Good one. Thanks Dave. I’m a bit surprised it doesn’t work as smoothly for me using an Apple USB-C SD card reader
You're very welcome, Mark.
If it's the pause/latency you're talking about, without testing more I'd guess that LumaFusion will vary that latency depending on the resolution and frame rate of the project and media and where the media is being edited from, internal storage, external SSD, external SD etc. and how good/fast the storage medium and readers/drives are.
Interestingly, LumaFusion doesn't seem to pre-buffer where the play head is, only once you hit play. This is evident with the latency with playing after moving the play head. Once in play and you pause the next play command from the same paused position will have a lot less latency, as LumaFusion has already built a video buffer from the previous play but it's not as instant as other NLEs. Once any movements or changes have occurred it has to rebuild the buffer after the next play command and the latency once again increases.
I assume this buffering latency is just what LumaFusion does and it isn't being caused by iOS as the same happens on MacOS with LumaFusion and that's regardless of inter-frame or intra-frame sources.
I'll do a video at some point that does a basic explanation about the video buffer and specifically why LumaFusion does that pause after hitting play, it's on my list of things to do about LumaFusion. I have to be careful about how much time I spend on videos that don't get many views but I do have a list of things I'd like to show with LumaFusion.
That USB C hub that I use is quite an odd one. Aside from external USB SSD and USB C access, that hub is just as good as a Thunderbolt one. The SD card interface on that hub just happens to be a good one. I have tried many hubs and cables with the iPad Pros and the performance varies quite a bit. That hub is definitely the best I've used so far. I use it for iPad Pro game capture as it seems to fully support DP Alt Mode and gives a full height 4K/60 output.
How does your Apple USB C SD card reader respond?