Topics and tips about the output of video from a Kdenlive project

Trying to render a .mov and keep it under 750 mb

I'm trying to take a 400 MB .mov file from a Kodak Zi8 and import it into Kdenlive in order to add a couple of jpgs as well as a 15 mb audio file into a separate audio track. I first tried to render it to just a plain .mp4 ( but not the H.264 Mp4 format ) It took two hours to render it and the total video is only 20 minutes. Does that sound correct? Since the file from the camera is a .mov should I render it as a H.264 and go thru the process of creating a new profile so the finished product comes out as a .mov too?


"render" with same settings as input clips

when I have a project that uses various clips from my camera, I'ld like to cut and arrange them a bit, then render the output video with the exact same settings as what my input is, so that there's no quality loss, and also no need to do heavy computations.


Rendering woes in ubuntu 12.04 precise

I've been using kdenlive with wonderful success with ubuntu 10.04LTS. I recently upgraded to 12.04 precise, and had to work through several rendering issues.

1) Random crashes when rendering (rendering aborted). I could get lucky and get a short file rendered, but any video over a few minutes in length would always crash. The crashes seemed random--different file sizes on different attempts. I tried several output formats. I first tried the standard ubuntu packages, then sunab's ppa kdenlive-svn (kdenlive-release ppa apparently doesn't exist for precise yet!), and finally my own build of everything using the very nice build script ( No luck for any...random rendering aborts.


Instant crash (Floating point exception) when clicking render

I was unable to register at the bugtracker (still haven't received no e-mail, and there doesn't seem to be any way to post to there without it), so posting this here.

Clicking render crashes instantly on Ubuntu 12.04. This goes for both and 0.8.3. Doesn't matter if there is a project open or not.

Signal: Floating point exception (8)
Qt: 4.8.1
KDE Development Platform: 4.8.2 (4.8.2)

Crash dump:

- Chris


Subs delay after rendering


so I've made a project with KDEnlive version 0.8.2 and then I had to edit it again in 0.8.3 and so it was imported etc. etc.
Now, when I render it, the subtitles (title clips) do no match their positions on the timeline and thus not the speech in the video. What could be the issue here?

thanks for the help!


multi-track compositing doesn't render correctly

I have 5 video tracks and have composited them so that the first 4 tracks are at 45% in each corner and the 5th is background.

The project monitor plays back exactly as required.

When rendered (Youtube, 1 pass 1280 x 720 px) , the very first frame is correct, but after that the first three corners all have track one, and the fourth corner has track four.

I can't see what I've done wrong. Any suggestions?


Kdenlive hang during rendering

Hi Team,

I was trying to render a video comprising of photo slide show and an MPG video clip of 25fps and 640x480 resolution. The project settings are 720p HD with 29.97fps and H.264 encoding. The rendering happens smoothly until it reaches the point of rendering the MPG clip. The kdenlive rendering hangs and it seems like melt is stuck somewhere. I understand that MPG video I use is causing the problem. So I re-encoded MPG clip to h.264 with 29.97 fps and 720p resolution independently and tried to render again entire project with re-encoded clip.


M2T files and duration

I generated a 1920x1080p @ 25fps HD clip according to these instructions:

I can play it OK in Movie Player on Ubuntu 10.04, but it says the duration is only 5'19" instead of what it actually is. FFMpeg reports the duration as 00:24:33:00, which is correct. When it gets to the end of the slider at 5-1/2 minutes, it continues to play.


Rendering Results emtpy file when Transaction is inserted (Title Clip problem)

I am rendering (h264) without problems but when I add a Title Clip and composite transition, rendering results empty file without any errors. The same result is given changing the Transition to any other type I tried.
Also generated a script and executed from shell but the result was the same. No error mentioned, empty file created.

Any help would be appreciated..

KdenLive Version
KDE -Platform Version 4.8.2 (4.8.2)
Ubuntu 12.04LTS


Rendering broken

xubuntu 12.04 RC

Rendering ends 0 seconds in and produces a 0 byte file. There are no errors.

Running the script acts exactly the same, and produces this output:

//STARTING RENDERING: false , false , "/usr/bin/melt" , "/home/j/.kde/share/apps/kdenlive/profiles/customprofile0" , "avformat" , "-" , "/home/j/kdenlive/scripts/" , "/home/j/kdenlive/untitled.webm" , () , ("acodec=libvorbis", "ab=128k", "ar=44100", "aq=50", "vcodec=libvpx", "minrate=0", "vb=8000k", "aspect=@16/9", "maxrate=16000k", "g=120", "qmax=42", "qmin=10", "threads=1", "real_time=-1") , -1 , -1
Started render process: "/usr/bin/melt" "/home/j/kdenlive/scripts/ -profile /home/j/.kde/share/apps/kdenlive/profiles/customprofile0 -consumer avformat:/home/j/kdenlive/untitled.webm progress=1 acodec=libvorbis ab=128k ar=44100 aq=50 vcodec=libvpx minrate=0 vb=8000k aspect=@16/9 maxrate=16000k g=120 qmax=42 qmin=10 threads=1 real_time=-1"



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