On 2/5/2025 2:22 PM, Zhao Zhili wrote:
On Feb 5, 2025, at 23:33, James Almer <jamr...@gmail.com> wrote: On 2/5/2025 12:10 PM, Zhao Zhili wrote:From: Zhao Zhili <zhiliz...@tencent.com> Signed-off-by: Zhao Zhili <zhiliz...@tencent.com> --- libavcodec/hevc/hevcdec.c | 72 ++++++++++++++++++++++++++++++++++++++- libavcodec/hevc/hevcdec.h | 2 ++ libavcodec/hevc/refs.c | 11 +++++- 3 files changed, 83 insertions(+), 2 deletions(-)I tried with https://0x0.st/X7Vx.mov and https://0x0.st/8KCA.mp4, and neither seem to output the alpha plane.The first sample is a early release from apple, with error in vps extension. I don’t know where the second sample comes from, it’s blank when playback with QuickTime Player. The bitstream has a lot of error. Here is a sample encoded with videotoolbox ./ffmpeg -i bunny.mp4 -i basketball.mp4 \ -filter_complex '[1:v][0:v]alphamerge,format=bgra[vout]’ -\ c:v hevc_videotoolbox -pix_fmt bgra -alpha_quality 0.5 \ -t 10 -map '[vout]' -tag:v hvc1 alpha.mp4 https://drive.google.com/file/d/1SK6gnMNlWODeTySpetNAKgNeqt69DQDz/view?usp=drive_link
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