AVHWFramesContext has aligned width and height.
When initializing a new AVFrame, it receives these aligned values (in
av_hwframe_get_buffer), which leads to incorrect scaling.
The resulting frames are cropped either horizontally or vertically.
As a fix we can overwrite the dimensions to original values right after
av_hwframe_get_buffer.
More info, samples and reproduction steps are here
https://github.com/Svechnikov/ffmpeg-scale-cuda-problem
---
libavfilter/vf_scale_cuda.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavfilter/vf_scale_cuda.c b/libavfilter/vf_scale_cuda.c
index c97a802..ef1bd82 100644
--- a/libavfilter/vf_scale_cuda.c
+++ b/libavfilter/vf_scale_cuda.c
@@ -463,6 +463,9 @@ static int cudascale_scale(AVFilterContext *ctx, AVFrame
*out, AVFrame *in)
if (ret < 0)
return ret;
+ s->tmp_frame->width = s->planes_out[0].width;
+ s->tmp_frame->height = s->planes_out[0].height;
+
av_frame_move_ref(out, s->frame);
av_frame_move_ref(s->frame, s->tmp_frame);
--
2.7.4
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