mp4mux with h264 stream from appsrc - Could not multiplex stream.

[dlw]

I have built the following pipeline:

appsrc->videoconvert->x264enc->h264parse->queue->mp4mux->filesink

The goal is to record video from a non-v4l2 camera.  I get the following
error:

`Could not multiplex streams`

I have no problem streaming this h264 pipeline (if I replace the
queue->mp4mux->filesink section with a rtph264pay and udpsink I receive
video fine.

[Pipeline image is here](https://imgur.com/D0sbFMx)

As for implementing the appsrc, I am using the need-data callback as quite a
few examples demonstrate:


cb_need_data(GstElement *appsrc,
        guint       unused_size,
        gpointer    data)
{
    GstMapInfo map;
    GstBuffer *buffer;
    guint pixel_size;
    GstFlowReturn ret;

    // setup the image buffer from the camera
    pixel_size = (size_t)camera->frame_cols * (size_t)camera->frame_rows;
    guint frame_bytes = pixel_size * sizeof(uint32_t);
    uint32_t* color_buffer  = (uint32_t*)malloc(frame_bytes);

    buffer = gst_buffer_new_allocate (NULL, frame_bytes, NULL);

    //get the image from the camera
    bool status = false;
    status = MyCamera_GetImage(camera, color_buffer);

    if(status){
        // map memory, write data to memory and unmap
        gst_buffer_map(buffer, &map, GST_MAP_WRITE);
        memcpy(map.data, (guchar*)color_buffer, frame_bytes);
        gst_buffer_unmap(buffer, &map);

        // send buffer out of appsrc
        g_signal_emit_by_name (appsrc, "push-buffer", buffer, &ret);
        gst_buffer_unref (buffer);
    } 
    free(color_buffer);
}

I am using gstreamer 1.14.5 on ubuntu 18.04 arm64 (Jetson Nano)


Any help or guidance would be appreciated on how I mux this stream into a
video file.



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