[Libav-user] Pulling valid subtitle from lavfi

Peter Krefting peter at softwolves.pp.se
Tue Dec 19 09:36:32 EET 2023


> The video and audio comes out just fine, but the subtitle packets all have a 
> length of 30 bytes, and the data appears to be garbage (well, could be raw 
> data I've not explored that).

Are you getting bitmap subtitles? If AVSubtitle::format == 0, you have 
bitmap subtitles.

The format is not immediately obvious, have a look at these posts for 
some help on how to use them:


The former has a code snippet that lets you convert an AVSubtitle into 
an AVFrame that can be input into an encoder to make an image or video 
stream for overlay.

\\// Peter - http://www.softwolves.pp.se/

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