[mythtv] Resync to ffmpeg 4.0

[OpenMedia Support]

Will we be able to enable some new features like NVDEC via this sync?

It would be great to see some better deinterlace support for VAAPI as well

> 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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