When running kdenlive 15.08 with Movit enabled, any attempt to render out the timeline opens a full size playback window on screen and writes a zero byte file as the output. At the end of playback on that screen, the renderer hangs. Closing the window causes the render to report a finished render job, but the file remains the zero byte file. Also, the CPU load is way too low to be encoding a 1080p file at that speed, I think no encoding is taking place.

System is AMD FX-8120 with radeon HD5750 and the open source Radeon driver. Ubuntu's PPA driver is used under Debian Unstable and local builds of Kdenlive and MLT. The MLT build includes enabled VDPAU which does not show any extra kdenlive config options but might be being used given that early versions of 15.04 would sometimes report a VDPAU error at a transition or on some clips but keep playing. Video clips are 1080i AVCHD clips in 1080p projects rendering out at 29.97fps. Rendering works fine to original project resolution if GPU processing is NOT enabled.

Perhaps this is just a proof of concept renderer for now and the ability to render on on Movit is still to come? Is this a video driver specific issue? I remember seeing early evaluations of Movit that were on Nvidia cards, presumably with the blob(closed) driver. For me open drivers are required for security reasons.

EDIT 1-27-2016: found the fix by chance, posted this notice viewtopic.php?f=272&t=130782#p350378
Ugly mess: it took months of experimentation before i finally found the true cause of this, with some help from the MLT devs.

EDIT 3-30-2016: it turns out this issue seems to be caused caused by the --disable-qt option formerly needed in KF5 builds to keep KDE4 libraries from loading too and causing a segfault. Apparently I removed that from my build options at the same time I removed VDPAU enablement. For MLT 6.1.0 I just had sucess with these build options.

Code: Select all

./configure --prefix=/usr --enable-gpl --enable-gpl3