Alternatively, here is Python snippet from a project I did where I needed
audio levels, but you have to use the level determined by this filter
instead of your own code. Here is docs on the filter:
http://www.mltframework.org/bin/view/MLT/FilterAudiolevel
This filter is used to drive the peak meter in Shotcut to give you some
frame-of-reference about its suitability for your task.
mlt.mlt_log_set_level(0)
mlt.Factory.init()
profile = mlt.Profile(config.MLT_PROFILE)
def mlt_open_file(filename):
global profile
producer = mlt.Producer(profile, filename)
producer.attach(mlt.Filter(profile, 'audiolevel'))
return producer
def get_audio_level(frame):
# get_waveform provides an easy way to make the audio fetched.
frame.get_waveform(160, 120)
return frame.get_double('meta.media.audio_level.0')
On Fri, May 1, 2015 at 11:28 AM Pierre-Emmanuel Viau <
pierre-emman...@timecodelab.com> wrote:
> Hello, I am trying to write a simple test in order to get the audio level
> at a certain frame. So far I have:
>
>
> import mlt
> import sys
>
> mlt.Factory.init()
> profile = mlt.Profile( )
> prod = mlt.Producer(profile, sys.argv[1])
> profile.from_producer(prod)
>
> #test
> i = 172
> prod.seek(i)
> frame = prod.get_frame()
> print type(frame.get_audio(mlt.mlt_audio_float, 48000, 2, 1))
>
> This doesn't work, I get the following exception:
> TypeError: in method 'Frame_get_audio', argument 2 of type
> 'mlt_audio_format &'
>
> Do you have an idea of how to fix this?
> Thank you!
>
>
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