Re: [FFmpeg-devel] videotoolbox increases min target to macOS 12

[epirat07@gmail.com]

On 9 Jul 2024, at 8:16, Gnattu OC via ffmpeg-devel wrote:

>> On Jul 9, 2024, at 13:47, Helmut K. C. Tessarek <tessarek@evermeet.cx> wrote:
>>
>> I'm very sorry to bother the dev list with this, but this is the 2nd time in less than a year that the min version of macOS was changed in videotoolbox.
>>
>> 2023-09-22: macOS 10.13
>> now: macOS 12
>>
>> Will ffmpeg soon only compile on the current release of macOS (with videtoolbox support)? While I understand that too old OS versions are not necessarily the best idea, a lot of people still use older versions. Especially when it comes to Intel based static binaries.
>>
>> I just want to ask what the devs think of this situation.
>> I'm not saying that this has to be fixed. (I just removed the videotoolbox support from my binaries.)
>>
>> I'd asked in a forum, but there is none, nor is there another way to ask the devs a question. And it is a question to the devs:
>>
>> Is it feasible that this code raises the minimum depolyment target that often, while the rest of ffmpeg just works perfectly fine with lower deployment targets?
>
> Well the code introduced is to fix certain HDR related bugs and it does not "works perfectly” before, it was just broken.
>>
>> Cheers,
>>  K. C.
>>
>> Here  is the error message when compiling ffmpeg for reference:
>>
>> libavutil/hwcontext_videotoolbox.c:592:39: error: 'CVBufferCopyAttachments' is only available on macOS 12.0 or newer [-Werror,-Wunguarded-availability-new]
>>        CFDictionaryRef attachments = CVBufferCopyAttachments(pixbuf, kCVAttachmentMode_ShouldPropagate);
>
> This should be fixed by this patch: https://patchwork.ffmpeg.org/project/ffmpeg/patch/tencent_386EBEE5491311084F93F9136A75C4090E05@qq.com/
>
> so that it should at least compile on older OS targets.
> But the end result is that the colorspace is as wrong as before, an older version cannot receive the fix to set the correct colorspace.
>
> For this use case I could see that using the (now deprecated) `CVBufferGetAttachments` instead on older OS, but I cannot really test that because I don’t have device running that old version.

Yes,
I can submit a fix for this soon that makes this work on macOS 10.8+

For now the other patch should be merged to fix the runtime issue. (I am not sure why I did not get any warning about this locally…)

>>                                      ^~~~~~~~~~~~~~~~~~~~~~~
>> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreVideo.framework/Headers/CVBuffer.h:160:59: note: 'CVBufferCopyAttachments' has been marked as being introduced in macOS 12.0 here, but the deployment target is macOS 10.13.0
>> CV_EXPORT CFDictionaryRef CF_RETURNS_RETAINED CV_NULLABLE CVBufferCopyAttachments( CVBufferRef CV_NONNULL buffer, CVAttachmentMode attachmentMode ) API_AVAILABLE(macos(12.0), ios(15.0), tvos(15.0), watchos(8.0));
>>                                                          ^
>> libavutil/hwcontext_videotoolbox.c:592:39: note: enclose 'CVBufferCopyAttachments' in a __builtin_available check to silence this warning
>>        CFDictionaryRef attachments = CVBufferCopyAttachments(pixbuf, kCVAttachmentMode_ShouldPropagate);
>>                                      ^~~~~~~~~~~~~~~~~~~~~~~
>> 1 error generated.
>>
>>
>> -- 
>> regards Helmut K. C. Tessarek              KeyID 0x172380A011EF4944
>> Key fingerprint = 8A55 70C1 BD85 D34E ADBC 386C 1723 80A0 11EF 4944
>>
>> /*
>>   Thou shalt not follow the NULL pointer for chaos and madness
>>   await thee at its end.
>> */
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