Hi, maybe someone here can shed some light on a strange performance problem I'm seeing...
I'm using the most recent MLT from git master as the "engine" inside Kdenlive 16.04. When using MLT this way, it is used only single-threaded in my Kdenlive setup. The system I'm using is a core i7 so there are a lot of idle cores hanging around :) Now, I see a strange performance drop whenever in a project I have six or more clips in the same timeline position (the project has 8 tracks or so, but this doesn't matter). That is, I have six or more clips composited onto each other using transitions. When I start playing my project a few seconds before where the six or more clips are on top of each other, performance is okay. However, as soon as MLT enters the region with more than five clips, performance completely breaks down to one frame every several seconds. There are no filters applied to the clips, it is just with five clips and corresponding affine (sometimes a substract) transitions it works okay, but with an additional clip and transitions it completely breaks down. I've seen this behavior also a eight or nine months ago in another Kdenlive project with an older MLT release. Please note that in my situation MLT is rendering to screen. The source clips involved are two H.264 clips (1080p/30 from an HDMI recorder) and some png clips (also 1920x1080). The tripping point always is six clips simultaneously. System has 16gig, memory consumption is far from this with the project loaded and playing. Any idea what the reason could be? What kind of information can I supply to help tracking down this issue? I would exect performance to slowly degrade but not to completely break down by adding just another clip... Best regards, Harald ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
