Merge commit 'ee9e966296d74ca3836be5b5adc839cfc73d8c98' into release/2.2
* commit 'ee9e966296d74ca3836be5b5adc839cfc73d8c98': Update Changelog for v10.4 Prepare for 10.4 Release Conflicts: Changelog RELEASE Not merged as these dont apply to FFmpeg Merged-by: Michael Niedermayer <michaelni@gmx.at>
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