[Cin] fileexr reading error handling

[Andrew Randrianasulu]

Using https://openexr.com/en/latest/HelloWorld.html as example

so for now I have base

commit d51dc1ff2dbd920c6488af4380b8064c9b6a7b4c (origin/master, origin/HEAD)
Author: Good Guy <good1.2guy at gmail.com>
Date:   Tue Aug 29 20:20:10 2023 -0600

    Credit Andrew - rest of fix for Arch (and termux) which includes
thirdparty/Makefile


plus

commit afa6a601fd3228be18aef413061b3d0165344d7c (HEAD -> master)
Author: Andrew Randrianasulu <randrianasulu at gmail.com>
Date:   Wed Aug 30 07:27:57 2023 +0300

    Fileext reading error handling for bg render

commit cac447973db936f7d5594c83521c34f3e5a9c187
Author: Andrew Randrianasulu <randrianasulu at gmail.com>
Date:   Wed Aug 30 05:27:10 2023 +0300

    Add libjpeg dep to.libtiff in thirdparty/Makefile

commit 8297b38e49da0ce73e119138c158e806eb1fb45d
Author: Andrew Randrianasulu <randrianasulu at gmail.com>
Date:   Wed Aug 30 02:48:47 2023 +0300

    Possible fix for ffmpeg 4.4 in pluginfclient.C

====

so, ffmpeg 5.1 based cin seems to work on Slackware 15.0 i586 (with
some self-build packages).

Tested adding ffmpeg video filter to video track, and of course
background render with  on-the-fly compressor switch.

aggrh, in commit message fileert instead of fileexr. I hope this is
not a big problem



will try  my virtual machines next
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