[FFmpeg-devel] [PATCH] avfilter: add audio signal to distortion ratio filter

[Nicolas George]

Paul B Mahol (12021-09-12):
> Why purely input-driven scheme is wanted/needed to be supported?

Consider this:

input -----> scale -----> sink

If you add frames to the input, they will reach the sink. It can even be
something else than a buffersink and still work. No need to request a
frame on the sink.

OTOH:

input -----> vstack -----> sink
               /
    testsrc --/

If you add frames to the input, they will accumulate in the link before
vstack, because no frame will be requested from the sink.

I think I forgot one rule for filters with multiple inputs: having
enough frames on one input should be considered a sign output is wanted,
and trigger requesting frames on other outputs.

But I am not 100% sure I did not already consider this and discard it
for a reason I forgot, so I need to think about it.

Regards,

-- 
  Nicolas George
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