On Thu, Jan 16, 2020 at 5:28 PM Philippe Noël < [email protected]> wrote:
> Hi, > > I was using libx264 to encode a video file using libav from a C file and > switched to nvenc_h264 and now the encode is very slow. It appears > nvenc_h264 does not have a "ultrafast" setting. > > With nvenc_h264 I am using preset "llhq" and tune "zerolatency". Am I > using the wrong settings? > > Cheers, > > Philippe > _______________________________________________ > Libav-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/libav-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". In my experience, x264 is very fast and you may not be able to beat it at low quality. That said, there are a lot of possibilities for why it may be slow. Look at: https://devblogs.nvidia.com/nvidia-ffmpeg-transcoding-guide/ which will give you some tips for minimizing PCIe transfers to keep it fast. Cheers.
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