closed acquireFrame() lose images

hi!

My code is based on 09_camera_jpeg_capture.And I use 3 cameras,and each has 30fps.I want to save every image,but i find acquireFrame() not working well,it allway lose some images? Is there any way to fix it?

After 180 seconds,I checked the result,and find some frame not received.
Camera0 e.g,first frameid(image_frame_id) is 1,and my receive index is 1 too.and last frameid(image_frame_id) is 938,but my receive index is 934. so is that means the program lost 938-934=4 images?

bool CaptureConsumerThread::threadExecute() {
IStream *iStream = interface_cast(m_stream);
IFrameConsumer *iFrameConsumer = interface_cast(m_consumer);

// Wait until the producer has connected to the stream.
CONSUMER_PRINT("Waiting until producer is connected...\n");
if (iStream->waitUntilConnected() != STATUS_OK)
    ORIGINATE_ERROR("Stream failed to connect.");
CONSUMER_PRINT("Producer has connected; continuing.%d,\n",m_cameraIndex);

int current_camera_recv_index = 0;
while (true) {
    // Acquire a frame.
    UniqueObj <Frame> frame(iFrameConsumer->acquireFrame());
    IFrame *iFrame = interface_cast<IFrame>(frame);
    if (!iFrame)
        break;

    // Get the IImageNativeBuffer extension interface.
    NV::IImageNativeBuffer *iNativeBuffer =
            interface_cast<NV::IImageNativeBuffer>(iFrame->getImage());
    if (!iNativeBuffer)
        ORIGINATE_ERROR("IImageNativeBuffer not supported by Image.");

    // If we don't already have a buffer, create one from this image.
    // Otherwise, just blit to our buffer.
    if (m_dmabuf == -1) {
        printf("error 0\r\n");
        m_dmabuf = iNativeBuffer->createNvBuffer(CAPTURE_SIZE,
                                                 NvBufferColorFormat_YUV420,
                                                 NvBufferLayout_BlockLinear);
        if (m_dmabuf == -1)
            CONSUMER_PRINT("\tFailed to create NvBuffer\n");
    } else if (iNativeBuffer->copyToNvBuffer(m_dmabuf) != STATUS_OK) {
        printf("error 1\r\n");
        ORIGINATE_ERROR("Failed to copy frame to NvBuffer.");
    }

    unsigned long size = JPEG_BUFFER_SIZE;
    unsigned char *buffer = m_OutputBuffer;
    m_JpegEncoder->encodeFromFd(m_dmabuf, JCS_YCbCr, &buffer, size);

    current_camera_recv_index ++;

    printf("camera_index: %d, image_frame_id: %d,current_camera_index: %d,thread: %lu\r\n",
           m_cameraIndex,(unsigned int)iFrame->getNumber(),current_camera_recv_index,all_camera_recv_image_count,pthread_self());
}

CONSUMER_PRINT("Done.\n");

requestShutdown();

return true;

}

-------------------------------------output results-----------------------------------

camera_index: 1, image_frame_id: 1,current_camera_index: 1,thread: 545758192016
camera_index: 0, image_frame_id: 1,current_camera_index: 1,thread: 545774104976
camera_index: 1, image_frame_id: 3,current_camera_index: 2,thread: 545758192016
camera_index: 0, image_frame_id: 3,current_camera_index: 2,thread: 545774104976
camera_index: 1, image_frame_id: 4,current_camera_index: 3,thread: 545758192016
camera_index: 0, image_frame_id: 4,current_camera_index: 3,thread: 545774104976
camera_index: 2, image_frame_id: 1,current_camera_index: 1,thread: 545742279056
camera_index: 2, image_frame_id: 3,current_camera_index: 2,thread: 545742279056
camera_index: 1, image_frame_id: 5,current_camera_index: 4,thread: 545758192016
camera_index: 0, image_frame_id: 5,current_camera_index: 4,thread: 545774104976
camera_index: 2, image_frame_id: 4,current_camera_index: 3,thread: 545742279056



camera_index: 0, image_frame_id: 938,current_camera_index: 934,thread: 545774104976
camera_index: 1, image_frame_id: 941,current_camera_index: 935,thread: 545758192016
camera_index: 2, image_frame_id: 940,current_camera_index: 939,thread: 545742279056

IOutputStreamSettings::setMode(STREAM_MODE_FIFO);

Hi,
We suggest you remove JPEG encoding first to make sure sensors can offer steady 30fps.
It is more accurate to check sensor timestamps. For 30 fps, it should be in 33ms interval.

Here is a sample of getting timestamps from metadata:
https://devtalk.nvidia.com/default/topic/1028387/jetson-tx1/closed-gst-encoding-pipeline-with-frame-processing-using-cuda-and-libargus/post/5256753/#5256753

Please also share information of your camera board. We have camera partners such as Leopard, E-con. Also what is your resolution, 4K or 1080p?