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• ffmpeg iOS and SDL2

  24 décembre 2015, par user3487978

  I created a app for iPhone, the core source is based on the latest ffplay.c, I just changed the rendering part to support iOS, general it can play video, but I found the quality is not as good as enough, see screenshot below, the first image is the what expected, the second is image that my app on iPhone produced, and the last the produced by my app on iPad.
  on the iPhone’s image, you can found there is a dash line, and the colour is not correct, it seems that there is a shadow of the image.
  I am new to ffmpeg, can anyone help me what is the problem

• OpenShift — installing ffmpeg

  2 juillet 2016, par aweeeezy

  I’m new to deploying web apps — I just started looking into hosting plans yesterday morning when I settled on OpenShift. I have my app running, but it depends on node-youtube-dl which returns this error when trying to download a video from a link :

  Error: Command failed: WARNING: m_djk1RQ2Ew: writing DASH m4a. Only some players support this container. Install ffmpeg or avconv to fix this automatically.
  
  ERROR: ffprobe or avprobe not found. Please install one.

  So I searched around for awhile and kept returning to the same list instructions for how to install ffmpeg on OpenShift :

  cd $OPENSHIFT_DATA_DIR
  
  mkdir bin
  
  wget http://www.tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz
  
  wget http://ffmpeg.org/releases/ffmpeg-2.0.1.tar.gz
  
  
  
  tar -xvf yasm-1.2.0.tar.gz
  
  cd yasm-1.2.0
  
  ./configure --prefix=$OPENSHIFT_DATA_DIR/bin --bindir=$OPENSHIFT_DATA_DIR/bin
  
  make
  
  make install
  
  export PATH=$OPENSHIFT_DATA_DIR/bin:$PATH
  
  
  
  cd $OPENSHIFT_DATA_DIR
  
  tar -xvf ffmpeg-2.0.1.tar.gz
  
  cd ffmpeg-2.0.1
  
  ./configure --prefix=$OPENSHIFT_DATA_DIR/bin --bindir=$OPENSHIFT_DATA_DIR/bin
  
  make
  
  make install

  Now my ~/app-root/data has ffprobe in it as well as some other codec related things, but node-youtube-dl still returns the same error saying I don’t have the necessary codecs installed. Here’s a listing of the contents of my data directory on OpenShift :

  -rwxr-xr-x.  1  11024048 Jul  2 01:51 ffmpeg
  
  -rwxr-xr-x.  1  10967408 Jul  2 01:51 ffprobe
  
  -rwxr-xr-x.  1  10611184 Jul  2 01:51 ffserver
  
  drwx------. 10      4096 Jul  2 01:51 include
  
  drwx------.  3      4096 Jul  2 01:51 lib
  
  drwx------.  4        29 Jul  2 01:51 share
  
  -rwxr-xr-x.  1   2116650 Jul  2 01:15 vsyasm
  
  -rwxr-xr-x.  1   2115479 Jul  2 01:15 yasm
  
  -rwxr-xr-x.  1   2102821 Jul  2 01:15 ytasm

  I really want OpenShift to work because it’s the last step to finishing off this one app before I move onto new projects — I don’t want to switch to paid hosting that will allow me to install stuff because I won’t be ready to determine an appropriate plan until a few months from now. That leaves me with trying to get ffmpeg to compile properly on OpenShift...so either a) I’m ignorant and it has long since been determined to be impossible by the OpenShift community or b) I’m ignorant and there’s a simple thing I’m doing wrong when building my codec libraries.

  Anybody out there know what’s wrong or had success installing these codecs before ? I’d greatly appreciate some guidance !

• building a shared library using android studio ( regarding FFMPEG/Libav Fast Fourier Transform)

  1er juin 2017, par Bishop Duperret

  I’m building some software for android and I’m desperately in need of a faster FFT function than I am currently using.

  After researching I found that libav/FFMPEG have really good FFT functions tailored for the ARM architecture.

  1) What is the most straight forward way to build either libraries as a .SO ?
  (There’s so much info out there I’m overwhelmed)

  2) Since I ONLY need access to the FFT, would it be possible to simple build that c class, license permitting ? Last I checked there was some ARM code so that may complicate it.

  Any help is greatly appreciated !