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  1. Multimedia storyteller bigass's Avatar
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    Capturing some VHS with USB3HDCAP, Virtualdub and MagicYUV, I get a file that plays OK intially, but if I move around the file, the audio pitch drops. This happens in VLC, MPC-HC and in Virtualdub.

    Chain is AG1970 (NR switch to edit mode, TBC on) -> TBC-1000 -> USB3HDCAP by SVideo -> Virtualdub -> MagicYUV 422. Attached file was extracted in Vdub2 with direct stream copy.

    What do you see going wrong?
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  2. aBigMeanie aedipuss's Avatar
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    have you tried using ut codec, huffyuv, or lagarith? all free and have worked perfectly for years without having to pay for it like some suspect "magicyuv". just the name gives me doubts. magic my ass, it's probably stolen open source code.
    --
    "a lot of people are better dead" - prisoner KSC2-303
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  3. Member dellsam34's Avatar
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    The colors are off scale but that's mostly source related, I would remove the TBC1000 just to see the difference, sometimes external TBC's slightly change luma and chroma levels even though they are not suppose to, but electronic components drift over time and that mandatory ADC-DAC conversion inside the TBC could screw things up.
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  4. Multimedia storyteller bigass's Avatar
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    Originally Posted by aedipuss View Post
    have you tried using ut codec, huffyuv, or lagarith? all free and have worked perfectly for years without having to pay for it like some suspect "magicyuv". just the name gives me doubts. magic my ass, it's probably stolen open source code.
    Yes, I have tried the others, other than UT Codec. I appreciate your lack of faith in the codec, as codec names usually correspond to their performance and usability, but according to popular web site "VideoHelp," it's been around for some time: https://www.videohelp.com/software/MagicYUV/version-history

    Does anything in the example file give insight into why the audio pitch would drop on playback?
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  5. Multimedia storyteller bigass's Avatar
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    Originally Posted by dellsam34 View Post
    The colors are off scale but that's mostly source related, I would remove the TBC1000 just to see the difference, sometimes external TBC's slightly change luma and chroma levels even though they are not suppose to, but electronic components drift over time and that mandatory ADC-DAC conversion inside the TBC could screw things up.
    Thanks, Dellsam. I'll see if bypassing the TBC could change something. Does anything you cited explain the audio pitch shift on playback?
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  6. Member dellsam34's Avatar
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    I had not noticed that, I though it was a freeway traffic noise.

    How does it play directly to TV from the VCR?
    Last edited by dellsam34; 17th Nov 2020 at 13:09.
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  7. VirtualDub has the option to resample the audio when it's having sync problems. That can cause a change in pitch. See Capture -> Timing...
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  8. Multimedia storyteller bigass's Avatar
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    Thanks, jagabo, for that. That page presents many ways for me to mess things up, I bet.

    I had audio preview on when I made this capture. I read a few moments ago that I should absolutely NOT have audio preview on. Another of those Things Everyone Knows that I wasn't aware of. I've just made three test recordings that I'll dig into to see whether the tweaks you suggested, and/or turning audio preview off, has given me something more sane.
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  9. Multimedia storyteller bigass's Avatar
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    jagabo, I'm not sure whether it was one of the settings you pointed to, or a reboot and turning off audio preview, but I'm back to getting decent captures. Thank you for your assistance.
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  10. Yes, turning off the audio preview is critical with VirtualDub. It causes frame drops which in turn causes the sync options to kick in.
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