Re: IMediaSeeking rate issues

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From: Iain (Iain_at_idclTAKEAWAY.co.uk)
Date: 01/14/05

  • Next message: boris: "Re: IMediaSeeking rate issues" 
    Date: Fri, 14 Jan 2005 15:47:32 +0000

    On Fri, 14 Jan 2005 07:15:03 -0800, Boris wrote:

    > Iain,
    >
    > Sorry about the late answer, but I missed the reply notification.
    >
    > I was trying to implement a beat mix functionality (audio only, trying to
    > match different bpm's) when fading from one filter graph to another (ie
    > increase or decrease play back rate to match the next track). Was mostly
    > thought of as proof of concept code, since the pitch change might warp the
    > audio too much. Also, since it's part of a fading process, the start / stop
    > of the FG is not a viable solution - it must be a smooth transition.
    >
    > Best regards
    > Boris

    Well IMHO you will need to implement pitch shift (or rather rate change
    with no pitch shift) for this to be bearable - sliding up even a semitone
    (< 10% rate change) will be very noticable.

    There are a number of commercial solutions on the market. Cakewalk has
    such a filter in SONAR (though unlikely you could purchase it).

    More practically, Ianier Munoz of www.Chronotron.com has two decent rate
    change / pitch shift filters (one low resource and, hmm and one really
    quite good, but a fairly high cpu usage). HIs licensing terms are
    reasonable.

    Iain 

    -- 
Iain Downs (DirectShow MVP)
Software Product Consultant
www.idcl.co.uk
  • Next message: boris: "Re: IMediaSeeking rate issues"

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