TGrabs FATAL: Segmentation Fault about trex

[mooch443]

Thanks a bunch! This was a bug in my TGrabs code and will be fixed in the next release.
Edit: Just so you know - your intuition that it had to do with an empty video was entirely correct.

[MarkJThomas]

Hey Stefan, I am by no way an expert but I had an issue whereby the TGRAB couldn't read some frames of my video and the forced exited the programme. So, after searching for some possible solutions I found one with FFmpeg using terminal:

ffmpeg -i video.mkv -c copy video_fixed.mkv

This seemed to correct the missing frames and then worked after. Maybe worth giving it a go!

All the best!
Mark

[mooch443]

Hey both!

First of all, this can definitely happen with broken videos, and (as @MarkJThomas mentioned above), this can be fixed easily. A lot of video players "ignore" this and skip frames, but TGrabs currently does not. If this is a "real" crash, then I would first ask: Is this reproducible/does it happen every time with the same videos? In that case it would be great to be able to debug it (e.g. if you could provide a small clip that provokes it and the settings you used).

Best
-Tristan

[StefanMPopp]

Thanks for the answers!
Yes, it is reproducible. I have tried copying and reencoding the video with no success.
Could it have to do with the fact that for a while no blobs are detected (because there are no objects to be detected in the frame)?

Here is a short video file that produces the error for me.

TGrabs .settings:
average_samples = 10
averaging_method = max
image_invert = true
threshold = 75
blob_size_range = [0.0001,0.002]
framerate = 25