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• FFmpeg AVFrame to OpenGL texture without YUV to RGB soft conversion

  15 novembre 2018, par zebeurton

  I want to decode an encrypted H264 video file on iOS. I already have ported our decryption algorithm and it is working fine. However, we cannot directly use H264 hardware decoder due to lack of API in SDK.

  So I am trying to find an alternative to decode H264 video. I am trying to use FFmpeg to decode these video even if there are some possible LGPL license issues. I decode H264 video without any problems and I render H264 frames thanks to OpenGL ES texture. But there are some performance issues. I instrumented my code and the bottleneck is the ffmpeg rescaling and YUV to RGB conversion.
  I know that I can use OpenGL ES 2.0 shaders to convert YUV to RGB with GPU acceleration (related post Alternative to ffmpeg for iOS).
  I also know how AVFrame structure is composed : data[0] for Y data, data[1] for U data and data[1] for V data. But I do not understand how can I use line size[x] with data[x] to transmit data to OpenGL texture.

  Does anybody have an example of AVFrame YUV to OpenGL texture ?

  Thanks,
  David

• Trouble compiling x264 on a mac OS X

  26 juin 2013, par Bernt Habermeier

  I'm having trouble compiling x264 (http://www.videolan.org/developers/x264.html) on a Mac with the command line tools from XCode. The following steps don't work :

  git clone git://git.videolan.org/x264.git
  
  cd x264
  
  ./configure
  
  make

  That ends up giving you the following error :

  gcc -Wshadow -O3 -ffast-math -m64  -Wall -I. -I. -falign-loops=16 -mdynamic-no-pic -arch x86_64 -std=gnu99 -mpreferred-stack-boundary=5  -I/usr/local/include    -I/usr/local/include   -fomit-frame-pointer -fno-tree-vectorize   -c -o x264.o x264.c
  
  In file included from ./extras/cl.h:27,
  
                   from common/opencl.h:31,
  
                   from common/common.h:209,
  
                   from x264.c:33:
  
  ./extras/cl_platform.h:64:10: warning: #warning This path should never happen outside of internal operating system development. AvailabilityMacros do not function correctly here!
  
  In file included from common/opencl.h:31,
  
                   from common/common.h:209,
  
                   from x264.c:33:
  
  ./extras/cl.h:1165: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘cl_mem’
  
  ./extras/cl.h:1175: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘cl_mem’
  
  ./extras/cl.h:1187: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘cl_int’
  
  ./extras/cl.h:1191: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘cl_int’
  
  ./extras/cl.h:1196: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘cl_int’
  
  ./extras/cl.h:1199: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘cl_int’
  
  ./extras/cl.h:1202: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
  
  make: *** [x264.o] Error 1

  How do you compile x264 for Mac OS X with the latest XCode Command Line tools ?

• javacv FFmpegFrameGrabber.start() blocked,not run next line

  23 août 2017, par L.U

  when i run grabber.start it blocked,not run next line.

  FFmpegFrameGrabber grabber = new  FFmpegFrameGrabber("rtsp://admin:123456@192.168.3.2:10554/tcp/av0_0");
  
  grabber.start();
  
  final AtomicBoolean interruptFlag = new AtomicBoolean(false);

  get console message :

  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.

  how to resole it ?thanks