can I use NVdecoder to decode the video with alpha channel and get RGBA images?

Gaming and Visualization Technologies Video Processing & Optical Flow
1

first i have a video with alpha channel, and the video is encoded by vp9, the container format is webm. than I use the ffmpeg to demux the the video. it’s ok! but when I use nvdecoder to decode the packet,I want to get the RGBA image for opengl display. the function Nv12ToBgra32 is not deal with the alpha channel. so how can I do to get RGBA format image or data?

2

Hi.

Video decode with alpha channel is not supported with NVIDIA Video Codec SDK.

Thanks.

3

thank you

4

Hi,
I see the latest NVENC supports to encode alpha channel to HEVC.
However I could not find any information for alpha decoding using NVDEC.
Does the latest NVDEC support to decode HEVC with alpha channel already?
Thank you.

1 Like
5

Theoretically yes, because vp9 uses completly separate bitstream for alpha. Even encoding stettings is separate for alpha. But not supported by nvidia apis.