Hi everybody.

I'm new in Kdenlive (my first work with this software) and it seems to render bad and very slowly.

My first project on this software is a short movie. I used the big file I recorded and then made 150 virtual clips, and added some more small mpeg files and wav sounds. I use a P-IV, 2.8Ghz, double core, 2Gb RAM. running Ubuntu 9.04.

I've been working with a low-res 150 Mb. (320x200) file made from the big 3,5 Gb. (720x576) because it takes about 15 minutes to open the project and see the clips. The conversion was made using ffmpeg.
Well, if I render the project from the low resolution file it produces a correct output in reasonable time (5 minutes). After renaming files to produce a high-res output it takes more than 15 hours to render (sometimes it hangs) and most of the images in the first third are black. I've tried different codec outputs with the same result and, also, reviewed the big the big file using Avidemux to see if there were any problem on it.

Does anyone have an idea of what may be happenning?

You need to provide more information. Things like versions and formats and codecs in use. Try to be as forthcoming as possible with information.

I'm using version 0.7.3 of Kdenlive and 0.5-svn17737 of ffmpeg and inigo 0.3.8
The 3.5 Gb. 720x576 PAL file is an mpeg and the converted 150 Mb. is also 720x576 PAL but a lower bitrate (not lower-res, as said before).
Attached is the file info Avidemux provides, big file is on the left

Which more information would be useful?

Thankx in advance

Is the source (big) video file MPEG-1, MPEG-2, MPEG-4 part 2, or MPEG-4 AVC (H.264)?
It sounds like MLT and FFmpeg are simply not handling your source file. What or how was it created?
You can test FFmpeg alone by playing it the 'ffplay' command line utility. Clicking the video window makes it seek, in order to test seeking (video editing requires seeking).

You´re right, man! Apparently the big file was rare since its container had 50fps wether the mpg embedded was 25fps. Furthermore it did not work fine using ffplay. It was very difficult to re-make this file, it was generated using Avidemux cutting unwanted parts from 7 or 8 different files, so I decided to rebuild a new one from the actual. I used ffmpeg in a similar way I built the small file, but a larger bitrate. After a while I tried to open the kdenlive project and:

Voilà!

it now opens fast and renders fast and correctly every frame, taking about 4 minutes to render the whole 2:40 minutes video file.

Thank you VERY VERY VERY MUCH!

PS. (Well, actually I´ve now another problem... it crashes in title generation)