On Thu, 21 Mar 2019 at 05:25, Александр via ffmpeg-user < [email protected]> wrote:
> Hello, I am trying to do full hardware video transcoding with scaling. > > Here is my console command: > ffmpeg -hwaccel nvdec -hwaccel_output_format cuda -i "input.mp4" -vf > scale_cuda=-2:360 -c:v h264_nvenc -b:v 2000k "output.mp4" > > Input stream info: > Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, > 1920x1080 [SAR 1:1 DAR 16:9], 1711 kb/s, 1 fps, 1 tbr, 16384 tbn, 2 tbc > (default) > Output stream: > Stream #0:0(und): Video: h264 (h264_nvenc) (Main) (avc1 / 0x31637661), > cuda, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 2000 kb/s, 1 fps, 16384 tbn, > 1 tbc (default) > > Unfortunately, the output video is stretched vertically. It seems like > filter crops around 60px from the bottom of original video, then scales > 1860x1080 to 640x360. Curious that the very first frame is scaled > correctly. > Scale_npp function doesn't have this problem, but I would prefer use > scale_cuda. > > Could you help me to make this filter work as expected? > > Hello there, Unfortunately, the scale_cuda parameters are quite limited, as you can confirm: ffmpeg -h filter=scale_cuda Compared to scale_npp: ffmpeg -h filter=scale_npp Is there a specific reason as to why you'd prefer scale_cuda over scale_npp? I wouldn't want to make the assumption that scale_cuda is analogous to the scale filter, wherein you'd be able to use specific flags that the latter supports: ffmpeg -h filter=scale Considering that some of the options mapped to the scale filter are not present in the scale_cuda filter in the documentation: https://ffmpeg.org/ffmpeg-filters.html#scale-1 The scale_cuda filter was contributed by Yogender Gupta <[email protected]> so you may try contacting him for clarification on this. _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
