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Probe source

Register name used to load filter: probe
This filter is not checked during graph resolution and needs explicit loading.

The Probe filter is used by applications (typically MP4Box) to query demultiplexed PIDs (audio, video, ...) available in a source chain.

The filter outputs the number of input PIDs in the file specified by log.
It is up to the app developer to query input PIDs of the prober and take appropriated decisions.


log (str, default: stdout, minmax: fileName, stderr, stdout GLOG or null): set probe log filename to print number of streams, GLOG uses GPAC logs app@info(default for android)