[mythtv] FFmpeg 4.4.1 problems

[Scott Theisen]

On 11/24/21 8:39 PM, Peter Bennett wrote:
>
> Thank you. Great work. I plan to combine the list of commits that 
> Scott Theisen created, plus the pull request that he created for 
> eliminating unnecessary code that is no longer used, plus this, and 
> use a new methodology as suggested by Piotr, to take the FFmpeg code 
> and apply our patches on it, rather than merging the FFmpeg version 
> with our code.
>
I rebased https://github.com/ulmus-scott/FFmpeg/commits/rebase/4.4m2 to 
remove the various reversion commits I added.  See 
https://github.com/ulmus-scott/FFmpeg/commits/rebase/4.4m3 , not (yet) 
tested to compile at each commit.

My pull request, https://github.com/MythTV/mythtv/pull/416 , mostly does 
not touch the FFmpeg copy in the mythtv repository.
>
> The list of our patches can be stored somewhere and updated as 
> necessary so that it can be applied to each new FFmpeg version. 
> Alternatively, once the patches have been applied to a version, they 
> can be extracted again using git format-patch and applied to the next 
> version with git am. This could also pick up any new patches that were 
> subsequently applied to our FFmpeg code, although hopefully these 
> could be kept to a minimum.
>
> Peter
>
It should be easier to rebase from one release branch to another, since 
I have split the changes and eliminated others.

The subtitle changes need to be investigated to determine if they are 
still necessary.  What the mpegts changes *are* also needs to be 
determined.  Additionally, the use of internal ffmpeg headers in MythTV 
needs to be replaced.

Peter: you deleted README.sync.  Was that intentional?  If so, you can 
probably drop the commits editing it.


Scott
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