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[relgames <1130920@xxxxxxxxxxxxxxxxxx>]

Sorry for misunderstanding, I thought that question was about Ubuntu
installation. Openshot was installed from Ubuntu repos, not from usb
stick.

Anyway, I managed to solve the problem. It was because of melt/libmlt, I had the same issue in kdenlive.
melt was unable to correctly process "Audio: pcm_u8, 11024 Hz, 1 channels, u8, 88 kb/s" audio format.
I converted the sound stream for all videos it to "pcm_s16le, 22050 Hz, 1 channels, s16, 352 kb/s" and glitches are gone!

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https://bugs.launchpad.net/bugs/1130920

Title:
  audio glitches when trying to play

Status in “openshot” package in Ubuntu:
  New

Bug description:
  When I try to play or export project as a video file, I hear strange audio artifacts.
  Here is an example http://www.youtube.com/watch?v=-VS9_6pgpmA

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: openshot 1.4.3-1
  ProcVersionSignature: Ubuntu 3.5.0-24.37-generic 3.5.7.4
  Uname: Linux 3.5.0-24-generic i686
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  Date: Wed Feb 20 22:04:32 2013
  InstallationDate: Installed on 2012-12-31 (51 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: openshot
  UpgradeStatus: No upgrade log present (probably fresh install)

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