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  1. 14th Mar 2026 09:14 #1201
    Brad
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    vhs-decode's RF filters have been significantly improved since last year. I've attached a new decode of the same RF file from my previous post. The measured black SNR is 1dB lower, but I personally don't mind extra noise when the overall image is improved.

    New Avisynth script to aid comparison.
    Code:
    JP     = LWLibavVideoSource("ReBoot Medusa INTERPOL - HV-BS890 =YC= ATI 600 (110-32-64-32-0).mkv").ConvertToYV24().Subtitle("HV-BS890 <YC> ATI 600")
DdD    = LWLibavVideoSource("rebootmedusa_hv-bs890_minicoax_smabnc_gain3_snr40.5.mkv").ConvertToYV24().Crop(1,5,-0,-1).AddBorders(0,0,4,0).LanczosResize(720,480).Levels(6,1.0,245,0,255,coring=false,dither=true).Tweak(sat=1.1,hue=4,coring=false).Subtitle("HV-BS890 <head RF> DdD (vhs-decode 2025)")
DdD039 = LWLibavVideoSource("rebootmedusa_hv-bs890_minicoax_smabnc_gain3_v0.3.9_snr39.5.mkv").ConvertToYV24().Crop(1,5,-0,-1).AddBorders(0,0,4,0).LanczosResize(720,480).Levels(6,1.0,247,0,255,coring=false,dither=true).Tweak(sat=0.8,hue=4,coring=false).Subtitle("HV-BS890 <head RF> DdD (vhs-decode 2026, v0.3.9)")



Interleave(JP,DdD,DdD039,JP)
#StackVertical(StackHorizontal(JP,DdD),StackHorizontal(JP.BlankClip,DdD039))



    Originally Posted by Brad View Post
    These were captured simultaneously.

    The vhs-decode toolchain defaults to 10-bit 760x488. I exported 8-bit 760x486 instead. I could have manually adjusted the levels and hue a bit before exporting, but I decided to share the automatic output.

    Both files are FFV1, to save as much server space and download time as possible. They can be opened with VirtualDub2.

    Originally Posted by dellsam34 View Post
    Mitsubishi HV-BS890 should be good, Can you use it for both methods? I read about 629TBC feature, Anyway, don't you have to compensate for the Japanese IRE levels when playing back US NTSC tapes?
    Here are the available picture settings, BTW.

    画質 = gashitsu = Image Quality
    • modes are:
      • 標準 = hyōjun = Standard
      • ワイド = waido = Wide
      • ダビング = dabingu = Dubbing
      • NR
    色ずれ = Color Shift
    • choices are:
      • 標準 = hyōjun = Standard
      • 1 through 5, both positive and negative
    Settings for this sample:
    • Image Quality: Standard
    • Color Shift: Standard
    • 629TBC: On
    • 3DNR: Off
    Avisynth script to help compare them.
    Code:
    JP  = LWLibavVideoSource("ReBoot Medusa INTERPOL - HV-BS890 =YC= ATI 600 (110-32-64-32-0).mkv").ConvertToYV24()
DdD = LWLibavVideoSource("rebootmedusa_hv-bs890_minicoax_smabnc_gain3_snr40.5.mkv").ConvertToYV24().Crop(1,5,-0,-1).AddBorders(0,0,4,0).LanczosResize(720,480).Levels(6,1.0,245,0,255,coring=false,dither=true).Tweak(sat=1.1,hue=4,coring=false)


Interleave(JP,DdD)
#StackHorizontal(JP,DdD)
    Image Attached Files
    My YouTube channel with little clips: vhs-decode, comparing TBC, etc.
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  2. 31st Jul 2026 16:45 #1202
    kodec
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    Searching for someone whom I can ship for rebuild: a PAL VCR, a PAL BETAMAX and an NTSC BETAMAX.
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  3. 7th Aug 2026 11:59 #1203
    Joscraft_05
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    I'm currently seeing if i can use VHS-Decode with my Terratec Cinergy HT PCI card that’s PCI and have a CX23883-39 chip on it mostly for single channels formats such as Video 8, Hi8 and Laserdisc, for multi channels formats formats such as Betamax, VHS and Super VHS i will still be capturing them the conventional way with a DVD recorder with TBC with a 12-bit ADC on it from a Sony RDR-HX recorder until the MISRC iteration becomes better in the future as an alternative to the CX cards and the clock gen mod.

    Also, how does this works without using that ADA amp in the chain and a Stock unmodified good CX card that could have good Crystal oscillators already? The captures would look worse than a good conventional capture?

    I can’t get the ADA amp and if i do it i will be using my CX card stock unmodified just to see if it worth it and i get sharper and better results with less color bleed than a conventional capture using my Digital 8 camera via FireWire.

    This is my card:
    Image
    [Attachment 93339 - Click to enlarge]

    Edit: Never mind, the ADA Amp in the chain is super important for vhs-decode to make more sense, however seems like the 40MHz crystal mod is not that necessary because with 28.6msps is well enough for analog formats using that ADA amp in the chain.

    Sadly there are not a SINGLE video in youtube doing a well explanation, showing the setup and how it is properly done. I have always wondered what best port is used to connect the BNC cable carrying the audio and video from single channel formats to the CX card, composite to BNC? S-video to BNC?
    Last edited by Joscraft_05; 7th Aug 2026 at 14:55.
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  4. 8th Aug 2026 10:19 #1204
    aramkolt
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    I'm not sure what video explanation is really needed? The RF amp just goes between your RF source and the CX card and requires around 12-16VDC power, though you can make it work on other voltages too. The wiki explains that you do have to choose input and output gain resistors for the ADA amp though, but seems like the input side doesn't matter quite as much with some saying to just use 40K-50K resistors on the input side. Output side there'd be one 560ohm resistor and another that gets your ending voltage up to around 1.5V peak to peak on an oscilloscope, or you could use the capture interface to make sure the gain resistor isn't set too high.

    The more confusing part of using a CX card is it being highly recommended to do a "clockgen" mod to the card which is yet another custom board to acquire that I believe is often out of stock, though you could make some yourself. I've dabbled with the Cx card, but I didn't do the clockgen mod with mine as I don't really plan to do any super long captures with it in the testing stage.

    BNC connectors are generally better for sensitive signals, but keeping the card un-modded and just using the regular composite or S-Video jack is plenty fine for dabbling with, you can always upgrade later.

    If you're looking to just get better results than DV, you could just do a traditional capture from the S-Video output of the D8 camera as well. Getting at the RF tap point on consumer camcorders can be kind of frustrating/tedious if you aren't used to working with tiny wires unless you're using a custom breakout cable.
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