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  1. hello,

    when I encode 720p HD sources with 29,97 to BD compilant 720p sources I usually use changefps(59.94) in Avisynth and make a 720p59.94 x264 encode.

    This time time I have a 25fps 720p HD source so I want to go for the 720p50 specification but somehow changefps(50.00) doesn't work. I get an error and don't understand why this is a wrong divisor?
    There is also the possibility to not use the avisynth fps command and just go for a
    720p25, which (according to http://www.x264bluray.com/home/720p-encoding) doubles the framerate with the "--pulldown double preset".
    The encode works fine but plays with 50% more speed which is totally senseless.

    Any advice is appreciated
    thanks
    regards
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  2. Always post your complete AviSynth script, x264 command, logs and error messages.

    Note that pulldown may not work correctly with all muxers/authoring softwares (tsMuxer may have problems)

    http://www.x264bluray.com/issues-with-certain-players
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  3. Member
    Join Date
    Aug 2013
    Location
    Central Germany
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    In general you should prefer either a framerate preset string ("pal_double") or a pair of numerator and denominator (50, 1) over a floating point number.

    And to exactly duplicate frames, there may be more reliable functions than ChangeFPS. I would guess: Interleave(last, last).AssumeFPS(50, 1)
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  4. My avisynth script was

    AVCSource("..........dga")
    changefps(50.00)
    my x264 command line in simple x264 launcher:
    --bluray-compat --level 4.1 --keyint 50 --sar 1:1 --slices 4 --vbv-bufsize 30000 --vbv-maxrate 40000 --b-pyramid none --weightp 0 --colorprim bt709 --transfer bt709 --colormatrix bt709 --merange 24
    the error line in the x264 log was "error: Evaluate: System exception - Integer Divide by Zero"

    using changefps(pal_double)
    causes the error: don't know what pal_double means
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  5. Member
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    You forgot the double quotes for string literals. See: http://avisynth.nl/index.php/FPS

    Code:
    changefps("pal_double")
    Furthermore, DGAVCDec is outdated. Recommendable alternatives today are FFMS2 or L-SMASH Works. But as long as it can handle your sources, well ...
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  6. x264 offer possibility to use pulldown 2:2 - no penalty on bitrate.
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  7. Originally Posted by LigH.de View Post
    You forgot the double quotes for string literals. See: http://avisynth.nl/index.php/FPS

    Code:
    changefps("pal_double")
    .
    doesn't work either. "System exception - Integer Divide by Zero" with changefps("pal_double") as well

    Originally Posted by LigH.de View Post

    Furthermore, DGAVCDec is outdated. Recommendable alternatives today are FFMS2 or L-SMASH Works. But as long as it can handle your sources, well ...
    Ok I can check those out but I didn't get any error messages with DGAVCDec. The indexing was fine as usual so I doubt this is the problem here
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  8. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Does the script open successfully in Virtualdub2 ?
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