Inconsistent frame rate, Tevion ATI clone, Windows 11?
 

Yes, I said Windows 11. I know that it works just fine in Windows 7 and I have the capabilities to keep using it with Windows 7, but I'm trying it out with Windows 11 anyway.

I had no problems installing the eMPIA driver and the huffyuv codec. The video and audio comes through fine in Virtualdub, but the frame rate keeps jumping between 24fps and 30fps without staying consistent. As you can imagine this causes Virtualdub to add frames when capturing and makes the playback of a captured file a little jittery. Even before capturing to a file the video display is jittery because of the inconsistency in frame rate.

Does anyone have any clue as to what could or potentially could fix this problem? It may be a losing battle with Windows 11 and if that's the case then so be it, but I'd still like to try and resolve this if possible because the convenience of using 1 PC for it all would be fantastic!

Here's the PC specs (it's a new build):
-Ryzen 7 5700X processor
-16gb (8 x2) Patriot Viper Steel DDR4-3200 ram
-XFX AMD RX-580 XXX GTS 8gb gpu
-ASRock Phantom Gaming 4 motherboard
-AMD X570 chipset
-I have two NVME SSD and the two HDD from the Windows 7 computer I captured to
-Windows 11 Home 23H2 build 22631.2715

Don't capture in Windows 11...

Such a response is irrelevant until every possible solution has been exhausted.

As it turns out, I got it working fine. I stumbled upon this thread and used the vidbox driver included and now my frame rate is consistent with no inserted or dropped frames. https://www.digitalfaq.com/forum/vid...er-tevion.html

As far as I can tell the video and audio are coming through like it should. See the attached sample.

Start by setting the sampling rate of your audio capture to 48000Hz, not 96000Hz.

You're absolutely right. I don't know how I missed that. Frankly I got it working and then went about doing some other housework. Thanks for pointing that out to me.

I accidentally found that driver workaround.
Even a blind crab finds an oyster once in a while.

I've tried that driver on Win10, but in my case it didn't seem to actually output interlaced video - it was like it either threw away one field per frame or did some sort of combination of fields. What program were you actually using to capture? Are you sure it's actually interlaced initially if you say capture a small lossless clip?

You can kind of see in the screenshot if you look at individual frames that something funky is going on with the deinterlacing - so I wonder if that is from the card or the way that it was deinterlaced after capture? For me, it just wouldn't output interlaced at all in Win 10. Also what VCR did you use and what cable connection? Looks pretty decent and audio also is pretty good. Was that an SP or EP tape?

Yes, it's definitely interlaced at capture. I use VirtualDub with the Huffyuv codec. I have the recommended Tevion ATI clone usb capture device. I'm using a simple Sony Hifi vcr (SLV-788HF) over composite as I don't have a higher end vcr with S-video yet. I converted to MP4 with Hybrid using Lordsmurf's recommended settings and having it deinterlace with avisynth. The video is a commercial release from 1985 by the band DeGarmo & Key titled Visions of the Light Brigade.

Praise the Lord you did! It's much appreciated on my end!