Hello everybody!
Ive got a little problem here.
Im using kdenlive for a couple of days now, and I bumped into this trouble:
I made a video project, using a serveral videos, sounds an images.
Now I try to render (mpeg-2 200 k) and kdenlive says:

[theora @ 0x7f38cf4aed30]vp3: first frame not a keyframe

How can I solve this?

Please help :)

I do not think the message about theora is the source of your crash. Can you test a much higher bitrate MPEG-2? Does something else like DV or MPEG-4 work? How about when you place a short clip on the timeline by itself and render using the profile you want to use?

Every format gives the same error: first frame not a keyframe.
:S
What can I do?

Sorry, I guess you can not use that clip directly. You will have to transcode it. In version 0.7.6, I added some new Kdenlive Transcode presets "Fix Ogg Theora" and "Lossless Matroska" that might help. However, I do suggest you place just any other clip on the timeline, trim it down to about a minute, and test rendering to see if you can render something.