These are complements of sense verbs (the first case discussed in this answer) and have a number of peculiarities. Of particular interest is the fact that the non-volitional sense verbs can take all four varieties of complement.
There is minimal or no difference between the meanings of
- He saw me talking to her.
- He saw me talk to her.
because of facts about vision and conversation, and the usages of complements.
- He saw me talking to her means he witnessed my conversational activity with her.
- He saw me talk to her means he knows that I talked to her because he witnessed the event.
In other words, if he saw one, he saw the other. This is not necessarily true for all predicates;
i.e, He saw me running the marathon does not necessarily mean He saw me run the marathon