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• avformat/dashdec : Fix leak of string on error when parsing representation

  19 septembre 2020, par Andreas Rheinhardt

  avformat/dashdec : Fix leak of string on error when parsing representation
  The DASH demuxer currently extracts several strings at once from an xml
  
  document before processing them one by one ; these strings are allocated,
  
  stored in local variables and need to be freed by the demuxer itself.
  
  So if an error happens when processing one of them, all strings need to
  
  be freed before returning. This has simply not been done, leading to
  
  leaks.
  A simple fix would be to add the necessary code for freeing ; yet there is
  
  a better solution : Avoid having several strings at the same time by
  
  extracting a string, processing it and immediately freeing it. That way
  
  one only has to free at most one string on error.
  Reviewed-by : Steven Liu <lq@chinaffmpeg.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/dashdec.c

• CaptionManager - easily add and remove captions from QT movies

  18 février 2010

  Cough. Yeah. Remember this blog ? Right then.

  Here’s a new little app to add and remove caption tracks (SCC files) from Quicktime files. In theory you can do this with Quicktime Pro, but it doesn’t seem to work so well anymore.

  This zip file includes the source for the app, Xcode project, and a compiled build.

  Basically, you can open a quicktime movie, and it’ll detect whether there are already captions or not. Then you can strip the captions if they already exist (plus an associated TC track) or add new captions from an SCC file. You’ll either need to be on Snow Leopard or have the Caption Component installed. The built version is Intel only, though you could probably compile a PPC version if you were so inclined.

  The app writes out a new file, rather than updating in place, due to some limitations in QTKit.

  For the command line, running ./CaptionManager.app/Contents/MacOS/CaptionManager -help will give you the relevant info.

  No license attached, because I still don’t understand the implications of BSDing stuff created on the University’s dime.

  CaptionManager.zip

  Oh also, the GUI leaks a little memory. Deal. I’ve also posted a screencast of the app.

• Is there anyway to tell if an openCV cap.read() call will fail before it begins to parse a video ?

  18 novembre 2022, par aris-t

  Problem : I am per frame parsing very long videos with a complex algorithm for AI applications in python. This is a slow and long process even using multiprocessing and threading tricks. Therefore it is very annoying when it dies half way through its process due to an open CV issue with the video.

  


  Request : Does anyone know a good way in python for open cv to raise an error before it begins to parse a video if the video would later throw a fatal error or None from cap.read() ? An added bonus would for the solution to at least give me a frame number and a reason so that I may edit or reconvert the video to fix this.

  


  Latest Issue :

  


  [h264 @ 0x41cad80] Invalid NAL unit size (-66445153 > 10189).
[h264 @ 0x41cad80] Error splitting the input into NAL units.


  


  Thanks in advance.