channel expression?
The ytchannel: predicate allows your application to perform a search and get only video results from the specified channel. For example, a search expression of ytchannel:BarackObamadotcomwill return a collection of videos from the BarackObamadotcom YouTube Channel. By providing an additional, optional expression right after the ytchannel directive, your application can search for the expression within the selected channel, e.g., ytchannel:BarackObamadotcom oil.