PushSrc Framerate Synchronization

[Maurice Ackel]

Hi there,

I’m fairly new to GStreamer and currently trying to build a live PushSrc element. I’m a bit confused about the synchronization of the „fill“ function to the frame rate of the pipeline. I thought that it might be enough to negotiate a certain frame rate and then the PushSrc base class would call the fill function in this interval. However, this seems not to be the case. So what I am wondering now is two things:

1. How does an element determine when to call the fill/alloc/create function?
2. What do I need to do in order to sync my fill function to the pipeline frame rate (i.e. wait for a new frame time to do my capturing, etc.)

Thanks!
Maurice