Looking For A Video Editor that will maintain the codecs of the original source video
In many instances you can use ffmpeg to create a clip out of a longer clip, and request that the original frames are copied instead of re-encoded. 

I'm writing this from memory so you may want to double check, but I believe the command line options you need to use for this are:

ffmpeg -i &lt;source-filename&gt; -vcodec copy -acodec copy -ss &lt;start-position&gt; -t &lt;duration&gt; &lt;destination-filename&gt;