Bug reports are handled by Mantis bug tracker .
Include the results of the 4 above steps in your bug report, and always tell us which Kdenlive and MLT version you have!
Please upgrade to the latest released versions of Kdenlive and MLT. We not not answer bug reports for old Kdenlive versions (unless they are still reproducible in latest version).
If your distribution does not offer packages of the latest Kdenlive and MLT versions, please check our download page for tips about upgrading .
Query open issues  on Mantis bug tracker.
Reading the bug page:
Before reporting bugs, read the user manual and search the forums for answers. Do not report bugs on Kdenlive < 0.9, which are deprecated.
If you are not running the latest development release, check recently solved issues , as your problem might already be fixed in the development version.
For the bug report to be useful, please try to provide the following informations:
How to get useful crash information (backtrace)
Please install the following packages: gdb, kdenlive-dbg, libmlt-dbg (package names may slightly change depending on your distro).
When Kdenlive crashes, if the KDE crash handler dialog pops up, you can copy the data it provides.
Otherwise, from a terminal, type:
Kdenlive will start, then you can trigger the bug. When Kdenlive crashes, go to your terminal window and type:
thread apply all bt
Then press enter until you see the full data. Copy the log to a file and attach it to the bug report
For any Mpeg2/Mpeg4 and H264 this is important that you upload RAW footage (coming directly from camcorder) somewhere on Internet. This will allow users to benchmark their computer using this file and also help us understand some bugs. A 5 seconds footage is enough. Do not upload large files of more than 20 Mb.
As regards audio synchronization, video rendering and other issues, we will not answer support request unless your camcorder is in the list and that minimum footage is available somewhere to reproduce bugs.