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• ffmpeg Live Input MP4 Error [migrated]

  3 mars 2013, par Brianjs

  Currently I have a mic and a webcam connected to my computer. I am running ffmpeg on CentOS 6.3.

  When I try to record a video without audio by :

  ffmpeg -y -f video4linux2 -t 15 -s 640x480 -r 25 -i /dev/video0 /home/irdb/Desktop/out2.mp4

  it runs perfectly and I get a nice video. However when I try to run with audio included by :

  ffmpeg -y -f video4linux2 -t 15 -s 640x480 -r 25 -i /dev/video0 -f alsa -ar 22050 -ab 64k -ac 2 -i default /home/irdb/Desktop/out2.mp4

  It errors out and prints :

  [NULL @ 0x1e33fc0] Codec is experimental but experimental codecs are not enabled,      see -strict -2
  
  Output #0, mp4, to '/home/irdb/Desktop/out2.mp4':
  
  Stream #0:0: Video: h264, yuv420p, 640x480, q=-1--1, 90k tbn, 25 tbc
  
  Stream #0:1: Audio: none, 22050 Hz, 2 channels, flt, 128 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Stream #1:0 -> #0:1 (pcm_s16le -> aac)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such    as bit_rate, rate, width or height

  I assume this has to do with the first error as when I use something like mpg it works just fine. However I plan on streaming this live and want mp4 format as that is pretty much supported by all browsers (Firefox with flash fallback).

  Does anyone know how to get the audio to work without additional processing (as I want to stream live and not write to a file eventually).

• OpenCV libopencv_core.so.2.4.1 File Not Found

  8 décembre 2017, par benrules2

  I am trying to setup OpenCV v2.4.1 with FFMPEG v0.11 support on Scientific Linux SL release 5.0 (Boron), and I am running into a problem with a missing file that seems completely undocumented. The error I am getting is as follows :

  -- Install configuration: "Release"
  
  
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cv.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cxmisc.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cvwimage.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv2/opencv.hpp
  
  CMake Error at modules/core/cmake_install.cmake:63 (FILE):
  
  file INSTALL cannot find file
  
    "/home/s18/s1138832/OpenCV/lib/libopencv_core.so.2.4.1" to install.
  
  Call Stack (most recent call first):
  
    modules/cmake_install.cmake:57 (INCLUDE)
  
    cmake_install.cmake:56 (INCLUDE)

  I honestly don’t know where to begin troubleshooting this at this point. I successfully installed without ffmpeg a few days ago, but now I can’t even install with ffmpeg support set to off.

  The files that link to the missing library are :

  lrwxrwxrwx 1 s1138832 s18      21 Jun 17 18:26 libopencv_core.so ->    libopencv_core.so.2.4
  
  lrwxrwxrwx 1 s1138832 s18      23 Jun 17 18:26 libopencv_core.so.2.4 -> libopencv_core.so.2.4.1

  Any advice or prods in the right direction would be much appreciated. I would also be happy to provide more info on whatever interesting details I may have omitted.

  UPDATES : This website seems to have the same error, but I can’t read it and translations patchy - http://www.opencv.org.cn/forum/viewtopic.php?f=1&t=15664 ( http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.opencv.org.cn%2Fforum%2Fviewtopic.php%3Ff%3D1%26t%3D15664&act=url )

  libopencv_core.so.2.4.1 exists after "make", but "make install" deletes it somehow. I copied it and added it again, but it didn’t change anything

• OpenCV libopencv_core.so.2.4.1 File Not Found

  14 novembre 2013, par benrules2

  I am trying to setup OpenCV v2.4.1 with FFMPEG v0.11 support on Scientific Linux SL release 5.0 (Boron), and I am running into a problem with a missing file that seems completely undocumented. The error I am getting is as follows :

  -- Install configuration: "Release"
  
  
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cv.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cxmisc.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cvwimage.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv2/opencv.hpp
  
  CMake Error at modules/core/cmake_install.cmake:63 (FILE):
  
  file INSTALL cannot find file
  
    "/home/s18/s1138832/OpenCV/lib/libopencv_core.so.2.4.1" to install.
  
  Call Stack (most recent call first):
  
    modules/cmake_install.cmake:57 (INCLUDE)
  
    cmake_install.cmake:56 (INCLUDE)

  I honestly don't know where to begin troubleshooting this at this point. I successfully installed without ffmpeg a few days ago, but now I can't even install with ffmpeg support set to off.

  The files that link to the missing library are :

  lrwxrwxrwx 1 s1138832 s18      21 Jun 17 18:26 libopencv_core.so ->    libopencv_core.so.2.4
  
  lrwxrwxrwx 1 s1138832 s18      23 Jun 17 18:26 libopencv_core.so.2.4 -> libopencv_core.so.2.4.1

  Any advice or prods in the right direction would be much appreciated. I would also be happy to provide more info on whatever interesting details I may have omitted.

  UPDATES : This website seems to have the same error, but I can't read it and translations patchy - http://www.opencv.org.cn/forum/viewtopic.php?f=1&t=15664 ( http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.opencv.org.cn%2Fforum%2Fviewtopic.php%3Ff%3D1%26t%3D15664&act=url )

  libopencv_core.so.2.4.1 exists after "make", but "make install" deletes it somehow. I copied it and added it again, but it didn't change anything