mpp_rt: NOT found drm allocator

msmmbl

使用了官方的debian，尝试使用自带的gstreamer将h264硬件编码时候出现了下面的错误。

1. gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-raw,fmormat=NV12,width=1920,height=1080 ! mpph264enc ! rtph264pay ! udpsink host=192.168.11.144 port=5600
   
2. Setting pipeline to PAUSED ...
   
3. mpp[1956]: mpp_info: mpp version: unknown mpp version for missing VCS info
   
4. mpp[1956]: mpp_rt: NOT found ion allocator
   
5. mpp[1956]: mpp_rt: NOT found drm allocator
   
6. Pipeline is live and does not need PREROLL ...
   
7. Setting pipeline to PLAYING ...
   
8. New clock: GstSystemClock
   
9. ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data stream error.
   
10. Additional debug info:
    
11. gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
    
12. streaming stopped, reason not-negotiated (-4)
    
13. Execution ended after 0:00:00.000743479
    
14. Setting pipeline to PAUSED ...
    
15. Setting pipeline to READY ...
    
16. Setting pipeline to NULL ...
    
17. Freeing pipeline ...

复制代码

我觉得主要还是下面的
mpp_rt: NOT found drm allocator

看到github上，https://github.com/rockchip-linux/mpp/issues/383，提到正常都会有drm allocator。为啥我这个没有。

另外看到有些帖子还提到通过ssh访问这个条命令无效。1126-JD4配的这块底板板子没有hdmi输出，有没有什么办法能快速尝试这条命令。

msmmbl

看了mpp源码后明白了，它依赖/dev/dri/card0设备，所以需要在dts中开启一个dsi