DVDFab Forum - 2-pass h.265 transcoding with hardware acceleration (nVidia CUDA/NVENC)

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2-pass h.265 transcoding with hardware acceleration (nVidia CUDA/NVENC)

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  • 2-pass h.265 transcoding with hardware acceleration (nVidia CUDA/NVENC)

    I am very happy to see that DVDFab got HW-acceleration feature for 2-pass transcoding! As I tested it I was not sure what I get.

    DVDfab does not show "first pass of two passes / second pass of two passes", I see only a nearly constant CPU and GPU usage (at about halftime there should be some change) and if I abort the transcoding procedure at an early stage I get a playable segment of the video (which should be not possible)... All these suggest that there is no real 2-pass encoding going on.

    I must assume that 2-pass HW-accelerated transcoding is applied as a single-pass with some "lookahead". Could you clarify this for us?

    PS: some h.264 files fail to transcode too, I have to set all decoders to DXVA from CUDA to get it work, and DVDFab shows only a single-pass transcoding. But I guess the files were not correcty in some ways...

  • #2
    CUDA should be supported in 2-pass, please post dvdfab_internal.log file and fabcheck_internal.log file, which could be helpful to check the problem. Thanks.
    DVDFab log default location:
    For Windows: C:\Users\User Name\Documents\DVDFab11\Log
    For Mac: Finder>Documents>DVDFab11>Log

    DVDFab Player 5:
    For Windows: C:\Users\User Name\Documents\DVDFab Player 5\Log
    For Mac: Finder>Documents>DVDFab Player 5>Log

    Guide for adding attachments in a post
    --Please use attachment button to attach your most recent log files.

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    • #3
      hi alonsomosley,

      cuda two pass use NVENC HardWare two pass, will not like soft x264 two pass have two encode flow(pass 1 get some data, pass 2 use pass 1 data),
      It will be run on Nvidia driver and Nvenc chips.
      About error problem, please post log.

      Yours,
      Wilson
      Please post your logs the default location is:
      For DVDFab9_Win7 & Win8 C:\Users\User Name\My Documents\DVDFab9\Log
      For DVDFab10_Win7 & Win8 C:\Users\User Name\My Documents\DVDFab10\Log
      For Mac: /User/User name/Documents/DVDFab10/Log
      Please use attachment button and attach your most recent, Internal log and post right here.
      If it's the burning issue, please also attach burn log.

      Thanks!

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