Lecture videos with increased playback speed and pitch correction
Hi, i would like to convert a video with an increased or decreased playback speed and and pitch correction, using mencoder (amd64 arch.).
$ sudo apt-get install tap-plugins
that commands don't work (mplayer):
mplayer -speed 0.8 -af ladspa=/usr/lib/ladspa/tap_pitch.so:tap_pitch:0:25:-90:0 file.mp3
also mencoder - see the script following the link - doesn't work, with the same issue.
Couldn't find audio filter 'ladspa'
[libaf] Couldn't create or open audio filter 'ladspa'
Error at audio filter chain pre-init!
i set also in .bashrc:
I found also that post:
i use ubuntu on amd64 with ardour and the TAP plugins did not work. some months ago i recompiled them and got them working by switching a compiler option and mailed it to tom who gave me another solution. here is a part of a mail with tom szilagyi:
>could you achieve the same effect by simply adding
>-fno-strict-aliasing to the GCC options, instead of the above?
>I would be interested in the simplest solution.
>So I would just change one line in the Makefile to:
>CFLAGS = -I. -O3 -Wall -fomit-frame-pointer
>-fstrength-reduce -funroll-loops -ffast-math -fno-strict-aliasing -c
>(I just added -fno-strict-aliasing to the end of the -f* list)
>Could you confirm if this works the same as your solution?
this helped me and i work a lot with these plugins as they have a parametric equalizer.
i have similar problems with the holap plugins (exciter !!) on ardour - they still don't work in ardour but in jackrack as i detected now. so for any non-working ardour plugin start jackrack and insert it into the main channel of your mixer, connecting your outs/ins to jackrack, then load the desired plugins into jackrack and test them.
Last edited by apeterle; January 9th, 2012 at 02:42 AM.
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