SUMMARY I have a source in v-log 422 10 bit quality. And it's not possible to render a movie according to YouTube HDR video specifications https://support.google.com/youtube/answer/7126552?hl=en#zippy=%2Chdr-metadata%2Cincorrect-color-space-marking%2Chdr-video-file-encoding I have tried render with f=mp4 vcodec=libx264 pix_fmt=yuv422p10le vb=55000K acodec=aac ab=1500K but render not used yuv422p10le pixel format, please make it possible to render 10 bit HDR videos on ubuntu linux. Thanks. STEPS TO REPRODUCE 1. render with params f=mp4 vcodec=libx264 pix_fmt=yuv422p10le vb=55000K acodec=aac ab=1500K OBSERVED RESULT 420 8 bit quality EXPECTED RESULT 422 10 bit quality SOFTWARE/OS VERSIONS Linux: Ubuntu 20.04 (available in About System) KDE Plasma Version: ? KDE Frameworks Version: ? Qt Version: ?
Thank you for reporting. Kdenlive and the framework MLT doesn't support 10bit video at the moment. I change it to "wishlist".
in fact i can make a 10bit movie with vcodec=dnxhd pix_fmt=yuv422p10le vb=150000K nitris_compat profile=4 strict=2 acodec=pcm_s16le but in this case renderer not respect the bitrate setting and make a video with a bitrate about 700mbit/s, which is more than 1.5Gb per second, what is very huge as i have a source with a bitrate 150mbit/s, and final video is black.
10bit support is expected in future versions of MLT.
Thanks for your report! As this depends on MLT it is an upstream and I am going to close this report here as UPSTREAM. See https://sourceforge.net/p/mlt/mailman/mlt-devel/thread/20210420042900.GA31242%40painter.painter/#msg37265097 for further information on MLTs status of 10bit support.