[FFmpeg-user] bitmap-subtitle in stream

[Thomas Schmiedl]

Am 16.06.2018 um 19:03 schrieb Carl Eugen Hoyos:
> 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
Could someone provide a workflow how to do that programmatically. Until 
now I have only worked with the ffmpeg-application in combination with 
xupnpd2 mediaserver.

Thanks, Thomas
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