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• avutil/hwcontext_dxva2 : Don’t improperly free IDirect3DSurface9 objects

  16 mai 2017, par Aaron Levinson

  avutil/hwcontext_dxva2 : Don’t improperly free IDirect3DSurface9 objects
  Add dxva2_pool_release_dummy() and use it in call to
  
  av_buffer_create() in dxva2_pool_alloc().
  Prior to this change, av_buffer_create() was called with NULL for the
  
  third argument, which indicates that av_buffer_default_free() should
  
  be used to free the buffer’s data.  Eventually, it gets to
  
  buffer_pool_free() and calls buf->free() on a surface object (which is
  
  av_buffer_default_free()).
  This can result in a crash when the debug version of the C-runtime is
  
  used on Windows.  While it doesn’t appear to result in a crash when
  
  the release version of the C-runtime is used on Windows, it likely
  
  results in memory corruption, since av_free() is being called on
  
  memory that was allocated using
  
  IDirectXVideoAccelerationService::CreateSurface().
  Signed-off-by : Aaron Levinson <alevinsn@aracnet.com>
  
  Reviewed-by : wm4 <nfxjfg@googlemail.com>
  
  Reviewed-by : Steven Liu <lingjiujianke@gmail.com>
  
  Reviewed-by : Mark Thompson <sw@jkqxz.net>
  
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavutil/hwcontext_dxva2.c

• qsvenc : Make sure the interlaced encoding works

  6 mai 2017, par Aaron Levinson

  qsvenc : Make sure the interlaced encoding works
  Purpose : qsvenc : make sure that interlaced encoding works.  Also,
  
  reduce the vertical alignment constraint when possible to reduce
  
  memory usage.
  Note : Most of this code used to be present in ffmpeg and was
  
  eliminated in revision 1f26a23 on Oct. 31, 2016 (qsv : Merge libav
  
  implementation, at
  
  https://github.com/FFmpeg/FFmpeg/commit/1f26a231bb065276cd80ce02957c759f3197
  
  edfa#diff-7d84a34d58597bb7aa4b8239dca1f9f8).  Already applied to
  
  libav.
  Reviewed-by : Luca Barbato <lu_zero@gentoo.org>
  
  (cherry picked from commit 8fd8f91e47f33cd82371a97ac81afc476144964f)
  
  Signed-off-by : Mark Thompson <sw@jkqxz.net>
  
  Signed-off-by : Aaron Levinson <alevinsn@aracnet.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/qsvenc.c
  • [DH] libavcodec/qsvenc.h

• find the timestamp of a sound sample of an mp3 with linux or python

  23 juin 2020, par cardamom

  I am slowly working on a project which where it would be very useful if the computer could find where in an mp3 file a certain sample occurs. I would restrict this problem to meaning a fairly exact snippet of the audio, not just for example the chorus in a song on a different recording by the same band where it would become more some kind of machine learning problem. Am thinking if it has no noise added and comes from the same file, it should somehow be possible to locate the time at which it occurs without machine learning, just like grep can find the lines in a textfile where a word occurs.

  


  In case you don't have an mp3 lying around, can set up the problem with some music available on the net which is in the public domain, so nobody complains :

  


  curl https://web.archive.org/web/20041019004300/http://www.navyband.navy.mil/anthems/ANTHEMS/United%20Kingdom.mp3 --output godsavethequeen.mp3


  


  It's a minute long :

  


  exiftool godsavethequeen.mp3 | grep Duration
Duration                        : 0:01:03 (approx)


  


  Now cut out a bit between 30 and 33 seconds (the bit which goes la la la la..) :

  


  ffmpeg -ss 30 -to 33 -i godsavethequeen.mp3 gstq_sample.mp3


  


  both files in the folder :

  


  $ ls -la
-rw-r--r-- 1 cardamom cardamom   48736 Jun 23 00:08 gstq_sample.mp3
-rw-r--r-- 1 cardamom cardamom 1007055 Jun 22 23:57 godsavethequeen.mp3


  


  This is what am after :

  


  $ findsoundsample gstq_sample.mp3 godsavethequeen.mp3
start 30 end 33


  


  Am happy if it is a bash script or a python solution, even using some kind of python library. Sometimes if you use the wrong tool, the solution might work but look horrible, so whichever tool is more suitable. This is a one minute mp3, have not thought yet about performance just about getting it done at all, but would like some scalability, eg find ten seconds somewhere in half an hour.