[Varstahl]

So is this related to the amazon plugin, to Kodi or inpustream adaptative ?

any idea on how I could debug this ?

I'd say 90% is the distro, with 10% Kodi. If the file plays back then it's not a DRM issue, it's a decoding issue. So then comes the "what does the raspbian do to decode the video streams". You might need to try and look into ffmpeg decoding in Kodi and/or debian. LibreElec has codecs and configurations to run well in this kind of scenarios, but I don't know enough to point you further in the right direction.