fails to build against ffmpeg 4.4

[michojel]

ffmpeg 4.4 made some fields private

MEGAsync tries to access them and fails to build:

mega/src/gfx/qt.cpp:1218:18: error: 'AVStream' {aka 'struct AVStream'} has no member named 'skip_to_keyframe'
 1218 |     videoStream->skip_to_keyframe = true;
      |                  ^~~~~~~~~~~~~~~~

[alkaris2]

Remove dependency ffmpeg3.4 and use ffmpeg 2:4.4-3 as using ffmpeg3.4 breaks dependencies as it relies on another package that is for older systems which causes issues when building on Arch.

https://aur.archlinux.org/packages/megasync

[mtorromeo]

The line can be removed and the compilation succeeds.

The previous line formatContext->seek2any = false is already telling ffmpeg to only seek to keyframes, skip_to_keyframe shouldn't be necessary.

[michojel]

FWIW, on nixos we started building with this patch: https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/misc/megasync/ffmpeg_44.patch
Thanks to @mtorromeo for the hint.