.openstreetmap.de/staticmap.php?center=50.05619,14.43873&zoom=15&size=800x300&maptype=mapnik&markers=50.05619,14.43873,ol-marker)
> without re-encoding?

In theory, you could provide subtitles but all formats are palettized
and creating a palettized image also takes time. In any case, you
would have to implement this programmatically.

Carl Eugen

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