On Thu, Feb 27, 2025 at 11:49 PM Vladimir Mishonov via ffmpeg-user < ffmpeg-user@ffmpeg.org> wrote:
> On 2025-02-28 02:36, Greg Oliver wrote: > > > On Thu, Feb 27, 2025 at 11:25 AM Vladimir Mishonov via ffmpeg-user < > > ffmpeg-user@ffmpeg.org> wrote: > > > > > > https://ffmpeg.org/pipermail/ffmpeg-user/2024-August/058638.html > > > > Thanks for the link. Unfortunately, that seems to be only tangentially > related to my scenario because: > > 1) The resolutions of each input stream do not change over time. > > 2) I can use software decoding and I do not need to insert any scale > filters before sending the streams to hardware: > > ffmpeg -init_hw_device vaapi=hw -filter_hw_device hw \ > -i rtmp://localhost/stream1 \ > -i rtmp://localhost/stream2 \ > -filter_complex > "[0:v]format=nv12,hwupload=extra_hw_frames=120[i0];[1:v]format=nv12,hwupload=extra_hw_frames=120[i1];[i0][i1]overlay_vaapi=w=500" > > \ > -c:v h264_vaapi -global_quality 25 -g 50 -r 25 -an -f null - > > The above command works regardless of whether the input resolutions are > the same, or different. The CPU usage is quite low, but still > noticeable. Note that even if some kind of filter does get automatically > inserted, it does not interfere with the videos themselves in any way - > otherwise, I would have noticed it long ago either because of excessive > CPU usage, or the resolution and/or the content of the output stream > being different from what is expected, or both. > > It would also be, in principle, fundamentally wrong to apply any kind of > software processing in a (theoretically) purely hardware filter pipeline > - not to mention pointless due to the overlay filter in the end, which > performs its own scaling anyway. > > P.S. sorry for top-posting the previous response, I forget it's not > customary because I very rarely use mailing lists, only when there is no > other option. > Sorry - that link I referenced actually did not have the whole thread. The piece I intended to be included was: https://lists.ffmpeg.org/pipermail/ffmpeg-user/2024-September/058652.html If that does not solve it - sorry - I do not use QSV (except in Plex) for anything - I just remembered seeing that email thread a while back, so looked it up. This one has a resolution, but I am unsure if it is software or hardware. > --- > Kind regards, > Vladimir > > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
