stream in udp multicast from local loop file

I'm searching a solution to stream endlessly a file in h.265 over multicast/udp in mpegts. Is this something nimble server could do? As I can see it doesn't appear to be possible

You can use Live transcoder to produce stream from a file: https://blog.wmspanel.com/2017/01/bind-unsynced-video-audio-transcoder.html . However, it will need to be decoded and re-encoded continuously, so I would not recommend this. Instead, you can use FFmpeg to send stream from file:
ffmpeg -re -stream_loop -1 -i video_hevc.mp4 -c copy -f mpegts udp://ip:port
Notice that stream_loop has some issues with MP4 files, it's recommended to convert it to .ts first:
ffmpeg -i video.mp4 -c copy -f mpegts video.ts

Thanks for the reply. FFMPEG is what we currently use, but it doesn't output a compliance MPEGTS files. the timestamp is going backward everyloop and it make multiple pts error so the equippement that we use on the network doesn't like the mpegts/udp produced, so we are searching another solution. I saw multiple post that indicate FFMPEGhas MPEGTS packetizer broken. I was hoping to be able to try Nimble.

In this case you can push stream to Nimble over RTSP and setup Nimble to send it over UDP, as described in this article: https://blog.wmspanel.com/2015/07/advanced-mpegts-delivery-udp-nimble-streamer.html
To push RTSP stream to Nimble you can use this command:
ffmpeg -re -stream_loop -1 -i video_hevc.ts -c copy -f rtsp -rtsp_transport tcp rtsp://nimble_ip:port/live/stream1