I thought I should mention here that my favourite video player software, mpv, was recently improved to be able to directly replay...
V-Log video material, applying the inverse transformation on the fly, as well as tone-mapping and color-space conversion.
This allows you to review video clips as recorded e.g. by a GH4R directly, without having to go through a lengthy "video editor software import / rendering cycle".
For example, to replay this sample V-Log video file posted by a forum member earlier, you could use an mpv command line like this:
mpv --vf=format=gamma=v-log:colorlevels=full:primaries=v-gamut -vo opengl-hq:hdr-tone-mapping=clip SHOGUN_S001_S001_T008b.mov
... to obtain a video display like this:
Please notice that both HDR and V-Log display transformation support are implemented in the OpenGL video output module of mpv, which is the default to use on Linux/Windows/Mac. If you use another video output module, these on-the-fly transformation features are not available.
This is more advanced thing (for raw)
http://www.personal-view.com/talks/discussion/15474/advanced-dng-player-for-cuda#Item_1
You can contact this guys, they seem to have most elements ready to add also V-Log support and playback of H.264 footage.
It looks like you're new here. If you want to get involved, click one of these buttons!