[Cin] Crash when using OpenEXR image sequence

[Andrea paz]

The TOC file is imported without errors but is misidentified and does
not carry over the images.
On terminal:

    FFStream::decode: avcodec_send_packet failed.
file:/home/paz/test-exr/test-exr.exrs
  err: Not yet implemented in FFmpeg, patches welcome
[...]

Now I understood my mistake: creating an EXR sequence is done not with
ffmpeg engine, so also the import must be done not in ffmpeg. With the
option "Try FFmpeg last" everything works fine. The same with the PNG
sequence. See image.
Thanks, Andrew!
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