Segfault while running video_decode from multimedia-samples

[freeman94]

Segfault while running video_decode from multimedia-samples

[danielfullmer]

I'm not able to reproduce the failure in the same way you're seeing.

When I run it, it fails when trying to render to the display, likely because I don't have X11/wayland running on this device)

$ /nix/store/m010m4has2b691fwzpdp212c42hxzz13-multimedia-samples-35.3.1-20230319081403/bin/video_decode H264 sample_outdoor_car_1080p_10fps.h264 
Creating decoder in blocking mode 
Opening in BLOCKING MODE 
NvMMLiteOpen : Block : BlockType = 261 
NVMEDIA: Reading vendor.tegra.display-size : status: 6 
NvMMLiteBlockCreate : Block : BlockType = 261 
Setting frame input mode to 1 
Starting decoder capture loop thread
Video Resolution: 1920x1080
Video SAR width: 1 SAR height: 1
[ERROR] (NvEglRenderer.cpp:98) <renderer0> Error in opening display
[ERROR] (NvEglRenderer.cpp:154) <renderer0> Got ERROR closing display
Segmentation fault (core dumped)

One possible difference, is I tested on 23.05, not nixpkgs master.

[freeman94]

Try running with the --disable-rendering flag.

[danielfullmer]

Ah, nice. I didn't notice that flag. In that case, yes, I can reproduce the segfault. In my case, it still seems to get slightly further and output these lines:

Video Resolution: 1920x1080
Video SAR width: 1 SAR height: 1

but it then fails with a very similar backtrace.

[freeman94]

Beginning to think this may be a red herring. I have carefully gone through the samples to go h264 -> YUV -> h264 as expected (using decode_sample/encode_sample). I came across this originally after seeing the same segfault in (non-nvidia) vendor code. I will try other options and report back.