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• libavcodec/qsvenc.c delay in 1 microsecond replaced to more appropriate 500 microseconds

  28 juillet 2015, par Ivan Uskov

  libavcodec/qsvenc.c delay in 1 microsecond replaced to more appropriate 500 microseconds
  This commit replaces the 1 microsecond delay by 500 microsecond for the
  
  case when the MFX library does return MFX_WRN_DEVICE_BUSY status.
  
  In general this warning never appears for simple encoding or
  
  transcoding session because the GPU is so fast so it almost always is not busy and
  
  any delay value just does not executes.
  
  But for heavy transcoding tasks for example, when several QSV sessions
  
  are running simultaneously then using a 1-microsecond delay may
  
  result in 1000 iterations per each frame.
  
  So here possible a paradoxical case when GPU loading also loads CPU by dummy tasks.
  
  Official MFX/QSV samples by Intel are using 1 millisecond (i.e. 1000
  
  microseconds) everywhere where MFX_WRN_DEVICE_BUSY does appear.
  
  So 500us is a much more optimal value than 1us.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/qsvenc.c

• Error Installing mobile-ffmpeg-full-gpl (4.4.LTS) via CocoaPods - 404 Not Found

  9 juillet, par Muhammad Accucia

  I am trying to install mobile-ffmpeg-full-gpl (4.4.LTS) in my iOS project using CocoaPods, but I am encountering a 404 error when CocoaPods attempts to download the framework.

  


  Here is the error message :

  


  \[!\] Error installing mobile-ffmpeg-full-gpl
\[!\] /usr/bin/curl -f -L -o /var/folders/78/lk7swzb97ml4dt3zd9grny0c0000gn/T/d20250201-6580-dtli8h/file.zip https://github.com/tanersener/mobile-ffmpeg/releases/download/v4.4.LTS/mobile-ffmpeg-full-gpl-4.4.LTS-ios-framework.zip --create-dirs --netrc-optional --retry 2 -A 'CocoaPods/1.15.2 cocoapods-downloader/2.1'

% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
Dload  Upload   Total   Spent    Left  Speed
0     9    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (56) The requested URL returned error: 404


  


  It seems like the requested file is no longer available at the specified URL.

  


  Checked the official GitHub releases page for mobile-ffmpeg-full-gpl (4.4.LTS), but I couldn't find the exact file.

  


• Anything Wrong with (char[32]){0} in Visual Studio 2012 ?

  5 juillet 2014, par loppp

  ===== background ====

  This problem originates from using fFmpeg lib sample muxing.c in visual studio 2012, I found the the error :

  error C2143: Syntax error missing ) before {

  at

  printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
  
      av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
  
      av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
  
      av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
  
      pkt->stream_index);    

  and I found

  #define AV_TS_MAX_STRING_SIZE 32
  
  #define av_ts2str(ts) av_ts_make_string((char[AV_TS_MAX_STRING_SIZE]){0}, ts)

  for eliminate irrelevant statement, I just replace the big printf with

  printf("pts:%s \n",
  
      (char[32]){0}
  
      );

  but the error still the same, looks the error is from

  (char[32]){0}

  ===== question ====

  As this sample source file muxing.c is official one (I think), might not possibly wrong, so is the statement wrong or not compatible with VS compiler ? or I am missing something here ?