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Message #02375
[Bug 988765] Re: Openshot lags when working with many clips on timeline
Looks like my libmlt is even newer than on Sunab ppa
mine is libmlt4 0.7.6+git20120204-2
version in the ppa pool is
libmlt4_0.7.6-0ubuntu0~sunab~oneiric3_amd64.deb, published 01-Nov-2011
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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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References