On Sat, May 9, 2026 at 3:34 AM Andrew Randrianasulu <randrianasulu@gmail.com> wrote:
https://bitbucket.org/multicoreware/x265_git/downloads/x265_4.2.tar.gz
Patch (git am) attached
put file in thirdparty/src, patch sources, autogen.sh then build as usual
In theory now for h265.mp4 you can select yuva420/yuva420p10, but I am not sure it works as intended ...
decoding says alpha present (if I set loglevel=debug in decode.opts) but other sources including ffprobe from ffmpeg-8.1 detect just yuvj420p ?
More hevc test files at https://lf-tk-sg.ibytedtos.com/obj/tcs-client-sg/resources/video_demo_hevc.h... I loaded one with transparency but it does not work for me? At least in cingg I also created alpha h265 profile setting fourcc to hvc1/0x31637668 for better Apple compatibility https://trac.ffmpeg.org/ticket/7965 I also failed to create standalone fourcc utility converting string to 4byte code, so i just used value reported by ffmpeg/ffprobe
Tested only on Rosa 2016 x86-64 chroot