OpenShot Crash at videospeed x5 / x10 / ...

[Bernd Faulstich]

Hello together,

Is i play the preview or render the project openshot crashes with the error:
python: /build/buildd/libav-extra-0.8.6ubuntu2/libav/libavutil/mathematics.c:80: av_rescale_rnd: Zusicherung »b >=0« nicht erfüllt.
(means: b>=0 is not met)

found same error here:
http://forum.ubuntuusers.de/topic/openshot-stuerzt-bei-dreifacher-geschwindigkei/#post-5642922

If i speed up a clip and play it, i got a different result than expectet. Just some pictures from the clip, but not the faster clip.
Is there a problem with the lib?

Thanks for your help
bernibaerchen

PS.:
LSB Version: core-2.0-ia32:core-2.0-noarch:core-3.0-ia32:core-3.0-noarch:core-3.1-ia32:core-3.1-noarch:core-3.2-ia32:core-3.2-noarch:core-4.0-ia32:core-4.0-noarch

apt-cache policy openshot
openshot:
  Installiert: 1.4.3-1
  Installationskandidat: 1.4.3-1
  Versionstabelle:
 *** 1.4.3-1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status

apt-cache policy openshot gtk2-engines-pixbuf fontconfig librsvg2-common melt python-gtk2 python-httplib2 python-imaging python-mlt5 python-pygoocanvas python-xdg python python-support blender inkscape
openshot:
  Installiert: 1.4.3-1
  Installationskandidat: 1.4.3-1
  Versionstabelle:
 *** 1.4.3-1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status
gtk2-engines-pixbuf:
  Installiert: 2.24.17-0ubuntu2
  Installationskandidat: 2.24.17-0ubuntu2
  Versionstabelle:
 *** 2.24.17-0ubuntu2 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status
fontconfig:
  Installiert: 2.10.2-0ubuntu2
  Installationskandidat: 2.10.2-0ubuntu2
  Versionstabelle:
 *** 2.10.2-0ubuntu2 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status
librsvg2-common:
  Installiert: 2.36.4-1
  Installationskandidat: 2.36.4-1
  Versionstabelle:
 *** 2.36.4-1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status
melt:
  Installiert: 0.8.8-1
  Installationskandidat: 0.8.8-1
  Versionstabelle:
 *** 0.8.8-1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status
python-gtk2:
  Installiert: 2.24.0-3ubuntu1
  Installationskandidat: 2.24.0-3ubuntu1
  Versionstabelle:
 *** 2.24.0-3ubuntu1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status
python-httplib2:
  Installiert: 0.7.7-1ubuntu0.1
  Installationskandidat: 0.7.7-1ubuntu0.1
  Versionstabelle:
 *** 0.7.7-1ubuntu0.1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring-updates/main i386 Packages
        500 http://security.ubuntu.com/ubuntu/ raring-security/main i386 Packages
        100 /var/lib/dpkg/status
     0.7.7-1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
python-imaging:
  Installiert: 1.1.7+2.0.0-1ubuntu0.1
  Installationskandidat: 1.1.7+2.0.0-1ubuntu0.1
  Versionstabelle:
 *** 1.1.7+2.0.0-1ubuntu0.1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring-updates/main i386 Packages
        100 /var/lib/dpkg/status
     1.1.7+2.0.0-1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
python-mlt5:
  Installiert: 0.8.8-1
  Installationskandidat: 0.8.8-1
  Versionstabelle:
 *** 0.8.8-1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status
python-pygoocanvas:
  Installiert: 0.14.1-1ubuntu8
  Installationskandidat: 0.14.1-1ubuntu8
  Versionstabelle:
 *** 0.14.1-1ubuntu8 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status
python-xdg:
  Installiert: 0.25-2
  Installationskandidat: 0.25-2
  Versionstabelle:
 *** 0.25-2 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status
python:
  Installiert: 2.7.4-0ubuntu1
  Installationskandidat: 2.7.4-0ubuntu1
  Versionstabelle:
 *** 2.7.4-0ubuntu1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status
python-support:
  Installiert: 1.0.15
  Installationskandidat: 1.0.15
  Versionstabelle:
 *** 1.0.15 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status
blender:
  Installiert: 2.66a-3ubuntu1
  Installationskandidat: 2.66a-3ubuntu1
  Versionstabelle:
 *** 2.66a-3ubuntu1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages
        100 /var/lib/dpkg/status
inkscape:
  Installiert: 0.48.4-0.1ubuntu2
  Installationskandidat: 0.48.4-0.1ubuntu2
  Versionstabelle:
 *** 0.48.4-0.1ubuntu2 0
        500 http://ch.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status

[Andy Finch (fincha)]

To help narrow down the problem, please can you try speeding up your videos using ffmpeg & melt:

for ffmpeg, something like this:

ffmpeg -i input.mkv -filter:v 'setpts=0.5*PTS' output.mkv

for melt, I don't know the exact cmd line syntax to use, so create a simple project in OpenShot that has the problem. Then use the menu item File>Export XML to create an xml file that can be parsed by melt, such as:

melt filename.xml

By doing this, we can see if the problem is in ffmpeg, MLT or OpenShot.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.