On Saturday 2017-06-03 13:34, Hendrik Leppkes wrote: >On Sat, Jun 3, 2017 at 1:18 PM, Jan Engelhardt <jeng...@inai.de> wrote: >> >>The layout of struct AVCodec changed. Four function pointers were >>inserted in the middle, shifting void (*flush) to a new address. >>The size of AVCodec also changed, which would have required a full >>MAJOR bump. > >Our ABI is stable in one direction, not in both. [...] >The same applies to structs. The size of structs is not part of the >ABI, and as such we are free to grow it to accomodate new fields >without breaking the ABI.
Size changes are breakers in both directions. You claim your ABI is stable in one direction, which means that a program built with 3.0 headers should work with a 3.3 library on a separate system. However, a 3.0 program which invokes someAVcontext->flush(...) would, under 3.3, invoke someAVc->send_frame because of the changed layout. So it's not ABI compatible in that one direction that ffmpeg is supposed to be compile, either. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel