On Mon, Jan 14, 2019 at 09:21:10AM -0500, Devin Heitmueller wrote: > On Mon, Jan 14, 2019 at 3:31 AM Michael Niedermayer > <mich...@niedermayer.cc> wrote: > > Thus a new function should be added which does all this, and that then > > be used > > For what it's worth, the fix is actually incorrect both here and in > vf_vps. When doubling the framerate, the correct behavior is to split > the content across both frames and cut the cc_count in half (it's > actually more tricky than that because certain entries have to be > moved to the front of the array).
thanks for explaining, i had already suspected that this would become more complex ... > > That said, using a centralized function is a step in the right > direction. It should probably be in libavutil, given it will need to > be available to both filters and formats (and potentially codecs as > well if we wanted them to proactively fix cases where they receive an > invalid cc_count). That said, in order to do the transformation > properly it would need to receive the target framerate as well as be > able to maintain some state (since reducing the framerate requires > content to be cached in order to combine one or more entries). > > In short, a centralized function would be good, but we probably need > to think through what the API looks like so we don't have to introduce > a new API in libavutil and then deprecate it once we want to make the > splitting/combining logic work according to the spec. I fear that no matter how hard we try we will likely eventually run into cases that it cannot handle also maybe 2 functions would keep this simpler one to deal with temporal transformations (frame drop, duplicate, interpolate, combine) one to deal with spatial transformations, crop, pad, scale, rotate [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB No snowflake in an avalanche ever feels responsible. -- Voltaire
signature.asc
Description: PGP signature
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel