Hi,
I've been working on a audio mix tool for Flowblade lately.
So far I've been combining track audios by calling the following
method on every track:
def _mix_audio_for_track(self, track):
transition = mlt.Transition(self.profile, "mix")
transition.set("a_track", 1)
transition.set("b_track", track.id)
transition.set("always_active", 1)
transition.set("combine", 1)
self.field.plant_transition(transition, 1, track.id)
# Hold reference and set gain
track.mix_transition = transition
track.mix_transition.set("start", str(track.audio_gain))
track.mix_transition.set("end", str(track.audio_gain))
and it works fine. Now I tried to set gain for single track by calling
method below with values 0 - 1.
def set_track_gain(self, track, gain):
track.mix_transition.set("start", str(gain))
track.mix_transition.set("end", str(gain))
I though if set "start" and "end" with same value, then gain changes
for the whole duration of the track. But this has no effect at all.
I read transition_mix.c shortly, but it is not obvious what the
correct thing to do here is.
So how do I set track gains, do I need to use a separate volume filter
or something?
Janne
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