mjpg-streamer/plugins/output_zmqserver/package.proto

syntax = "proto2";
package pb;

message Package {
    message Frame {
        required uint32       timestamp_unix = 1;
        required uint32       timestamp_s   = 2;
        required uint32       timestamp_us  = 3;
        required bytes        blob          = 4;
    }

    repeated Frame frame = 1;
}