[packman] Questions/suggestions concerning current builds of FFmpeg for openSUSE Leap 15.3

MoC moc at coders-haven.net
Tue Aug 17 19:35:24 CEST 2021

Dear PackMan maintainers,

I am using FFmpeg 4.4 provided by the PackMan repositories for all my 
multimedia conversion (and playback) needs. I have made the following 
observations and would like some feedback from you:
1) You are currently building libswresample without libsoxr. As the SoX SRC is 
better at preventing aliasing (at the cost of some ringing when using a small 
transition band, cf. https://src.infinitewave.ca/), would you mind enabling 
it? (Perhaps Gyan's configuration for his Windows builds at https://
www.gyan.dev/ffmpeg/builds/ can be used as an up to date guide for which 
features should be enabled by default?)
2) The avresample feature has been deprecated (cf. https://bugs.gentoo.org/
show_bug.cgi?id=722274) and you might want to remove it. Apparently it has 
already been removed in git master so it will most likely be gone anyway when 
version 4.5 is released.
3) You seem to have patched FFmpeg to allow for a dynamic linking against 
FDK's AAC library, most likely since you cannot redistribute this library with 
the FFmpeg package. Would it make sense to add libfdk-aac2 to the 
"Recommends:" list of the corresponding package? This way one would not 
encounter an error message when attempting to use this codec the first time 
and you would (at least in my opinion) still keep the packages separate.

I am looking forward to your reply and thanks for putting in all this effort 
so far.

Kind regards,

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