On Fri, Nov 12, 2010 at 1:49 AM, Alberto Villa <[email protected]> wrote: > hello lists! > how long! :) > > i have a problem with a user on freebsd: > http://www.freebsd.org/cgi/query-pr.cgi?pr=151938 > in few words, even with his quad core computer and his nvidia card, > he's not able to work with hd video because it's too slow. only
He posted a bug in kdenlive.org/mantis and I immediately closed it because a bug report that basically says "go faster" is useless. It is too high; that is a goal, not a bug. Just like goals of being stable or easy-to-use. > recently i bought a laptop with nvidia (i had intel), so i know > nothing about nvidia, vdpau, and all those terms i've not cared about > too much in the past, and i'm not able to give it a try at the moment > do you have any suggestions (fyi, we have a libvdpau port, but i don't > know if it can be useful)? Within Kdenlive/MLT, vdpau is not much faster than a modern, powerful intel cpu. It is hard for people to understand or believe this because they try to compare it with mplayer as he has done. In a player, the decoded video can stay in video memory for display. In a video editor (or playback with some enhanced filters) the uncompressed video must transfer back to system RAM over PCI, processed - possibly through multiple stages - and then transferred back to video RAM for presentation. That is a huge bottleneck. OK, so, let's just use the GPU for everything, right? Except we are small team of part-time hobbyists. The the new Adobe Premiere Mercury Engine basically does this, and it is very impressive, but Adobe has extensive resources to pull that off. Information about his video format is here: http://www.kdenlive.org/video-editor/toshiba-camileo-s10 As long as it really is a MOV container, then it should not suffer the lag of seeking in AVCHD TS files. Maybe if it progressive scan, it can benefit from parallelized decoding, which can be set in the Advanced tab of the Clip Properties. Is he using a source or binary package? Either way, was his FFmpeg built with yasm installed and pthreads enabled? Is he using a project setting profile that matches his video clip? If not, then the must be scaled in software. Basically, it is idiotic to compare a video editor to a media player. How do you compare something that needs frame accurate seeking, higher depth colorspaces (we convert yuv420 to yuv422 and rgba currently), and compositions of mixed resolutions (necessitating scaling and padding) to something as simple as sequential playback with typically no post-processing and only moderate seeking requirements? +-DRD-+ ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ Kdenlive-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kdenlive-devel
