Make sure that eye cameras stream @ 200 Hz

[phausamann]

Pupil's developer docs refer to a patched version of libusb that is required for streaming @ 200 Hz. The patch seems to be minor: libusb/libusb@master...pupil-labs:linux so we could easily adapt the conda recipe for libusb to include this patch.

@marklescroart @KamranBinaee could one of you check whether 200 Hz streaming works as is? I don't have the second gen eye cameras unfortunately.

[KamranBinaee]

@phausamann I ran a few minutes test on the 200 Hz stream. The eye videos couldn't go above 65-67 Hz and the world (FLIR) was bellow 3 Hz. Although I should also say that I tested this while my laptop was <20% battery and I have seen a significant performance drop when it's on low battery. So either the laptop resources can't keep up or the bandwidth doesn't seem to fit what we have. I'll test this on my desktop and also the fully charged laptop hopefully soon.

[phausamann]

Thanks @KamranBinaee. To verify that issues come from libusb we should check streaming only the eye cameras first, i.e.

vedc show eye0

and

vedc show eye0 eye1

[phausamann]

Here's what needs to be done:

• @KamranBinaee or @marklescroart set eye camera parameters to resolution: (192, 192) and fps: 200 and make sure that vedc show eye0 eye1 reports 200 Hz for both streams

[phausamann]

@mrgreene09 reports that frames are coming in at 200 Hz but there's no image data. @marklescroart @KamranBinaee can you reproduce this?