I wouldn't say that the replay would necessary be inconclusive... Unless the situation involved a dispute where what a player said came into question, the audio may or may not be needed to review the situation. If the video is not very helpful, then you would have to do your best to make the judgment call since that is what you would have seen had you been at the table anyways!

On a related note, I was thinking a lot of problems could be solved (not necessarily this one but others that involve players misconstruing wagered amounts) if players were given the incentive to complete their betting actions by moving the correct number of chips in front of them before subsequent players act. What would happen if we required players to ensure that chips associated with any wager made are to be pushed forward in the correct amount and made clearly visible for all players to see, AND before the next player acts, and failure to do so may result in their wager being misinterpreted? For example, if a player is all-in, they should push their stacks forward if no all in button is being used, and not just leave the call amount in front...or when they are raising, they should be counting the full amount of their wager out and pushing it forward before the next person acts... Or similarly when they are calling, they should move the amount if the call forward promptly before the next person acts so that it is clear that a call was made and he still has cards. In other words, any verbal bet, while binding, should be followed up with the matching chips moved into the pot ASAP.
Just thinking out loud here....
If poker is considered a visual game, we should ensure that all bets are always clearly visible and in the correct amounts (this also means that when the amount is visually different from the wager e.g. Using oversized chips, it is even more important that the dealer ensure everyone is aware of this... Or use a "change coming" button...

. If we were able to use "change" buttons, all-in buttons, and force all other wagers to be pushed forward and to be exact, think of how much easier our decisions would be? If a player makes a betting irregularity because he claims he didn't know that a player bet X, we could simply point to the bet out in front and he no longer has an excuse. And if for some reason the bet was not put out or did not match, we have a good excuse to provide some relief under Rule 1. Although we may do this currently anyways, the rules don't explicitly put much of an obligation on bettors to follow up with putting the correct number of chips into the pot quickly.
Sorry for the long spiel... Just thought I would put it out there. I'm selling "change" buttons if anyone is interested.
