Okay. I had some time waiting for someone, so I had a look on the MC Server.
Standard View Full Screen works pretty much like Theatre View. If you move your mouse to the top of the screen, the sliders and media buttons should pop down in a box of their own. The when you hover over either slider, volume or timeline, the mouse scroll button should move that slider.
That was true for both live TV and recorded TV.
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However, when the mouse is over a TV video, I also see a difference between live and recorded TV, as you did.
On live or time shifted TV the image is zoomed in and out, and the zoomed percentage is shown at the bottom of the screen.
On recorded TV the image is jumped back and forward on the timeline, and the timeline bar shows at the bottom of the screen.
So I guess the answer to your original question may be there is no way to change the behaviour in live TV. Maybe it is intentional, since recorded TV tends to have had its zoom level set to "Full Screen" by default, and if it is zoomed at all, that information is saved in the [Playback Info] tag associated with the file. Whereas live or timeshift live TV may need to be zoomed to fit the screen properly.
The answer to the problem though, seems to be to move your mouse to the top of the screen, hover over the timeline and then use the mouse scroll wheel. Not quite as straightforward as just using the scroll wheel with the mouse at any position, but it works. Maybe using two of your mouse buttons is a better solution.
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You might like to include in your signature:
The version(s) of MC you are running, and the date you upgraded to it, like my signature.
Your Windows version, including 32/64bit, Service Packs, etc.
Your TV tuner makes and models, how they are connected (network, USB, PCIe), and maybe firmware and driver versions.
Sound card or USB DAC make and model, driver and firmware.
How you control MC, MCE Remote/JRemote/Keyboard etc.
The type of TV reception you are using, OTA, ATSC/DVB-T(2), cable, set top boxes
EPG Source, OTA/mc2xml, Standard, Microsoft
How you are using MC, i.e. Standard View only, Audio and TV, standalone on one PC, no Clients, no network involved (?), Audiophile level music reproduction or just basic playing music (like me
), Blu-ray & DVD playback or just ripped videos. Also, Novice and Experienced user in which areas of MC.
Then anything else that makes sense, like areas of MC you are having trouble with now, areas you have mastered, etc. Some people list their separate audio equipment as well, which sometimes helps and is often interesting.
Those are just ideas. Share what you are happy to share. Sometimes seeing some of the additional information allows people who are helping to judge (guess) your level of technical expertise, and therefore provide answers at the appropriate level. Of course, sometimes we guess completely wrong! But it is a starting point.
In case you are wondering, she whom I was waiting for has changed her mind about what she wants to do today, so I had more time for an answer.