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• can i use windows api function on ffmpeg code ?

  6 septembre 2020, par sooyongchoi

  I'm trying recording video from camera and receive timestamp when frame received.
I want to extracting timestamp each frame on Windows.
And I'm trying use this ffmpeg commandline.
Sync files timestamp with ffmpeg

  


  ffmpeg -f dshow -rtbufsize 1500M -video_size 1920x1080 -use_wallclock_as_timestamps 1 -copyts -r 60 -i video="0819-INOGENI 4K2USB3" -r 60 -vf setpts=PTS-STARTPTS -q 4 video4567.avi -c copy -f mkvtimestamp_v2 timings4567.txt

  


  but I want to timestamp based on GetSystemTimePreciseAsFileTime function, not unix epoch time for much better sensitive timer.

  


  So, I'm trying modifying to use GetSystemTimePreciseAsFileTime function mkvtimestamp_v2 code.
But it's error when make install processing.
like this : libavformat.a(mkvtimestamp_v2.o) : error LNK2019 : unresolved external symbol _GetSystemTimePreciseAsFileTime referenced in function _write_packet

  


  It seems like no link win32 api from ffmpeg code.

  


  Is there any way for linking win32 api for ffmpeg code ?

  


  thanks :)

  


• avcodec/cfhddata : Avoid code tables

  3 septembre 2022, par Andreas Rheinhardt

  avcodec/cfhddata : Avoid code tables
  cfhddata.c initializes a RL VLC table via code tables and
  
  corresponding tables for length, run and level. code and length
  
  tables are used to initialize a VLC, no symbol table is used.
  
  Afterwards the symbols of said VLC are just the indices of
  
  the corresponding entries in the code and length table that
  
  were used for initialization ; they can therefore be used
  
  to get the matching level and run entry and they are not used
  
  for anything else. Therefore one can just permute these tables
  
  without changing the resulting RL VLC tables.
  This commit does just this. It permutes these tables so that
  
  the code tables are ordered from left to right in the resulting
  
  tree and then switches to ff_init_vlc_from_lengths(), which
  
  allows to remove the codes table altogether.
  Given that these tables are constructed on the stack, this
  
  also reduces stack usage, potentially fixing part of #9399.
  
  (The size of the tables on the stack decreases from 4752 to
  
  2640.)
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/cfhddata.c

• Revision 88ba08818e : Fix bug in error handling that causes segfault See : https://code.google.com/p/c

  19 juin 2014, par Jim Bankoski

  Changed Paths :
   Modify /test/invalid_file_test.cc

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_decoder.c

  
  
  Fix bug in error handling that causes segfault

  See : https://code.google.com/p/chromium/issues/detail?id=362697

  The code properly catches an invalid stream but seg faults instead of
  returning an error due to a buffer not having been initialized. This
  code fixes that.

  Change-Id : I695595e742cb08807e1dfb2f00bc097b3eae3a9b