Anton Khirnov (12023-11-09):
> The problem with that code (and the reason this patch exists), is that
> it depends on the order in which the frames arrive on filtergraph
> inputs, which is not meaningful (and becomes non-deterministic with
> threading).

I can understand that. We will have to find a solution, won't we? (I
hope you do not consider removing a feature that people have been using
for years an option.)

I can suggest this: have demuxer code emit virtual subtitles packets to
trigger the sending of the heartbeat frames.

Regards,

-- 
  Nicolas George