Comment 2 for bug 1226080

Bug Date: Sept 16th and Today

Reporter: Me

Architecture (64 bits or 32 bits): 64 bits

Plateform (Linux, Windows, Mac OSX): Linux

Operating System (Ubuntu, Archlinux, Seven, Mountain Lion, .....): Xubuntu

Version OS ( 12.04, 7, 10.6, ....): 13.04

New installation or update: fresh install, updated too.

Installation Method: software center, ubuntu's repos

Version of Openshot installed: Openshot 1.4.3

Revision used (if any): no idea.

MLT Version: melt 0.8.8 / MLT 0.8.8-1

FFmpeg version: ffmpeg 6:0.8.6-1ubuntu2

Ffmpeg installation: Ubuntu repos

Summary/Description: OpenShot always crash here when i'm trying to export (to any format) WHEN the project has a slowed down video-audio track inside it.
Also happen with a speedup clip (fastest speed time).

Steps to reproduce: Insert a video, go to clip properties, change speed (slow it down) 1/3 for example, apply, and then try to export to a video.

Additional information: output with OpenShot running in a console:
python: /build/buildd/libav-extra-0.8.6ubuntu2/libav/libavutil/mathematics.c:79: av_rescale_rnd: Assertion `c > 0' failed.
Aborted (core dumped)

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Second FAQ, with the script:
Kernel
------
Linux ATTD-Zen 3.8.0-30-generic #44-Ubuntu SMP Thu Aug 22 20:52:24 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Architecture
------
x86_64

OS Version
------
Ubuntu 13.04

ffmpeg Version
------
ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
ffmpeg 0.8.6-6:0.8.6-1ubuntu2
libavutil 51. 22. 1 / 51. 22. 1
libavcodec 53. 35. 0 / 53. 35. 0
libavformat 53. 21. 1 / 53. 21. 1
libavdevice 53. 2. 0 / 53. 2. 0
libavfilter 2. 15. 0 / 2. 15. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 52. 0. 0 / 52. 0. 0

openshot Version
------
openshot 1.4.3-1

ffmpeg Version
------
ffmpeg 6:0.8.6-1ubuntu2

melt / mlt Version
------

Version libreria MLT
------
ii libmlt++3 0.8.8-1 amd64 MLT multimedia framework C++ wrapper (runtime)
ii libmlt-data 0.8.8-1 all multimedia framework (data)
ii libmlt5 0.8.8-1 amd64 multimedia framework (runtime)

Version libreria libav
------
ii gstreamer1.0-libav:amd64 1.0.6-1 amd64 FFmpeg plugin for GStreamer
ii libav-tools 6:0.8.6-1ubuntu2 amd64 Multimedia player, server, encoder and transcoder
ii libavahi-client3:amd64 0.6.31-1ubuntu3 amd64 Avahi client library
ii libavahi-client3:i386 0.6.31-1ubuntu3 i386 Avahi client library
ii libavahi-common-data:amd64 0.6.31-1ubuntu3 amd64 Avahi common data files
ii libavahi-common-data:i386 0.6.31-1ubuntu3 i386 Avahi common data files
ii libavahi-common3:amd64 0.6.31-1ubuntu3 amd64 Avahi common library
ii libavahi-common3:i386 0.6.31-1ubuntu3 i386 Avahi common library
ii libavahi-core7:amd64 0.6.31-1ubuntu3 amd64 Avahi's embeddable mDNS/DNS-SD library
ii libavahi-glib1:amd64 0.6.31-1ubuntu3 amd64 Avahi GLib integration library
ii libavahi-gobject0:amd64 0.6.31-1ubuntu3 amd64 Avahi GObject library
ii libavc1394-0:amd64 0.5.4-2 amd64 control IEEE 1394 audio/video devices
ii libavc1394-0:i386 0.5.4-2 i386 control IEEE 1394 audio/video devices
ii libavcodec-extra-53:amd64 6:0.8.6ubuntu2 amd64 Libav codec library
rc libavcodec53:amd64 6:0.8.6-1ubuntu2 amd64 Libav codec library
ii libavdevice53:amd64 6:0.8.6-1ubuntu2 amd64 Libav device handling library
ii libavfilter2:amd64 6:0.8.6-1ubuntu2 amd64 Libav video filtering library
ii libavformat53:amd64 6:0.8.6-1ubuntu2 amd64 Libav file format library
ii libavutil-extra-51:amd64 6:0.8.6ubuntu2 amd64 Libav utility library
rc libavutil51:amd64 6:0.8.6-1ubuntu2 amd64 Libav utility library
esteban@ATTD-Zen:~$

######################

About:
https://answers.launchpad.net/openshot/+faq/983
1) Does the video play and seek correctly with "ffplay"?
2) Does the video play and seek correctly with "melt"?
The non-slowed down one, yes it does.
The problem is trying to export the proyect with the clip slowed down.

3) Please include details on the video file:
Input #0, avi, from './P9150928.AVI':
  Metadata:
    creation_time : 2013-09-15 15:33:59
    encoder : OLYMPUS E-PM1
  Duration: 00:00:08.56, start: 0.000000, bitrate: 33579 kb/s
    Stream #0.0: Video: mjpeg, yuvj422p, 1280x720, 30 tbr, 30 tbn, 30 tbc
    Stream #0.1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s

4) Please attach a small sample video (less than 10 MB), which reproduces the problem.
Can't because the problem it's not the video. Is the exporting process.
Testing with 3 different videos from 3 different sources, same bug after change clip speed (fast or slow).