> On Feb 5, 2025, at 23:33, James Almer <[email protected]> wrote:
>
> On 2/5/2025 12:10 PM, Zhao Zhili wrote:
>> From: Zhao Zhili <[email protected]>
>> Signed-off-by: Zhao Zhili <[email protected]>
>> ---
>> 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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