[mythtv] Resync to ffmpeg 4.0

[Jean-Yves Avenard]

great on how quick it was resyncing… that would have taken weeks typically in the past

> On 24 May 2018, at 11:14 pm, Peter Bennett <pb.mythtv at gmail.com> wrote:
> 
> I have re-synced the MythTV master source and put the results in branch devel/ffmpeg-resync to ffmpeg 4.0. I am now using the forked FFmpeg repository MythTV/FFmpeg to track our customization. Future merges should be easier, by creating the branch on MythTV/FFmpeg and doing a git merge from FFmpeg/FFmpeg. There could still be conflicts and errors needing fixing but I think the process will be an improvement.
> 
> Let me know if there are any problems with the devel/ffmpeg-resync branch.
> 
> Note the first commit caused a compile failure because I did not fix the plugins (I tend to forget those). That is why there are dozens of buildslave failures.
> 
> Peter
> 
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