Bug Report Follow focus layer slow down 4.7.3 - beta 4.8b4

Follow focus layer starts to slow down the system.
ScreenCast https://disk.yandex.ru/i/iRQrxsC3z5Z7DA

Tested all configuration:
Macbook pro 13, 2017, 16gb, 3,5i7, Mojave
Macbook pro 15, 2017, 16 16gb, Mojave
with

  • Blackmagic UltraStudio Mini Recorder + Panasonic G9, tested 720p30, 720p60, 1080p30 input signal
    OR
  • Blackmagic UltraStudio Mini Recorder + Sony a6400, tested 1080p60, 1080p30 input signal
    OR
  • EZCAP-265C HDMI-to USB-c Card (work as webcam) + Sony a6400 tested 1080p60, 1080p30 input signal
    OR
  • EZCAP-265C HDMI-to USB-c Card ( work as webcam) + Panasonic G9 tested 720p30, 720p60, 1080p30 input signal

output was: hdd record only, 720p30, tested h264 and HEVC

all of these options inhibit the system

I note the observation that after the first start of the program, the follow function works without overload, but literally after several inclusions it starts to slow down again. Perhaps this is a buffer overflow or some kind of stack problem.

Hello @did,

the Rendering Performance monitor shows that the Follow layer is eating up the rendering performance. However it meight not be the problem by this particular layer because I think there is a conversion happening for the BMD Minirecorder that needs to be done to enable the layer to use this video source. This conversion is happening in the rendering engine. You may test this by adding any video filter to the BMD source. This will cause the conversion happening outside the Rendering and should bring the Follow layer to a reasonable performance.

Does this work for you?

Thanx Achim, but we tested also without video desktop (bm driver) and blackmagic minirecorder also. With another usb card.
Same eating :frowning:

  • EZCAP-265C HDMI-to USB-c Card (work as webcam) + Sony a6400 tested 1080p60, 1080p30 input signal
    OR
  • EZCAP-265C HDMI-to USB-c Card ( work as webcam) + Panasonic G9 tested 720p30, 720p60, 1080p30 input signal

There weren’t problems with follow In previous versions at same configurations (dont remember wich ones old versions)