strace shows nothing during playback

[vLx]

Hi,
Apologies if this is not the best place to make this question.
I'd like to see vlc's system calls, and I'm especially interested in how vlc gets the current time or waits for the next frame.
When I run vlc under strace I don't see any system calls at all while playing a video. What gives? Can someone help?

Thank you!

[Rémi Denis-Courmont]

Tracing the wrong thread(s) or process(es).

[vLx]

Now I realize how silly I was. Apparently trace only traces the main thread by default, requiring -f to show all threads.

Thank you!