gstreamer-rockchip保存h264视频最后部分出错以及无法获得frame#

1. 通过dnf安装gstreamer-rockchip和mpp

1. $ sudo dnf install gstreamer-rockchip librockchip_rga librockchip_rtsp librockchip_vendor librockchip_isp librockchip_drm librockchip_mpp librockchip_rga-devel librockchip_rtsp-devel librockchip_vendor-devel librockchip_mpp-tests librockchip_drm-devel librockchip_mpp-devel

复制代码2. 验证gstreamer plugins

1. $ gst-inspect-1.0 |grep rockchip
   
2. rockchipmpp:  mppjpegdec: Rockchip's MPP JPEG image decoder
   
3. rockchipmpp:  mppjpegenc: Rockchip Mpp JPEG Encoder
   
4. rockchipmpp:  mpph264enc: Rockchip Mpp H264 Encoder
   
5. rockchipmpp:  mppvideodec: Rockchip's MPP video decoder

复制代码3. 使用opencv C++ API打开并保存视频文件

VideoCapture cap("/home/toybrick/Downloads/input.mp4");
printf("frame count: %d\n", cap.get(CV_CAP_PROP_FRAME_COUNT));
VideoWriter video("output.avi", CV_FOURCC('X', '2', '6', '4'), 30, Size(640, 480));
    while (cap.isOpened()) {
    cap >> frame;
  video.write(frame);
}

4. 运行以上程序得到的console信息

1. Failed to query video capabilities: Inappropriate ioctl for device
   
2. libv4l2: error getting capabilities: Inappropriate ioctl for device
   
3. VIDEOIO ERROR: V4L: device /home/toybrick/input.mp4: Unable to query number of channels
   
4. mpi: mpp version: Without VCS info
   
5. mpp_rt: NOT found ion allocator
   
6. mpp_rt: found drm allocator
   
7. mpp: deprecated block control, use timeout control instead
   
8. warning: GStreamer: unable to query duration of stream (/builddir/build/BUILD/opencv-3.4.1/modules/videoio/src/cap_gstreamer.cpp:904)
   
9. warning: Cannot query video position: status=1 value=0 duration=-1
   
10. (/builddir/build/BUILD/opencv-3.4.1/modules/videoio/src/cap_gstreamer.cpp:952)
    
11. frame count: -1
    
12. mpi: mpp version: Without VCS info
    
13. h264e_api: h264e_config MPP_ENC_SET_RC_CFG bps 1555200 [1458000 : 1652400]
    
14. **
    
15. ERROR:gstmppvideoenc.c:115:gst_mpp_video_enc_stop: assertion failed: (g_atomic_int_get (&self->active) == FALSE)
    
16. Aborted (core dumped)

复制代码

这里面有两个问题，都应该很容易复现：
1. mpph264enc plugin assert. 这个会导致视频最后几帧无法写入。
2. CV_CAP_PROP_FRAME_COUNT读出来的frame count = -1。这会导致程序无法确定输入视频的长度(duration)。

Anyone can help? It's very easy to reproduce...

没有啊，视频基本是可以保存，但是由于最后mpp encoding crash会丢几帧。而且拿不到duration啊，没人能解决吗？