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VapourSynth ProRes crashing - Printable Version

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VapourSynth ProRes crashing - r3dfx - 14.11.2025

Hi!
For some reason VapourSynth's viewer and subsequent encoding crashes with ProRes source from AJA's ControlRoom (Hybrid 2025.05.18.2)

   

RE: VapourSynth ProRes crashing - Selur - 14.11.2025

AFK atm. did you try another source filter? I.e. BestSource?

RE: VapourSynth ProRes crashing - r3dfx - 14.11.2025

Exclamation
This actually fixes the problem, but I don't quite understand why..

RE: VapourSynth ProRes crashing - Selur - 14.11.2025

BestSource uses a newer libav library as source and that propably fixed some problem related to the format or container.

Cu Selur

RE: VapourSynth ProRes crashing - r3dfx - 14.11.2025

Sorry for being kinda off-topic, but how to properly convert 10bit->8bit footage?10 bits in ProRes are excessive for my use case (VHS) since SNR is pretty low
fmtconv inserted before QTGMC looks like a potential solution

RE: VapourSynth ProRes crashing - Selur - 14.11.2025

Hybrid by default tries to only apply color changes when necessary.
Hybrid offers multiple ways to change the color space:
  • 'Filtering->Vapoursynth->Misc->Source->Convert to target color space after source' will convert to the output color format directly after loading the source.
  • For most filters under "Filtering->Vapoursynth" with "Filtering->Vapoursynth->Misc->UI->Show 'Gimmick'-controls" enabled, you can:
    • Convert to a specific color, or
    • Restrict the bit depth
    [Image: grafik.png]
  • You can always add custom code in a 'Custom'-section before some Filter. (note that the filter does not have to be used, this is about the filter position in the filter order)
    In case of wanting a specific color space, you could even let Hybrid do it by entering:
    # requires colorformat YUV422P8
    Hybrid would then add something like:
    # defining beforeDeCross-function - START
    def beforeDeCross(clip):
      # requires colorformat YUV422P8
      return [clip]
    # defining beforeDeCross-function - END
    ...
    # adjusting color format to YUV422P8 for custom section
    clip = core.resize.Bicubic(clip=clip, format=vs.YUV422P8, range_in_s="limited")
    [clip] = beforeDeCross(clip)
    to the script and thus you could force a specific color space even before the deinterlacing.
    You could also use fmtc in such a 'Custom'-section. If you change the color format make sure to let Hybrid know you did so.
    Quote:Insert before:
    Select the position the custom script addition should be inserted before.


    In custom sections you can use:
    - '# scantype <tff|bff|telecine|progressive>' to let Hybrid know that the scan type changed.
    - '# colorformat <YUV420P8|...YUV444P16|RGB24|..|RGBS>' to let Hybrid know the color format changed.
    -'# width <48-16384>' to let Hybrid know the width changed.
    -'# height <48-16384>' to let Hybrid know the height changed.
    -'# framerate <0.01-1000>' to let Hybrid know the frame rate changed.
    -'# colormatrix <Rec.709|FCC|Rec.601/470bg/470m|..|Chroma cl>' to let Hybrid know the color matrix changed.
    -'# requires mod <1-..>' to let Hybrid know the custom addition requires modX.
    -'# requires colorformat <YUV420P8|...YUV444P16|RGB24|..|RGBS>' to let Hybrid know the custom addition requires a specific color format.
    -'# requires colormatrix <Rec.709|FCC|Rec.601/470bg/470m|..|Chroma cl>' to let Hybrid know the custom addition requires a specific color matrix.

    - '# additional output <variablename> [, colorformat: <Vapoursynth>][, width: <48-16384>][, height: <48-16384>][, fps: <0.01-1000>][, colormatrix: <Rec.709|FCC|Rec.601/470bg/470m|..|Chroma cl>][, yuvluminancescale: <limited|full>][, scanorder: <progressive|tff|bff|telecine>]' add an additional output with characteristics, all not specified characteristics will be copied from the current variable
    Hybrid will also replace:
    - %FILTERPATH% with the current filter base path
    - %SCRIPTPATH% with the current script base path
    (tool-tip of 'Insert before')

Cu Selur

RE: VapourSynth ProRes crashing - r3dfx - 14.11.2025

Thank you so much for the detailed explanation!