Difference sample-based & client-based streaming. Simultaneous AHAT & PV

[anjelomerte]

Hi jdibenes, just testing your repo. Documentation is great! Got some questions again:)

In simple_recorder.py it say that "Simultaneous PV and RM Depth AHAT streaming is not supported [...]". Is that true? If so, why is that? It is definitely possible to access both simulatneously on the HL2.

Running client_stream_pv.py and client_stream_rm_depth_ahat.py at the same time works fine.
Combining client_stream_pv.py and e.g. sample_si_rm_depth_ahat.py does work for a couple of seconds, then it freezes.
That also got me wondering what the different in streaming approach is between the sample[...].py and client[...].py implementations?

Edit: Just stumbled across sample_pv_depth_ahat.py which streams near depth ahat and pv simulatneously. Am I missing something?

Edit: Forcing simultaneous streaming of pv and depth ahat works in sample_vide.py. Are the comments simply deprecated or will there be problems on the way?

Thanks a lot!

[jdibenes]

Hello,
The comments are deprecated, PV+AHAT did not work in some older OS versions (microsoft/HoloLens2ForCV#133).
For the sample[...].py scripts that use multiple streams, the main difference is that we use multiprocessing (producer, consumer in hl2ss_mp) to get around the global interpreter lock.
When the scripts froze did they throw any errors?
Both client_stream_pv.py and sample_si_rm_depth_ahat.py use a lot of network bandwidth so it's possible they stopped working due to network conditions.

[anjelomerte]

Hi, thanks for the insights! Makes sense now. No, I got no errors, the streams just froze.