[FFmpeg-devel] Major bump

Anton Khirnov anton at khirnov.net
Mon Apr 5 22:20:56 EEST 2021

Quoting James Almer (2021-04-05 13:57:12)
> On 4/5/2021 8:09 AM, Anton Khirnov wrote:
> > Hi,
> > this patchset bumps major version of all the libraries and removes many
> > deprecated APIs, as discussed at length during past months. Patches
> > 11-16 will be squashed together on push, but are sent separately for
> > ease of review. FATE passes (here at least).
> > 
> > As agreed during the last developer call, I am disabling the
> > uspp/mcdeint filters that depend on removed libavcodec APIs. They should
> > be easy to re-enable if anyone finds the motivation to update them.
> > 
> > I am postponing the removal of compute_muxer_pkt_fields() in lavf, along
> > with usage of AVCodecContext.time_base for decoding, since removing them
> > without breakage requires a fair bit of additional infrastructure that
> > is not yet there. I have plans for all these and hopefully I'll get to
> > it before the next bump.
> > 
> > Carl asked during the last meeting for some reasoning for the bump. The
> > general reasons are that
> > - old APIs are unable to provide all the features of the new ones
> >    (that's usually why new APIs are added)
> > - old APIs tend to be harder to use correctly, they often have obscure
> >    quirks or corner cases
> > - maintaining compatibility wrappers for them is a major obstacle to
> >    further development
> > I'm appending some notes for the specific changes further down, they
> > could be added to the wiki or the website news entry.
> > 
> > Please comment,
> The deprecated APIs should be removed one by one before the commit that 
> bumps the versions, so any potential issues or regressions can be 
> bisected to the culprit instead of the "Bump and disable everything" 
> commit. The latter was done last bump and it was a bit hectic.

I like that option less because it means there are commits in master
that break ABI but don't change soname. And I never really saw
bump-related bisecting problems, it's usually clear what the culprit is.
But if others prefer to first remove and then bump then I won't fight
for it very hard.

Anton Khirnov

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