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• Revision c040f96e4b : mips msa vp9 subtract block optimization average improvement 3x-4x Change-Id :

  26 juin 2015, par Parag Salasakar

  Changed Paths :
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Add /vp9/encoder/mips/msa/vp9_subtract_msa.c

  
   Modify /vp9/vp9cx.mk

  
  
  mips msa vp9 subtract block optimization

  average improvement 3x-4x

  Change-Id : Idbe4d13a00d05ff8be6559b116f416e42c3b4097

• warning : Could not find codec parameters

  22 juin 2015, par kylel95

  import numpy as np
  
  import cv2
  
  
  
  cap = cv2.VideoCapture('camera10.h264') #Captures h264 file from folder
  
  while(cap.isOpened()):``
  
      ret, frame = cap.read()
  
  
  
      gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
  
  
      cv2.imshow('frame', gray)
  
      if cv2.waitKey(20) & 0xFF == ord('q'):
  
          break
  
  
  
  cap.release()
  
  cv2.destroyAllWindows()

  Once I run this code I get : warning :

  Could not find codec parameters (../../modules/highgui/src/cap_ffmpeg_impl.hpp:556).

  Does anyone know what the problem is please ?

• Qt C++ ffmpeg cannot find library

  7 juin 2013, par Carnifrex

  I use Qt 5.0.2 with Mingw 4.7 on windows.

  I'm working on a c++ program and i'm trying to get the duration of video files. I found ffmpeg. Now i tried to compile a simple program but I think it fails with the libraries. I've tried to include both the shared and dev but they both will fail. ( Zeranoe FFmpeg builds)

  This is my pro file :

  TEMPLATE = app
  
  CONFIG += console
  
  CONFIG -= app_bundle
  
  CONFIG -= qt
  
  
  
  SOURCES += main.cpp
  
  
  
  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-shared\bin
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-shared\bin -lavcodec-55.dll -     lavformat-55.dll -lavutil-52.dll

  i get errors like :

  " :-1 : error : cannot find -lavcodec-55.dll"

  " :-1 : error : cannot find -lavformat-55.dll"

  I've also tried :

  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-dev\include
  
  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-dev\lib
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-dev\lib -lavcodec -lavformat -lavutil
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-dev\lib -llibavcodec.dll.a -llibavformat.dll.a -llibavutil.dll.a

  Here it gives a error "During startup program exited with code 0x0000135'

  I even tried to include each library individually. But no results..

  This is my main file :

  #include <iostream>
  
  using namespace std;
  
  extern "C" {
  
    #include <libavcodec></libavcodec>avcodec.h>    // required headers
  
    #include <libavformat></libavformat>avformat.h>
  
  }
  
  int main(int argc, char**argv) {
  
     av_register_all();             // offending library call
  
     return 0;
  
  }
  
  </iostream>

  A program simple as this will have 2 outcomes :

  1. the program runs but crashes if i call 'av_register_all()'
  2. It just tells me he cannot find the libraries.

  Can someone tell me what it is i'm doing wrong ? Or even give me a hint ? I can't really find a lot of good documentation on this one.

  Thanks in advance !