Hi folks ! Thanks for your help Pep. I just got my RPi4 today. I also got an RPi3. I have to do extensive tests RPi3/RPi4/AMD64, SV305/SV305PRO, USB2/USB3. I actually reproduce the issue on RPi4/SV305PRO/USB2. The first frame is OK, but I never get the second one. First observation, for the first frame, we get the usb bulk datas. For the second one, it never comes. First frame usb sniffing : d8139900 1127851687 S Ci:1:006:0 s c0 d0 0001 3000 0001 1 < d8139900 1127852168 C Ci:1:006:0 0 1 = 08 d8139900 1127853454 S Ci:1:006:0 s c0 d6 0001 0080 0001 1 < d8139900 1127853916 C Ci:1:006:0 0 1 = 08 d8139900 1127854089 S Ci:1:006:0 s c0 d0 0000 3000 0001 1 < d8139900 1127854550 C Ci:1:006:0 0 1 = 08 d8139900 1128616063 S Ci:1:006:0 s c0 b9 0000 0000 0002 2 < d8139900 1128616152 C Ci:1:006:0 0 2 = 0113 d8139900 1128816561 S Ci:1:006:0 s c0 b9 0000 0000 0002 2 < d8139900 1128816640 C Ci:1:006:0 0 2 = 0113 d8139c00 1128974084 C Bi:1:006:2 0 4147216 = d91a3203 00000000 01000000 00000000 01000100 01000100 01000100 01000100 d8139c00 1129010255 S Bi:1:006:2 -115 4147216 < The second frame starts the same way : d8139900 1157854005 S Ci:1:006:0 s c0 d0 0001 3000 0001 1 < d8139900 1157854480 C Ci:1:006:0 0 1 = 08 d8139900 1157855768 S Ci:1:006:0 s c0 d6 0001 0080 0001 1 < d8139900 1157856224 C Ci:1:006:0 0 1 = 08 d8139900 1157856399 S Ci:1:006:0 s c0 d0 0000 3000 0001 1 < d8139900 1157856858 C Ci:1:006:0 0 1 = 08 d8139900 1158203763 S Ci:1:006:0 s c0 b9 0000 0000 0002 2 < d8139900 1158203849 C Ci:1:006:0 0 2 = 0113 d8139900 1158404259 S Ci:1:006:0 s c0 b9 0000 0000 0002 2 < d8139900 1158404339 C Ci:1:006:0 0 2 = 0113 But then it loops again and again : ... d8139900 1158604797 S Ci:1:006:0 s c0 b9 0000 0000 0002 2 < d8139900 1158604872 C Ci:1:006:0 0 2 = 0113 ... The camera datas never seem ready. To be continued...Read More...