Hi Cenwen,
thanks for your reply.

I add the copyright protected original photo to this posting for you for testing purposes only.
Copyright (c) 2013 Michael Paul Korthals. All rights reserved.

To play the test video in firefox fails. I do not know why.
Please download the test video to your video folder. 
Select Full HD 1920x1080 screen resolution on your system.
The try some of these commands in a terminal, depending on, which video players you have installed on your system:
(replace %s by the absolute path to the test video)
avplay "%s" -fs
ffplay "%s" -fs
mplayer -fs "%s"
totem --fullscreen "%s"
vlc "%s" -f
On my Ubuntu 13.10 'saucy' it works.

I did not not really understand the 3rd paragraph of you posting and I feel that I shoud explain my goals to you:

I'm a hobby photographer. I'm inspired to document the beautiness of nature for the future in a timeless way. Here is my open artwork:
http://www.youtube.com/user/MichaelPaulKorthals

My camera is a Cannon 600D (Photo: 18 megapixels; Video: 1080p 40MB bitrate; Audio: Stereo 16bit PCM uncompressed).

Up to know I produced my videos in windows using ImageMagick, ffmpeg, mencoder using my private production line scripted in AutoIt.

Currently I am working to build up and to maximize the quality of my private video production line in Linux. My current artwork task list contains productions of  high quality  videos from my basis material from Iceland (a lot of more issues) , South of England, Istanbul  and Austria  ("Danube Meadows National Park" in four seasons). 

I now integrated OpenShot into my production line, because it is easily to use for timeline, crossfades and titles. Thanks for your ingenious work. 

The KeyframeEditor I use for the high quality pre production of clips and as high quality video export final stage.

My production quality level for video is 1080p lossless .png image sequence  and for audio lossless 16 bit PCM stereo 48 kHz uncompressed .wav. My current video export quality level  for the video player is this: 

avprobe version 0.8.9-6:0.8.9-0ubuntu0.13.10.1, Copyright (c) 2007-2013 the Libav developers
  built on Nov  9 2013 19:15:22 with gcc 4.8.1
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MVI_4911.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf53.21.1
  Duration: 00:00:27.02, start: 0.000000, bitrate: 39910 kb/s
    Stream #0.0(und): Video: h264 (Main), yuv420p, 1920x1080, 39621 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    Stream #0.1(und): Audio: mp3, 48000 Hz, 2 channels, s16, 320 kb/s

Fast rendering is no requirement for me. I have much time to render the end results. Normally I let render overnight and I enjoy my end result videos next day at breakfeast time.

Because OpenShot 1.4.3  does not meet my requirements for a comfortable keyframe editor and the video output quality, I created KeyframeEditor to reach the quality level, I currently imagine.

My strategic goal is:  Less coding -> more artwork at maximum quality level Full HD. So I allow you to use the features design and phyton code I produced for the KeyframeEditor and it's video export final stage to enhance OpenShot. I would be glad, if OpenShot 2.0 would fullfil my quality requirements completly. This would be more efficient for me, because, in this way, I does not need to treat my additional tools any more.

In this way I'm interested in your OpenShot 2.0 phyton library. May be it contains some further possibilities I could integrate in my new private video production line. Where or when I can find it?

Thanks for your hint regarding ffmpeg. I try to determine if to install ffmpeg rises the quality of OpenShot 1.4.3.

Now I hope to finish my next Iceland video "Iceland Elements - Seeds of the Wind" in the next weeks. It will be my first work on my new production line including OpenShot for the first time.

Kind regards
Michael Paul