So it turns out the I/P Mode on a Sony PVM-2541 is greyed out when fed a progressive signal. It is only active when fed interlace or Psf signa
If I set the video output hardware to HD then in the Avid DnxIO video desktop I can select Psf output and the I/P mode is no longer blacked out, Sony blacks out unavailable function on the monitor so greyed out is not applicable here.
The kicker is when fed Psf I can set the monitor to IntraFrame mode, the fastest processing, and using my Sync Check the the video is only .3 to .5 frames late. Unfortunately if I set the video hardware to UHD so I can feed HDMI in 4K and take the spigot 3 and 4 on the DNxIO for an HD downconvert the signal is progressive as there is no Psf in UHD. This results in video late by over 1.5 frames. I have some behringer audio delay boxes but they introduce hum and I never figured out a way around that.
It seems when fed a progressive sdi signal the PVM-2541 defaults to the more lengthy processing of the InterFrame I/P mode. Or is there something about how the monitor processes the progressive signal that causes the delay. It seems weird because in Psf mode it's really close so why would the sdi being progressive delay the processing so much. It's the same amount of info just fed sequentially instead of serial. I guess I'm not sure how the monitor scans the screen. I get that Psf facilitated tape decks designed more for interlaced signals to begin with but why does the SDI video signal scan type effect monitor video delay so much.
I know that newer A250 models eliminated the I/P Mode control. I'm monitoring the embedded audio out of the PVM-2541. If only sony had delayed the audio out of the monitor to sync with the display delay. Maybe that's what they started doing in later models. Taking the audio straight out of the DNxIO instead of the monitor audio out only changes the offset about 4 milli seconds.
Oh well life once again is plus or minus 2 frames.
---In Avid-L2@yahoogroups.com, <bigfish@...> wrote :
Thanks for checking. They didn't change the software version as I asked them to let me know if I was up to date and they told me there hadn't been an update since the flicker free mod. I did find in the manual that controls that are blacked out aren't available. It mentioned key inhibit but that's not on so there must be some other reason these aren't active now.
---In Avid-L2@yahoogroups.com, <Greg@...> wrote :
---In Avid-L2@yahoogroups.com, <Greg@...> wrote :
I had one of mine repaired and the menus seemed different afterwards- including not being able to find flicker-free. I never use that so I didn't give it much thought.
Nowhere near the monitor now, but I will compare software versions with another that I have...
On May 26, 2019, at 03:10, John Moore bigfish@... [Avid-L2] <Avid-L2@yahoogroups.com> wrote:
I own an old Sony PVM-2541 that didn't originally have the Flicker Free mode. Sony added that for free many years ago. I just had the monitor professionally calibrated but the audio sync seems off. I went to check the I/P mode in system settings and it is darkened with a dash like it's greyed out. I tried turning flicker free off but it is still greyed out. Rather than show a mode it just shows a dash. I haven't looked at this in years so I'm wondering if the calibration, done with calman software, or something got updated with the flicker free mod that deactivated this setting.I know more recent models like the a250s don't have this setting. So would the flicker free mod have deactivated this. I don't know why it would. Or could something in the calibration process locked this out. Or am I just missing the right menu setting to activate it? I've googled but haven't found anything in the menu about why I no longer see the choice.John Moore Barking Trout Productions Studio City, CA bigfish@...
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