I'm new to Kdenlive, having just discovered it last weekend, and I must say I'm pleasantly surprised by its features and slickness.

What I want to use it for is editing clips captured using Fraps on Windows (FPS1 codec, .avi container, 1680x1050, 50fps, no audio), nothing fancy at least for a start, just putting them together, cut, add audio tracks. I can import them fine in Kdenlive, but when I play them back the speed is very slow, way less than the normal speed. This is using the clip monitor, and without adding either effects or video. To import the clips I created a new project profile with a resolution of 1680x1050, 50:1 fps, 1:1 PAR, 16:10 DAR, not sure if that's correct.

My PC is a Core i7-860 with 8GB RAM, I think it should be powerful enough. I've tried Kdenlive 0.7.6 on both Gentoo and Ubuntu (the latter being run in a virtual machine), and they have the same playback issue. I tried converting the clips to lossless HuffYUV and import that into Kdenlive with same results as the original format.

Searching these forums, someone was saying not all formats can be played back in realtime. If that's true and FFmpeg's FPS1 codec doesn't allow it, could you recommend a (preferably lossless) format I can convert the original Fraps to, so Kdenlive can play them back at normal speed?

Sorry if anything above may sound newbish, I'm new to the digital video formats and editing, any help will be greatly appreciated!

It sounds like FFmpeg libs are interpreting the video is at 25fps rather than 50. In a terminal window, play the clip with ffplay. Does it play at the correct speed?

Thanks for the reply. I tried ffplay, and it plays the clip at normal speed. I imported the same clip in Kdenlive right after, and the playback was sluggish again. To me it doesn't look like the speed is halved, more like the playback is choked due to lack of resources, not sure how to explain it better.