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• avformat/rmdec : Fix memleaks upon read_header failure

  20 juillet 2020, par Andreas Rheinhardt

  avformat/rmdec : Fix memleaks upon read_header failure
  For both the RealMedia as well as the IVR demuxer (which share the same
  
  context) each AVStream's priv_data contains an AVPacket that might
  
  contain data (even when reading the header) and therefore needs to be
  
  unreferenced. Up until now, this has not always been done :
  The RealMedia demuxer didn't do it when allocating a new stream's
  
  priv_data failed although there might be other streams with packets to
  
  unreference. (The reason for this was that until recently rm_read_close()
  
  couldn't handle an AVStream without priv_data, so one had to choose
  
  between a potential crash and a memleak.)
  The IVR demuxer meanwhile never ever called read_close so that the data
  
  already contained in packets leaks upon error.
  This patch fixes both demuxers by adding the appropriate cleanup code.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/rmdec.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 a MS-DRM client library for linux ?

  19 juin 2016, par qrtt1

  I have used the libraries (libavformat and libavcodec) to decode some MMS streaming urls. But some of them are protected by DRM. When I try to decode them, the library will warn about it

  In libavformat/asfdec.c :

  if (!s->keylen) {
  
      if (!guidcmp(&g, &ff_asf_content_encryption)) {
  
          av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
  
      } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
  
          av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
  
      } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
  
          av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
  
      }
  
  }

  The variable s is the struct AVFormatContext. My question is where to get the key ? It seems to decode it with a DRM key.

  ---

  I look the ASF Spec, and try to patch asfdec.c. Now, I have the acquiring license URL and key id. The problem can rewrite as ’Is there a MS-DRM client library for linux ?’ (old : How to decode a MMS streaming url with DRM by ffmpeg ?)

  Is it possible to use the license url and key id to get content key ?