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Thread: Lecture videos with increased playback speed and pitch correction

  1. #1
    Join Date
    Aug 2007

    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/ 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:
    export LADSPA_PATH=$LADSPA_PATH:/home/alex/.ladspa:/usr/local/lib/ladspa:/usr/lib/ladspa

    Any idea?

    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:

    >Hi Steve,

    >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
    >-fPIC -DPIC

    >(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.

    best wishes,

    Last edited by apeterle; January 9th, 2012 at 02:42 AM.

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