[FFmpeg-user] Overlay one subtitle stream and copy another

[Carl Eugen Hoyos]

Hans Carlson <forbyta <at> inbox.com> writes:

> I changed my original command to use this filter_complex:
> 
>    -filter_complex 'fifo; [0:v][0:3]overlay'

I suspect the stream specifiers [0:v] and [0:3] ensure 
that fifo is not used.
I am not sure what the correct usage is but you could 
try '[0:v}fifo[v];[0:3]fifo[o];[v][o]overlay`
(untested)

Carl Eugen