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) ###################### 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).