Re: [FFmpeg-devel] [PATCH 00/26] Major library version bump

[Marton Balint <cus@passwd.hu>]

On Sat, 21 Jan 2023, Michael Niedermayer wrote:

> On Sat, Jan 21, 2023 at 05:51:34PM +0100, Anton Khirnov wrote:
>> Quoting Michael Niedermayer (2023-01-20 03:05:09)
>>> PS: iam not sure i fully understood the reason behind why versions should be
>>> set to "wrong" values during some period, so as always i might be missing
>>> something
>>
>> The reason is that after the major bump, the API and ABI are declared to
>> be unstable for some period, so people can freely
>> - break ABI, e.g. by reordering struct members
>> - modify API added during the instability period in an arbitrary way
>> without a new major bump for every such change, that would be normally
>> required.
>>
>> My concern is that the instability period is quite long and there is
>> very little indication for our users that they cannot depend on the
>> ABI/API being stable. So I'm proposing to introduce some mechanism to
>> make this more visible for our callers.
>>
>> Alternatively, we could just not have an instability period at all.
>
> Does anyone plan to use the next bumps instability period for anything ?
> If so, i assume theres a good reason why it cannot be done without such
> period easily?

AVCodecContext->frame_number should be changed to int64_t. I guess you 
could do something similar which was done for buffer_size_t, but that 
seems like a lot of extra work and ifdefry for questionable benefit.

Regards,
Marton

>
> If theres noone -> easy solution, we need no instability period ATM.
> If theres someone, i would ask that someone how long it needs to be
> and write that down in APIchanges. Maybe as in "API is unstable becuase
> of X until 2033-11-11
>
> a new #define LIBAVCODEC_UNSTABLE could be added but izt feels a bit
> overengeneered. This whole thing is more a exception, isnt it?
>
> thx
>
> [...]
> -- 
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> While the State exists there can be no freedom; when there is freedom there
> will be no State. -- Vladimir Lenin
>
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