[FFmpeg-devel] [PATCH] NVENC Surface Allocation Reduction
timo at rothenpieler.org
Thu Apr 27 02:12:55 EEST 2017
> This seems to be a regression introduced when filtergraph initialization related changes were passed. The below commit and its follow up seems to have caused the issue. I am looking to fix this. Please let us know if you have any suggestions in mind. Thanks
Yes, this initially started happening with that.
What it does for nvenc/cuvid is basically that it swapped around their
order of initialization. Now cuvid is initialized first, and nvenc is
not fired up until cuvid returns the first frame.
Before, nvenc was initialized first.
Initially, this completely broke cuvid->nvenc, but that was fixed with:
Kinda making me wonder why/how it ever worked in the first place.
Now only that weird max_b_frames > 0 behavior is left, but only when
doing direct hwaccel transcoding from cuvid to nvenc.
Dropping -hwaccel cuvid, so sending frames back and forth through system
memory, fixes it.
Using -vf hwupload_cuda works just fine with bframes as well, so it
can't really be an issue with the PIXFMT_CUDA frame handling code in
nvenc, as that would blow up then as well.
More information about the ffmpeg-devel