I’m seeing memory-related crashes when playing videos sliced (with ffmpeg -c copy) from mp4 streams (downloaded with youtube-dl). I’m attaching a sample clip which, granted, is pretty useless for a video, but which produces these crashes with 100% certainty for me; I just edited it down to a reasonable size and non-infringing content.

The errors reported just before core is dumped are (mostly) ”double free or corruption (fasttop)” or (less often) ”malloc_consolidate(): invalid chunk size”.

To be clear, my expectation here is not for the problematic clips to have useful content, or even to play back; just that vlc didn’t crash. (Totem for instance does not seem to crash with the same files.)

I’ll attach logs for both the double free and malloc_consolidate cases (which I’m producing by running LC_ALL=C vlc -vvv out.mp4 in a loop).