Since Reaper use ffmeg, i had a look at the below link
https://ffmpeg.org/ffmpeg.html
It's explained that it's possible to use copy stream instead of encoding. From a command line perspective it's easy. I guess in the worst case i need to find an 'dummy encoder' that only copies the stream.
In that way reaper doesn't need to do anything special to achieve this.
Regarding using a dedicated video editor....
i tried a couple but many inc adobe don't support mkv which all my source files are in. if mkv is supported they don't support multiple crops and queued processing.
The best i could find was Bigasoft total video converter.
It's nice software but Reaper has a realy nice GUI for making multiple regions in one mkv file. In my case it's really useful to see the soundtrack so i know where to mark the video. If somebody can recommend an editor who can do all this i will be grateful too.
Regarding using lossless video format,
Yes I am donig that but it takes a long time, i have many large files and the overhead is huge, i waist a lof of time, first decode from mkv (Mediainfo shows Codec ID: V_MPeg4.ISO/AVC) to lossless format and then encode again
I am also thinking of experimenting with making regions, export to csv and import this in MKVToolNix but it seems combersome.
However i suspect that somehow with a small nifty trick this should be possible in reaper. If i could only install a dummy encoder which copies the audio and video....
i would be grateful for a more simple solution
Thanks