函数 av_packet_copy_props 

pub unsafe extern "C" fn av_packet_copy_props(
    dst: *mut AVPacket,
    src: *const AVPacket,
) -> c_int

Copy only “properties” fields from src to dst.

Properties for the purpose of this function are all the fields beside those related to the packet data (buf, data, size)

@param dst Destination packet @param src Source packet

@return 0 on success AVERROR on failure.