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• Video Codec For Commercial Use [on hold]

  17 décembre 2015, par mFeinstein

  I am new in video programming and I need to make a commercial application that needs to export some video. I was going to use OpenCV, but the documentation says it can’t write a video larger than 2Gb and that’s not something that my project can tolerate.

  I have an industrial camera and I will receive each frame of the camera in my C++ code and I want to transform the frames in a video. So far I am thinking about using FFmpeg for the video generation, but I am afraid of all these patented codecs.

  Are there any codecs that are free for commercial use ?

  Edit :

  Some are flaging this post as not related to programing or opinion based.

  1. I am not asking for an opinion, but a list of commercial free codecs. I am not asking which are good or bad (which is opinion based) I just can’t find a list online.

  2. This is about programing, there are lots of posts here in SO about legal issues on software like licensing, there is even one with a "legal" tag. I found many posts related to codecs licenses but none with a list of free ones. Of course this is programing related, I will develop and architecture my code around my options.

• OpenCV VideoCapture can't read from stream

  18 décembre 2018, par Josep Valls

  I can open a stream in VLC but in OpenCV I cannot capture frames. (Python 2.7, OpenCV 3.4.3 binary distribution x86, Windows 10). I’ve been following this guide : https://medium.com/@tomgrek/hackers-guide-to-the-aws-deeplens-1b8281bc6e24 but I cannot seem to read from random streams online (not sure whether I should be able to, I saw this question opencv videocapture can’t open MJPEG stream about compiling with ffmpeg but I just downloaded the binary available in Sourceforge).

  • I am using an AWS Deeplens, updated to the latest version.

  • Installed ffmpeg, latest version.

  Then, in /etc/ffserver.conf I added :

  <stream>
  
  File "/opt/awscam/out/ch1_out.h264"
  
  VideoFrameRate 6
  
  VideoSize 320x240
  
  NoAudio
  
  </stream>
  
  
  
  <stream>
  
  File "/opt/awscam/out/ch2_out.mjpeg"
  
  VideoFrameRate 3
  
  VideoSize 640x480
  
  Format mjpeg
  
  NoAudio
  
  </stream>

  • I start ffserver -f /etc/ffserver.conf
  • On my Windows machine, I use WSL and open an SSH tunnel into the AWS Deeplens ssh -L 8090:localhost:8090 aws_cam@192.168.0.10
  • At this point, in my Windows machine I can open VLC and if I point to http://localhost:8090/camera.mjpeg I can see the stream from the camera.

  But if I run the following code :

  cam = cv2.VideoCapture("http://localhost:8090/camera.mjpeg")
  
  success, frame = cam.read()
  
  opened = cam.isOpened()
  
  success, frame, opened

  I get :

  False, None, False

  If I browse to http://localhost:8090/stat.html, I see :

  Available Streams
  
  Path    Served Conns     bytes  Format  Bit rate kbits/s    Video kbits/s   Codec   Audio kbits/s    Codec  Feed
  
  test1.mpg   0   0   mpeg    96  64  mpeg1video  32  mp2 feed1.ffm
  
  test.asf    0   0   asf_stream  320 256 msmpeg4 64  wmav2   feed1.ffm
  
  stat.html   17  42150   -   -   -       -   
  
  index.html  0   0   -   -   -       -   
  
  camera.h264 3   6805k   h264    0   0   libx264 0       /opt/awscam/out/ch1_out.h264
  
  camera.mjpeg    12  41073k  mjpeg   0   0   mjpeg   0       /opt/awscam/out/ch2_out.mjpeg

  And every time I call VideoCapture() I see how the number of Served for the camera.mjpeg stream increased by a 2 or 3 and the bytes, increases a few megabytes but I don’t see anything in OpenCV. I have not tried any other video device in my Windows 10 but I can read images no problem. I also tried a random stream online, also opens in VLC but not in OpenCV, tried this one : http://136.176.70.200/mjpg/video.mjpg

  Any ideas ?

• How to read .mp4 files in opencv

  9 mai 2016, par Noah

  I am totally newbie in OpenCV, C++. Trying to read an mp4 video but found OpenCV does not support mp4, it only reads avi(I am not sure whether I am write or wrong). After an online research came to know ffmpeg is the best option to convert mp4 to avi for further processing.

  I am using OpenCV 3.0 with visual studio 2012. I saw there is a dll file, opencv_ffmpeg300.dll in OpenCV C:\opencv\build\x86\vc11\bin folder. Is there any way I can use this dll file to read and convert my video ?

  It will be really appreciating if someone can provide me some guidelines, I am lost in the OpenCV world totally.

  For video,

  Video I/O:
  
     Video for Windows:           YES
  
     DC1394 1.x:                  NO
  
     DC1394 2.x:                  NO
  
     FFMPEG:                      YES (prebuilt binaries)
  
       codec:                     YES (ver 55.18.102)
  
       format:                    YES (ver 55.12.100)
  
       util:                      YES (ver 52.38.100)
  
       swscale:                   YES (ver 2.3.100)
  
       resample:                  NO
  
       gentoo-style:              YES
  
     OpenNI:                      NO
  
     OpenNI PrimeSensor Modules:  NO
  
     OpenNI2:                     NO
  
     PvAPI:                       NO
  
     GigEVisionSDK:               NO
  
     DirectShow:                  YES
  
     Media Foundation:            NO
  
     XIMEA:                       NO
  
     Intel PerC:                  NO