> Generally UTF-8 codepage should not be needed, because unicode windows 
functions should be used everywhere, right?

No. FFmpeg does not seem to use WinAPI ANSI functions explicitly, but it still 
uses ordinary stdlib functions (fopen etc.) instead of their wide equivalents. 
See https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293169.html.

> And use simple fftools/fftools.manifest and fftools/manifest.rc as filenames, 
> because 
later other things might be put there, not only utf8/longpath support.

Done in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293204.html.

> I'd perfer if you enable UTF8 codepage in a separate patch.

Done in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293207.html.

Actually, UTF-8 codepage was already absent in the fourth version of this 
patch: https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293168.html. 
Microsoft documentation 
(https://docs.microsoft.com/en-us/windows/win32/sbscs/application-manifests) 
says that manifests can be added to DLLs too, and does not say whether 
longPathAware and activeCodePage apply to the process or to individual DLLs 
loaded into it. Thus I wasn't sure whether ANSI-encoded strings passed to 
external APIs will be decoded correctly. Unfortunately, if it were that 
longPathAware is per DLL, manifests would need to be added to avformat.dll 
etc., so I decided to test how things actually work. It turned out that 
longPathAware and activeCodePage are applied per process, which means that all 
externally loaded libraries will have CP_ACP set to CP_UTF8, which means that 
there should be no problem in using activeCodePage in FFmpeg.

For some reason, fifth version of patches ended up being sent as separate 
messages. Only the second part 
(https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293206.html) is a 
reply to the first 
(https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293205.html). It's a 
strange email glitch. I swear I used git send-email to send these patches.



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