On 11/26/18, msanders <[email protected]> wrote: > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > On Monday, 26 de November de 2018 14:00, Micael Silva > <[email protected]> wrote: > >> On Mon, Nov 26, 2018 at 7:47 AM msanders [email protected] wrote: >> >> > Hi, >> > As now we have many filters compatible with the GPU, and in particular >> > “scale” filters. So I think we need a filter like “hwoverlay” or >> > “overlay_cuda/_qsv/etc.”. >> > With this kind of filter we can do a PiP using only a GPU pipeline: >> > >> > - GPU decoder --> spplit (hw) --> hwscale --> hwoverlay --> GPU >> > encoder >> > >> > In fact, I feel it’s not too complex to do. >> > What you think? >> > M. Sanders >> >> It's a good idea, although working with hardware accelerators it's never >> so >> straightforward. It depends how that API is construct, what methods are >> allowed, and many bugs and crashes surface. Hardware processing is less >> flexible in many aspects. >> >> Maybe possible, but I think that requiring more specialized people may >> take >> more time to realize >> > Hi, > > The complexity varies. > - If the implementation is "generic", for example using some function like > "av_frame_clone()" that works with RAM and GPU frames, then it will be more > complex... at start. In this case new functions "av_frame_clip()" and > "av_frame_overlay()" should be required. > - And if the implementation is "particular", for example implementing > "overlay_cuda|_qsv", then it will be more simple. > > In fact, using the code of "vf_scale_cuda.c" can be easy to translate it to > a "vf_overlay_cuda.c". The reason it's because the GPU copy functions are > already implemented. And the algorithm is summarized in: copy the complete > frame and then overwrite with the small frame. So, only "copy GPU" functions > are required. > > Anyone interested?
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