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["S. Nizio" <784739@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 769743 ***
    https://bugs.launchpad.net/bugs/769743

I'll post my observations, maybe they'll be helpful for you or other
users. Maybe these facts are known to you OpenShot developers, so you'll
get a confirmation.

The crash doesn't occur with MLT 0.7.4, and the exact "fix" in MLT that
does it is the commit that… updates version number in MLT to 0.7.4 (on
top on previous commits, certainly). And as you know, if OpenShot 1.4.0
detects MLT 0.7.4, it does some checks if an effect is available:

> Warning: effect not found in your version of Sox: sox:echo

etc., etc. and doesn't display non-existent effects.
So, with MLT 0.7.4 I got only "Balance" effect in audio effects.
And it turned out that with MLT 0.7.2 the crash I'd described *doesn't* occur if I use  the Balance audio effect.

So in a few words: it looks like the crash has been caused by OpenShot
(or user) trying to use a sox effect that doesn't exist (but was listed
anyway). It's not listed with MLT 0.7.4 and the crash doesn't happen,
because a user can't use it.

Ref.: openshot/windows/TreeEffects.py (for 1.4.0),  populate_tree. Good
to see it fixed!

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https://bugs.launchpad.net/bugs/784739

Title:
  crash in libmlt after adding sound effect

Status in OpenShot Video Editor:
  New

Bug description:
  Sabayon
  tested and happens on: Openshot 1.2.2, 1.3.0, 1.3.1
  with mlt 0.5.10 and 0.7.2
  with ffmpeg 0.6 + patches
  Python 2.7

  from dmesg for melt 0.7.2:
  openshot[16206]: segfault at 4 ip b555174c sp bfdb1eb0 error 4 in libmlt.so.0.7.2[b5543000+21000]

  steps to reproduce:
  - import file (tested with swf and mp3)
  - drag and drop file to the track
  - from Effects add any audio effect (tested with echo and bass)
  - click on the time scale as if you wanted to move the "time pointer"

  what happens: immediate crash.

  (Mlt module imports in Python without problems.)

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