How would audio/video format solve the problem though?<p>A lot of communities have been moving to chat platforms like Discord, Slack, etc. They definitely help to get a faster answer.<p>But in any case, responsiveness depends on the community health and on how well the question is prepared and clear.
I sometimes ask on Usenet or on IRC. IRC messages may get lost (although they may also be answered more quickly if there are enough users); Usenet messages are unlikely to get lost (although they may expire, someone will probably still have a copy, and in general you can still post a follow-up message to an expired article). But to try to more likely to get an answer, would be asking in more than one place, I suppose. (I think that audio/video would make it worse, though; text format would work better for these kind of things, I think.)