Hello,
I have a somewhat simple project, about 6 minutes long, where I try to edit some mp4 clips (QVGA 15 fps), putting a couple of title clips and background soundtracks here and there. I export in MPEG4 or XVid, 400 k.

My problems started when I tryed and reduce the overall volume of an 8s mp3 file, converted with ffmpeg from the audio part of a flv. This mp3 underlies a simple title clip.
I "resize" the mp3, I use the volume effect letting gain start from 0 and increase rapidly to 30, and everything seems fine in the preview, but - after any of the two renderings - that mp3, all the following clips in the same audio track, and a couple of video clips (after that mp3) with volume effect applied are simply not played.

Actually I thought it could be due to the fact that I was not letting the mp3 gain to reach 30 (but preview worked!). I changed 30 to 100: as for the couple of not-working video clips, if I do not set a volume effect point to (at least) gain=100 their preview does not work.

I must add that at the very beginning of the project I have two overlaid mp3s, both have volume effect applied (one does not reach gain=100 as well) but in that part I experience no problem.


What could be the issue?

Thank you, cheers - N.

Hi!
I have the same problem. Have you found some solutions?
Thanks,
Francesco

refer to:
http://www.kdenlive.org/forum/volume-effect-work-preview-not-after-rendering