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Tue, 8 Feb 2022 21:34:42 +0000 Received: from DM8P223MB0365.NAMP223.PROD.OUTLOOK.COM ([fe80::496c:9ebb:f23e:8e6b]) by DM8P223MB0365.NAMP223.PROD.OUTLOOK.COM ([fe80::496c:9ebb:f23e:8e6b%5]) with mapi id 15.20.4951.019; Tue, 8 Feb 2022 21:34:42 +0000 From: Soft Works To: FFmpeg development discussions and patches Thread-Topic: [FFmpeg-devel] [PATCH 1/4] lavc/mpeg*: drop the XvMC hwaccel code Thread-Index: AQHYF1L5M7hOYkvBtEazNqDB6aJZfqyHWk0AgAACCYCAAhPsfIAAxFQQ Date: Tue, 8 Feb 2022 21:34:42 +0000 Message-ID: References: <20220201100227.18928-1-anton@khirnov.net> =?utf-8?q?=3CAM7PR03M?= =?utf-8?q?B6660368FF770BF9CFF25DFB38F2C9=40AM7PR03MB6660=2Eeurprd03=2Eprod?= =?utf-8?q?=2Eoutlook=2Ecom=3E?= =?utf-8?q?=3CDM8P223MB0365?= =?utf-8?q?2A19235F0878A58FEC2DBA2C9=40DM8P223MB0365=2ENAMP223=2EPROD=2EOUTL?= =?utf-8?q?OOK=2ECOM=3E?= <164431301321.19727.453011583235613178@lain.red.khirnov.net> In-Reply-To: <164431301321.19727.453011583235613178@lain.red.khirnov.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-tmn: [wJLVtMwL1CmrSQ48IxK9PH+YVX1LwgNU] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b3798e0e-4b11-4364-0ff9-08d9eb4ad1ad x-ms-traffictypediagnostic: CH0P223MB0004:EE_ x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: > -----Original Message----- > From: ffmpeg-devel On Behalf Of > Anton Khirnov > Sent: Tuesday, February 8, 2022 10:37 AM > To: FFmpeg development discussions and patches devel@ffmpeg.org> > Subject: Re: [FFmpeg-devel] [PATCH 1/4] lavc/mpeg*: drop the XvMC > hwaccel code > > Quoting Soft Works (2022-02-07 03:18:54) > > I sometimes wonder whether there exists a single API user who > > really understands this (very special) kind of logic and > > would make decisions based on that understanding. > > > > When it's not even fully understood internally, how should it > > be understood externally? > > The rule for API users is simple: you are not allowed to assume a > specific component (like a decoder, demuxer or hwaccel) will be > available at runtime*. You are supposed to check for it using the APIs > provided for this purpose. In this case, AV_PIX_FMT_XVMC will just > stop > being offered in get_format(). > > Not to mention that I very much doubt there are any users of xvmc > left, > besides the original mplayer. > > * unless you are running with a very specific verified build, in which > case a removal like this should be caught at the build stage Thanks for the explanation. I misunderstood this a bit - when the only effect of the "removal" is an output like when the libs wouldn't have been compiled with that part, then that's maybe nothing to be blamed for. On the other side: when somebody is using it and updates the libs to a point where it's missing, it will be broken for her/him. So the outcome might not be _that_ different for any other breaking changes being made. And that's what I meant to point out: On one side, we are carefully curating those versioning changes (individually for each lib!) with a complex set of rules and considerations to be made, while in the majority of cases I tend to believe that not many really care that much about it, instead sitting there, happily using it until the moment "Oh it's broken - - need to do something - fix it and go on.." :-) softworkz _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".