Just wanted to say I'm having this issue as well. Hoping it gets fixed at some point! I previously used snapshots which worked great, but once I set up substreams, the jpegs are now terrible quality. They are physically the same size as before (2560x1440), but are of substream quality.
So I was having a few random issues with Blue Iris, I was on version 5.3.0.3. My support subscription (and thus updates) expired back in the middle of July, so I decided to renew and get on the latest version (5.3.8.7).
To my surprise, now in the mobile app I could no longer watch clips at 16x...
I guess I am confused on this too.
I purchased BI a little over a year ago, and am thoroughly impressed.
My initial support ended Jan 2 2019. I notice now that my Check for Updates button is grayed out. So...are the minor updates still free?? Or not? Am I supposed to download the update...
My Blue Iris server is also a media box. If I'm watching a movie, but connect to blue iris with my mobile device, a loud "pop" notification sound plays from blue iris. Is there a way to turn this off?