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• Different results between windows and Linux in opencv c++

  24 mars 2020, par Samer

  I have tried this opencv and ffmpeg C++ code to demux a video and edit it and mux it back again but it doesn’t seem to work properly on windows (using Visual Studio)

  the problem occurs by skipping some frames especially at the end of the video and increasing the video output size not on all windows PCs. We have tried it on a 35 MB video and when we did the editing the output video size was 2.8GB on some windows PCs and the last frames skipped (the problem) and some other PCs the output video size was 500MB and there were no skipped frames (all fine).

  so the question is, why would the same code with the same build and windows versions behave differently and produce problems on some Pcs ?

  (we also did it on linux ubuntu and macos and it was working fine on different PCs)

  https://github.com/WajdiMuh/parallelalgo for the files

  https://gjuedujo-my.sharepoint.com/personal/m_albizreh1_gju_edu_jo/_layouts/15/onedrive.aspx?id=%2Fpersonal%2Fm%5Falbizreh1%5Fgju%5Fedu%5Fjo%2FDocuments%2FParallel%20Project%2Fbinr&originalPath=aHR0cHM6Ly9nanVlZHVqby1teS5zaGFyZXBvaW50LmNvbS86ZjovZy9wZXJzb25hbC9tX2FsYml6cmVoMV9nanVfZWR1X2pvL0VzaHFWNDJCVThkQ25KOFV0dm82NHJNQmdoOWdCeEZOblkwQWtRMkQ0MU5UV3c_cnRpbWU9TTl4Zi1YblAxMGc for the release version (vidd.MP4 is the video)

  Thanks in Advance

• How to compile ffmpeg-0.10.3 on windows with cygwin and android ndk r5

  19 avril 2014, par Vikram Mahal

  I want to compile ffmpeg on windows with cygwin and android ndk.
  I found this link very useful because there is step to step guide to compile ffmpeg.

  Does anyone find this useful ? - Compiling FFMPEG on Windows with Cywin and NDK r5

  But at last point when i am going to create .so file i got this error in cygwin bash.

  ---

  CONSOLE OUTPUT :

  vikram mahal@vikrammahal-PC ~
  
  $ cd /cygdrive/c/ffmpeg-0.10.3
  
  vikram mahal@vikrammahal-PC /cygdrive/c/ffmpeg-0.10.3
  
  $ dos2unix build_android.sh
  
  dos2unix: converting file build_android.sh to Unix format ...
  
  vikram mahal@vikrammahal-PC /cygdrive/c/ffmpeg-0.10.3
  
  $ ./build_android.sh
  
  )/configure: line 10: warning: setlocale: LC_ALL: cannot change locale (C
  
  ': not a valid identifierort: `LC_ALL
  
  ./configure: line 14: syntax error near unexpected token `$'{\r''
  
  '/configure: line 14: `try_exec(){
  
  ./build_android.sh: line 54: make: command not found
  
  ./build_android.sh: line 55: make: command not found
  
  C:\android-ndk-r5\toolchains\arm-linux-androideabi-4.4.3\prebuilt\windows\bin\ar
  
  m-linux-androideabi-ld.exe: cannot open output file ./android/armv7-a/libffmpeg.
  
  so: No such file or directory

• aarch64 : Add Windows runtime detection of the dotprod instructions

  26 mai 2023, par Martin Storsjö

  aarch64 : Add Windows runtime detection of the dotprod instructions
  For Windows, there's no publicly defined constant for checking for
  
  the i8mm extension yet.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavutil/aarch64/cpu.c