#22 can not playback .avs file which has multibyte-filename

[Fripper]

Hi

mplayerwin(32bit) can not playback .avs file which has multibyte-filename
since build r35966.

I could playback with build r35952, but I could not playback with
build r35966 and newer builds.

I saved log file with redirect on console(cmd.exe), -> attachments

It seems degraded at handling routine of passing it as a parameter
for Avisynth plus library.

• Environment
  OS/Software | version/build | comment
  ---------- | ---------- | ------
  Windows 10 Insider Preview | 17083.1000(rs_prerelease) | 64bit/Home
  mplayer | r35952 / r35966 / r38008 | 32bit
  AviSynth+ | r2580-MT | https://github.com/pinterf/AviSynthPlus/releases

• Avisynth script (same contents, but different filename.)

• single-byte filename -> test.avs
• multi-byte filename -> testあ.avs

SetMemoryMax(5120)
SetFilterMTMode("DEFAULT_MT_MODE", 2)
SetFilterMTMode("DirectShowSource", 3)
SetFilterMTMode("FFVideoSource", 3)
DirectShowSource("test.mp4", fps=23.976, convertfps=true).AssumeFPS(24000,1001)
#
Prefetch(6)

• Playback results. (see attachments)
  single-byte filename .avs | r35952 | OK | 35952-single.log
  single-byte filename .avs | r35966 | OK | 35966-single.log
  single-byte filename .avs | r38008 | OK | 38008-single.log
  multi-byte filename .avs | r35952 | OK | 35952-multi.log
  multi-byte filename .avs | r35966 | NG | 35966-multi.log
  multi-byte filename .avs | r38008 | NG | 38008-multi.log

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