opencv read error:[h264 @ 0x8f915e0] error while decoding MB 53 20, bytestream -7

问题

My configuration:

  ubuntu 16.04
  opencv 3.3.1
  gcc version 5.4.0 20160609
  ffmpeg version 3.4.2-1~16.04.york0

and I built opencv with:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D PYTHON_EXECUTABLE=$(which python) -D OPENCV_EXTRA_MODULES_PATH=/home/xxx/opencv_contrib/modules -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_IPP=ON -D WITH_OPENNI2=ON -D WITH_V4L=ON -D WITH_FFMPEG=ON -D WITH_GSTREAMER=OFF -D WITH_OPENMP=ON -D WITH_VTK=ON -D BUILD_opencv_java=OFF -D BUILD_opencv_python3=OFF -D WITH_CUDA=ON -D ENABLE_FAST_MATH=1 -D WITH_NVCUVID=ON -D CUDA_FAST_MATH=ON -D BUILD_opencv_cnn_3dobj=OFF -D FORCE_VTK=ON  -D WITH_CUBLAS=ON -D CUDA_NVCC_FLAGS="-D_FORCE_INLINES" -D WITH_GDAL=ON -D WITH_XINE=ON -D BUILD_EXAMPLES=OFF -D BUILD_DOCS=ON -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF  -D BUILD_opencv_dnn=OFF -D BUILD_PROTOBUF=OFF -D opencv_dnn_BUILD_TORCH_IMPORTER=OFF -D opencv_dnn_PERF_CAFFE=OFF -D opencv_dnn_PERF_CLCAFFE=OFF -DBUILD_opencv_dnn_modern=OFF -D CUDA_ARCH_BIN=6.1 ..

and use these python code to read and show:

import cv2
from com.xxx.cv.core.Image import Image

capture=cv2.VideoCapture("rtsp://192.168.10.184:554/mpeg4?username=xxx&password=yyy")
while True:
    grabbed,content=capture.read()
    if grabbed:
        Image(content).show()
        doSomething()
    else:
        print "nothing grabbed.."

Everytime, after reading about 50 frames,it will give an error like:

[h264 @ 0x8f915e0] error while decoding MB 53 20, bytestream -7

then nothing can be grabbed further,and the strange thing is:

1,comment doSomething() or
2,keep doSomething() and recording the stream from same IPCamera,then run
  code against recorded video

both cases,code works fine,can anyone tell how to solve this problem?Thank in advance!

回答1:

I was facing this problem and I have just solved it now.

(Note: I am using python3)

I have suspected that it has something to do with the timing, because that error arises when doing expensive operations between consecutive capture.read(). Your question made me sure about this.

Also, the problem arises when I stream from my network camera (which uses H264 encoding) and there was no problem when using my laptop camera.

So the solution that worked for me is using multi-threading, with the python "threading" module. One thread streams and the other processes, while managing thread locks correctly so no read/write conflicts occur.

回答2:

This works only for video streaming :

all you gotta do is initialize cv2.VideoCapture again if the return is False. :)

worked for me.

vs = cv2.VideoCapture("rtsp://bla:bla@192.168.x.x")
while True:
    ret,frame = vs.read()
    if not(ret):
        st = time.time()
        vs = cv2.VideoCapture("rtsp://bla:bla@192.168.x.x")
        print("tot time lost due to reinitialization : ",time.time()-st)
        continue

    cv2.imshow("Current frame", frame)
    cv2.waitKey(0)

回答3:

I am using a hikvision ip poe camera with opencv 3.4 and python3 on a system having ubuntu 16.04. Camera is streaming in h264 format.

Using RTSP i am streaming from camera using videocapture of the opencv and sometimes i am having the same problems "[h264 @ 0x8f915e0] error while decoding MB 43 20, bytestream -4"

This problem is created when you use the captured frames in the further processing and you create a delay in the pipeline while the rtsp is still streaming.

The solution is to put the capture on a different thread and the frames you use on another thread.

You will have something like in the same process using multithreading with python:

#thread1 

global frame 
frame = None
cap = cv2.VideoCapture("rtsp://bla:bla@192.168.x.x")

while True:
ret,frame = cap.read()


#thread2

cv2.imshow("Current frame", frame)
cv2.waitKey(0)
# you can pass now the frame to your application for further processing

回答4:

I have same problem after 4 days research finally i solved the problem easy by this code: just try it once

for(;;) {
        if(!vcap.read(image)) {
            std::cout << "No frame" << std::endl;
            cv::waitKey();
        }
        cv::imshow("Output Window", image);
        if(cv::waitKey(1) >= 0) break;
    }

来源：https://stackoverflow.com/questions/49233433/opencv-read-errorh264-0x8f915e0-error-while-decoding-mb-53-20-bytestream

标签

OpenCV

ffmpeg

decode

ip-camera