When I tried to decode real time H264 stream over VPU decoder, I received following log:
[INFO] Display fps will be 30
[INFO] vpu needs more bitstream in rollback mode frame_id = 0
[INFO] Num of Error Mbs : 4656, in Frame : 0
VPU doesn't have picture to be displayed.toutinfo.indexFrameDisplay = -3, -1
[INFO] Num of Error Mbs : 4656, in Frame : 0
VPU doesn't have picture to be displayed.toutinfo.indexFrameDisplay = -3, -3
VPU doesn't have picture to be displayed.toutinfo.indexFrameDisplay = -3, -3
VPU doesn't have picture to be displayed.toutinfo.indexFrameDisplay = -3, -3
It seems that VPU decoder will cache several frames before display the first beginning frame. Why? And how can I do to display the frame in real time without any delay? Thanks a lot.
Hi li
one can look at below explanations and solutions for vpu latency
imx53 latency with h264 and udpsrc
https://community.nxp.com/thread/308415
Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Hi igorpadykov,
Thanks for your nice reply. I can not find the solution in those explanations. I try to describe the detail of my question as bellow.
I transmit the H264 stream (1080p@25fps) over cable network (UDP Socket) to the imx6dl demo board (linux version), the demo board receives the stream, and tries to decode it by VPU demo application. Now I found that VPU decoder will cache 5 frames before it decodes the first beginning frame. The total latency of the streaming is about 500ms.
But when I redirect the H264 stream from the demo board to the cellphone over wifi, and play the stream, to total latency is just about 300ms.
So I guess the cache behavior of the VPU decoder causes the bigger latency. How can I remove the cache behavior to reduce the latency? Is there any params to set in the VPU library to ignore the cache behavior? Many thanks.