Comment 4 for bug 1067328

Sorry, I think you misunderstood - the point is to check your *source* files with ffplay/melt. As the ffmpeg libraries & MLT provide the format & seeking support for OpenShot, we need to identify if they can handle the files properly first (the seeking is important as you are trimming your file, rather than just simply playing it back). If they have a problem with your source files, then OpenShot will too.

The latest MLT is available in a PPA, ppa:sunab/kdenlive-release. This will only work with OpenShot 1.4.3 & above.