df.palette = false;
println!(" [intermediate format {}]", df);
let res = alloc_video_buffer(NAVideoInfo::new(in_fmt.width, in_fmt.height, false, df), 3);
df.palette = false;
println!(" [intermediate format {}]", df);
let res = alloc_video_buffer(NAVideoInfo::new(in_fmt.width, in_fmt.height, false, df), 3);