Am 19.04.2020 um 20:44 schrieb Mark Filipak:
I'm hooking into this to reply in order to get the message below into
the thread.
But first, I'd like to say that I had no idea this would be
controversial. I asked whether ffmpeg traversed filter complexes
recursively because that was not happening. Apparently it does
recurse, but only if you connect certain pads to certain other pads.
I don't understand what you mean by "recursively".
Specifically, it depends on how you 'wire up' a 'blend' filter. I
learned that from Michael Koch after he suggested that I reverse the
connections to the 'blend' filter. It worked and instead of getting
80% of the input frames in the output, I got 100% of the frames (minus
a couple of frames, but that doesn't matter).
I think that's a timestamp problem. The output of the blend filter might
have the same timestamp as one of its inputs. And then the interleave
filter gets two frames with the same timestamp and the output becomes
unpredictable.
Michael
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