Hi everyone !
This is my first post, I'll try to be clear about my problem, but don't hesitate to tell me if I miss something !

Problem :
When I try to render, within Kdenlive or with a generated script, the melt process quickly eat 90% of my memory, and then slowly grow until it crashes.

System :
- I'm on an Ubuntu 10.04 (64 bits), I tried both standard version of Kdenlive et MLT, and PPA ones (ppa:sunab/sunab2)
- I have 8Gb of memory , and a Phenom quad core.

Versions (currently, but tried older ones) :
- MLT melt 0.5.10
- Qt : 4.6.2
- KDE 4.4.2
- Kdenlive : 0.7.8
- FFmpeg SVN-r0.5.1-4:0.5.1-1ubuntu1
- libavutil 49.15. 0 / 49.15. 0
- libavcodec 52.20. 1 / 52.20. 1
- libavformat 52.31. 0 / 52.31. 0
- libavdevice 52. 1. 0 / 52. 1. 0
- vlibavfilter 0. 4. 0 / 0. 4. 0
- vlibswscale 0. 7. 1 / 0. 7. 1
- libpostproc 51. 2. 0 / 51. 2. 0


Project :
- My project is mainly composed of
- AVCHD
- DV
- MP3s
- Lots of still images from cameras (different resolutions)


I also tried to add noimagecache property in my mlt file, with no success.
I tried to render to almost all the available formats (HDV, DV, xvid, MP4 etc) with no success.

Please help me, I really felt in love with Kdenlive ergonomy, but having to render parts by parts is really a pain !

MasterBOX

I just made a test project about 2.5 mins long with a sequence from 18 photos, followed by a little DV, followed by a little AVCHD, with short transitions between them, and some audio fades. Then, I added Ogg Vorbis music on an audio track. Rendering to 8 mbps h264 MP4, and it stayed around 250 MB resident until it got to the AVCHD to when it jumped up to 452 MB resident and never went beyond that.

Please file a bug, assign it to me if you can, and attach the project file.
Meanwhile, I will make a test with more AVCHD.

Thanks I'll do that.
I'll first reduce my project to be as little as possible and still consume too much memory.

I think I found more precisely where my problem is. It has to do with the composite transition I abuse.
I tried to create a short clip with only pictures and composite transition with black, and I immediately hate the memory comsumption going crazy.
Unfortunately I really need this transition...

I'll fill the bug report.

Thanks !

MasterBOX

In fact this is using composite transition in conjunction with maskOmate effect that is provoking the problem.
Without maskOmate effect, rendering is really faster and memroy usage is ok...