[Cin] CinGG crash rendering high fps

[mnieuw at zap.a2000.nl]

Playing around with high fps rendering, I got crashes. I don't know if
I am doing this right, but CinGG should not crash. Can anyone
reproduce this? I do not want to make a BT entry if it is something
local. Details:

Machine: CPU AMD 2400G, 32 M ram, SSD storage. Linux Mint XFCE 20.1,
kernel 5.4.0-77 .

CinGG build: from git 20210623 UTC 1830 or so. Build went OK.
Used the executable from the bin directory, not the AppImage.

Format settings: 1920x1080 p120 RGBA, 1 video, 2 audio channels.
Imported 1920x1080p50 yuv420 mp4 video.
Rendering (H.264 vaapi) creates a 120 fps file, which plays fine
quickly tested, but CinGG crashes at the end.

I tried without and with the ffmpeg "interpolate video" filter, both
crash, but with interpolate filter file is 3 times bigger (and the
picture has problems, but that is another issue). Sizes: original 50
fps: 313 MB, 120 fps without filter 1.1G, 120 fps with filter 3.8 G.

Lots of MotionHVScan error while rendering.

MotionHVScan::pixel_search 535 range fail range1=0.140625
** segv at 0x7ffaa64cf032 in pid 8691, tid 10535
MotionHVScan::pixel_search 535 range fail range1=0.136719
MotionHVScan::pixel_search 535 range fail range1=0.343750
MotionHVScan::pixel_search 535 range fail range1=0.152344
MotionHVScan::pixel_search 535 range fail range1=0.136719
MotionHVScan::pixel_search 535 range fail range1=0.578125
MotionHVScan::pixel_search 535 range fail range1=0.292969
MotionHVScan::pixel_search 535 range fail range1=0.191406
MotionHVScan::pixel_search 535 range fail range1=0.132813
writing debug data to /tmp/cinelerra_8691.dmp
MotionHVScan::pixel_search 535 range fail range1=0.148438
MotionHVScan::pixel_search 535 range fail range1=0.390625
MotionHVScan::pixel_search 535 range fail range1=0.425781
Segmentation fault (core dumped)

MatN