decode mjpeg failed

[Lizi633]

我尝试用mpi_dec_test -i /home/cat/Desktop/output_mjpg.avi -t 8 -n 30 解码一段用mjpeg编码的视频。但是在log里出现了错误。 Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: input file /home/cat/Desktop/output_mjpg.avi size 1626964 Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: cmd parse result: Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: input file name: /home/cat/Desktop/output_mjpg.avi Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: output file name: Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: width : 0 Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: height : 0 Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: type : 8 Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_utils: max frames : 30 Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_test: mpi_dec_test start Jun 17 20:56:29 lubancat mpp[352773]: mpp_buffer: mpp_buffer_get invalid input: group 0x559fad6588 buffer 0x7fc116e020 size 0 from dec_decode Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_test: failed to get buffer for input frame ret -2 Jun 17 20:56:29 lubancat mpp[352773]: mpi_dec_test: test failed ret -2 这是什么原因呢？ mpi_dec_test -i /home/cat/Desktop/output_mjpg.avi -t 8 -n 30 -w 2560 -h 720 我添加了图像的size之后可以跑完。但是log输出的还是不正常 Jun 17 21:14:29 lubancat mpp[410828]: mpp_dec: mpp_dec_advanced_thread something wrong with mpp_parser_parse! Jun 17 21:14:29 lubancat mpp[410828]: mpi_dec_test: 0x55936cd5c0 decoded frame 0 Jun 17 21:14:29 lubancat mpp[410828]: mpp_dec: mpp_dec_advanced_thread something wrong with mpp_parser_parse! Jun 17 21:14:29 lubancat mpp[410828]: mpi_dec_test: 0x55936cd5c0 decoded frame 1 Jun 17 21:14:29 lubancat mpp[410828]: mpp_dec: mpp_dec_advanced_thread something wrong with mpp_parser_parse! Jun 17 21:14:29 lubancat mpp[410828]: mpi_dec_test: 0x55936cd5c0 decoded frame 2 Jun 17 21:14:29 lubancat mpp[410828]: mpp_dec: mpp_dec_advanced_thread something wrong with mpp_parser_parse! 这是添加了w和h参数之后的log输出

[HermanChen]

mpp 只能解码祼码流，不能解码带封装的数据

[Lizi633]

明白了，我还有一个问题，就是我用 test里的dec_advanced 部分代码来实现我的mjpeg解码，为什么卡在了 ret = mpi->poll(ctx, MPP_PORT_OUTPUT, MPP_POLL_BLOCK); 这里。就不往下执行了。 在log里报错 Jun 18 11:04:41 lubancat kernel: [47365.407214] uvcvideo: Non-zero status (-71) in video completion handler.

        void *bufferPtr = buffers[buf.index]->ptr;
        MppPacket packet = NULL;
        MppFrame mpp_frame = NULL;
        MppTask task = NULL;
        MPP_RET ret = mpp_packet_init(&packet, bufferPtr, buf.bytesused);
        if (ret != MPP_OK)
        {
            std::cerr << "Failed to init packet: " << ret << std::endl;
            return false;
        }

        // Enqueue packet to decoder
        ret = mpi->poll(ctx, MPP_PORT_INPUT, MPP_POLL_BLOCK);
        std::cerr << "packet " << packet << std::endl;

        if (ret)
        {
            std::cerr << "Input poll failed: " << ret << std::endl;
            mpp_packet_deinit(&packet);
            return false;
        }

        ret = mpi->dequeue(ctx, MPP_PORT_INPUT, &task);
        if (ret)
        {
            std::cerr << "Task input dequeue failed: " << ret << std::endl;
            mpp_packet_deinit(&packet);
            return false;
        }

        mpp_task_meta_set_packet(task, KEY_INPUT_PACKET, packet);

        // Setup output frame
        ret = mpi->enqueue(ctx, MPP_PORT_INPUT, task);
        if (ret)
        {
            std::cerr << "Task input enqueue failed: " << ret << std::endl;
            mpp_packet_deinit(&packet);
            return false;
        }

        // Wait for decoded frame
        ret = mpi->poll(ctx, MPP_PORT_OUTPUT, MPP_POLL_BLOCK);
        if (ret)
        {
            std::cerr << "Output poll failed: " << ret << std::endl;
            return false;
        }

        ret = mpi->dequeue(ctx, MPP_PORT_OUTPUT, &task);
        if (ret)
        {
            std::cerr << "Task output dequeue failed: " << ret << std::endl;
            return false;
        }

        mpp_task_meta_get_frame(task, KEY_OUTPUT_FRAME, &mpp_frame);

[HermanChen]

注意看下 mpi_dec_test 里的 advanced 流程里，packet 是从 MppBuffer 来的，是一个还 MppBuffer 的 packet 输入

[Lizi633]

那应该怎么把我的数据封装成MppBuffer？