Subgraph Mode

If you need to use subgraph, you can refer to the following example.

Build Subgraph

See \ref subgraph_module.py for detailed reference to how subgraph is built. This example first makes the original video a vertical flip, and then overlays an image.

from bmf import SubGraph

class subgraph_module(SubGraph):
     def create_graph(self, option=None):
         # Build subgraph here

When building a subgraph, you need to enter the name of the input streams into Subgraph’s self.inputs:

# input stream name, used to fill packet in
self.inputs.append('video')
self.inputs.append('overlay')

After that, you need to output the output streams:

# finish creating graph
self. output_streams = self. finish_create_graph([output_stream])

Using Subgraphs

The method of using subgraph is similar to other modules:

bmf.module([video['video'], overlay['video']], 'subgraph_module')

If you need the complete code, you can refer to test_subgraph.py