Updating a few packages at a time from a Dec 26 snapshot of Ubuntu Precise, I found that Kdenlive itself seems to be OK, upgrading mlt from what was in the Dec 26 snapshot to current versions causes a delayed rendering crash, updating the ffmpeg libraries (avcodec, avformat, etc) to the current versions causes an immediate rendering crash. In addition, upgrading tap-plugins (!) causes an immediate render crash, even though this is not a dependency of Kdenlive or anything underlying it.
Updating a few packages at a time from a Dec 26 snapshot of Ubuntu Precise, I found that Kdenlive itself seems to be OK, upgrading mlt from what was in the Dec 26 snapshot to current versions causes a delayed rendering crash, updating the ffmpeg libraries (avcodec, avformat, etc) to the current versions causes an immediate rendering crash. In addition, upgrading tap-plugins (!) causes an immediate render crash, even though this is not a dependency of Kdenlive or anything underlying it.