The problem is solved by applying the mentioned solution.
The order of the parameters is very important on ffmpeg.
Try this:
ffmpeg -ss 00:36:18 -i input.mp4 -vcodec copy -acodec copy -to 00:39:50 output.mp4
It seems that setting the -ss parameter before -i sets a keyframe at the beginning of the newly generated video.
Or so I understand from the Wiki page here.
Can you post an update ?
Thank you for your interest.
Edit: This not a solution. Sorry. With this change, the video duration became longer.
There is a problem mentioned in the topic.
https://video.stackexchange.com/questions/16516/ffmpeg-first-second-of-cut-video-part-freezed
The problem is solved by applying the mentioned solution.
Can you post an update ? Thank you for your interest.
Edit: This not a solution. Sorry. With this change, the video duration became longer.