Clip /media/sda1/Documents/Videos/kdenlive/Capture_kdenlive/capture0001.mp4 is missing or invalid. Remove it from project?

Hello,
I have just installed kdenlive 0.7.8 but now I can't record videos from a miro pctv card (composite entry).
I have the error : Clip /media/sda1/Documents/Videos/kdenlive/Capture_kdenlive/capture0001.mp4 is missing or invalid. Remove it from project?
The file capture0001.mp4 is created but the size is 0
Is it a pb of capture parameters? (I have -f oss -i /dev/dsp -acodec mp2 -f video4linux2 -s 720x576 -r 25 -i /dev/video0 -vcodec mpeg4)
But it was working correctly with the 0.7.7.1.
I use ubuntu 10.04 lts up to date.
If I delete kdenlive 0.7.8 and then install the 0.7.7.1 kdenlive, I can record videos.
then I update to kdenlive 0.7.8 and it's not working.
The file capture0001.mp4 is created but the size is 0

(I can record with cinelerra (it works) but I don't use it, too complicated for me..).

Do you know that pb, can you help me?
Something missing?
Thank you.

Forums: