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• Matlab - Capture Video Streams (part 2)

  25 novembre 2014, par Uri Merhav

  This is a follow up on this question. I’m trying to capture a live stream from an ip address (e.g. rtsp ://10.0.0.0:554/live.sdp). The only solution I’ve seen so far is to use mexopencv to call opencv’s streaming functionality from matlab. This has a very significant drawback, in that you need to get mexopencv to actually work on a mac, which is quite challenging.

  So, I was thinking about using the following approach :

  1. Use ffmpeg to stream the rtsp stream into a named pipe
  2. Read the named pipe from Matlab, just as if it was an ordinary video file (am I correct that this is how one uses a named pipe ? I’ve never used this kind of solution before)

  If this solution is inefficient, not going to work, or if there’s a better alternative — I’d love to hear about it !

• Moving files into sub folders based by average filesize

  5 février 2016, par darkshaed

  I need the help of you programming savants in creating a batch script or powershell script that will move and divide a group of files from one directory into 4 subdirectories based on an average total filesize. After the sort, the sub-directories should be roughly equal in terms of folder size.

  Why do I need this ?

  I have 4 computers that I would like to utilize for encoding via FFMPEG and it would be helpful for a script to divide a folder into 4 parts (sub-directories) based on a total average size.

  So lets say there are an assortment of movie files with varying different file sizes totaling to 100 GB, the script would divy the movie files and move them into 4 sub folders ; each folder having around 25 GB. Doing this will allow the 4 machines to encode the sum of the data equally and efficiently.

  After all that encoding I’ll have 2 files, XYZ.(original Extension) and XYZ.264, A script that could compare the 2 files and delete the larger file would be extremely helpful and cut down on manual inspection.

  Thank you, I hope this is possible.

• Undefined Reference for 1 of many constructors for QVideoFrame

  26 novembre 2013, par Robadob

  I've come across a weird issue while trying to convert an FFMPeg AVFrame to a QT QVideoFrame ;

  I'm trying to create the QVideoFrame using this constructor

  QVideoFrame(int bytes, const QSize &size, int bytesPerLine, PixelFormat format);

  It compiles fine, however at link I receive the issue ;

  ~myfile.cpp:130: undefined reference to `_imp___ZN11QVideoFrameC1EiRK5QSizeiNS_13AVPixelFormatE'
  
  collect2.exe: error: ld returned 1 exit status

  (As it's a linker issue, I'm presuming you won't want code examples).

  I've compiled QT 4.8.5 myself using mingw32 and the other constructors (no params and QImage param) for QVideoFrame that I've tested compile and link correctly. From looking at the QT sources there is nothing that stands out as different for this constructor for it to not be included in the library.

  At this point I'm trying to implement an extension of QAbstractVideoBuffer so I can use that constructor, however that's proving harder than it should be & I'd love to understand why this issue is occurring.

  Thanks