examples:
":": maximum verbosity for all the log domains"*:-": don't print any message"media-source:debug,metadata-source:debug": prints debug,
info, message warning and error messages for the media-source and
metadata-source log domains
It's possible to override the log configuration at runtime by
defining the GRL_DEBUG environment variable to a configuration string
as described above
Configure a set of log domains. The default configuration is to display warning and error messages only for all the log domains.
The configuration string follows the following grammar:
examples:
":": maximum verbosity for all the log domains
"*:-": don't print any message
"media-source:debug,metadata-source:debug": prints debug,
info, message warning and error messages for the media-source and
metadata-source log domains