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[madpentiste <antoine.messiah@xxxxxxx>]

I had the same kind of problems (working with many video filess photo
files, audio files, titles, image sequences, etc., all totalizing over
1Gb of source material and over half-hour of final video).

The problem disappeared when I put files on several separate, fast-access, USB keys (for example Patriot). 
I tried the following configuration: 
    - videos on one USB key
   - projects and thumbnails on a second USB key
    - other files (music, pictures/photos, sequence of pictures) on a third USB key

With that configuration, everything worked fast, almost instantly.

The downside is that if you do this in the middle of an ongoing project,
you'll have the usual message "The following file(s) no longer exist",
in which case you have to change each file property (the path part of
the name) to reflect the files new location.

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https://bugs.launchpad.net/bugs/988765

Title:
  Openshot lags when working with many clips on timeline

Status in OpenShot Video Editor:
  New

Bug description:
  I have many segments on a timeline in a signle track, probably about a hundred. Every time I change a clip on a timeline somehow, openshot lags for several seconds before playback. Threre're a lot of messages in console during the lag:
  [avi @ 0x13f8dd60] sample size (1) != block align (1024)
  [avi @ 0x13f8dd60] max_analyze_duration reached
  which comes from avformat_find_stream_info() in libavformat, which's called from get_basic_info() in mtl, I haven't made any further research 'cause I'm not a python guy :)
  Looks like openshot tries to get stream info for every clip on a track when track contents changes?
  Here's a screencast: http://s0me0ne.com/external/openshot.ogv
  Note two lags: first one after I drop a clip to timeline and click on a timeline on some point inside a clip, and the second one, after a clip is cut, between pressing of "play" button and actual playback start.
  Running on Core i7-2600 @3.4GHz with 12Gb RAM.

  $ uname -a
  Linux ws 3.2.0-22-generic #35-Ubuntu SMP Tue Apr 3 18:33:15 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  $ cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=12.04
  DISTRIB_CODENAME=precise
  DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"

  $ dpkg -l |egrep 'openshot|libav.*5[23]|mlt|melt|python2'
  ii  libavcodec52                           4:0.6.4-0ubuntu0.11.04.1                   Libav codec library
  ii  libavcodec53                           4:0.8.1-0ubuntu1                           Libav codec library
  ii  libavdevice53                          4:0.8.1-0ubuntu1                           Libav device handling library
  ii  libavformat52                          4:0.6.4-0ubuntu0.11.04.1                   Libav file format library
  ii  libavformat53                          4:0.8.1-0ubuntu1                           Libav file format library
  ii  libmlt++3                              0.7.6+git20120204-2                        MLT multimedia framework C++ wrapper (runtime)
  ii  libmlt-data                            0.7.6+git20120204-2                        multimedia framework (data)
  ii  libmlt4                                0.7.6+git20120204-2                        multimedia framework (runtime)
  ii  libpython2.7                           2.7.3-0ubuntu3                             Shared Python runtime library (version 2.7)
  ii  melt                                   0.7.6+git20120204-2                        command line media player and video editor
  ii  openshot                               1.4.2-1                                    Create and edit videos and movies
  ii  openshot-doc                           1.4.2-1                                    Help manual for OpenShot Video Editor
  ii  python-mlt3                            0.7.6+git20120204-2                        multimedia framework (python bindings)
  ii  python2.7                              2.7.3-0ubuntu3                             Interactive high-level object-oriented language (version 2.7)
  ii  python2.7-minimal                      2.7.3-0ubuntu3                             Minimal subset of the Python language (version 2.7)

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