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• Configured Half-ninja android FFMPEG project

  24 décembre 2013, par Mr.G

  I have configured android-halfninja project completely and i manage to build

  refered to this link

  libs/armeabi/libvideokit.so and
  libs/armeabi/ffmpeg

  libs from the given source

  But i had to make some changes to the .sh files in order to build .so files.

  But now i tried to execute following ffmpeg command in my android project it doesn't run properly

      String var[] = {"ffmpeg","-i",input};
  
  
  
  
  
  
  
  12-24 10:34:44.569: I/VideoKit(14374): Loading native library compiled at 14:43:51 Dec 18 2013
  
  12-24 10:34:44.599: I/ActivityManager(290): Process uk.co.halfninja.videokit (pid 14374) has died.
  
  12-24 10:34:44.599: W/ActivityManager(290): Force removing ActivityRecord{2bea3e28 uk.co.halfninja.videokit/.MainActivity}: app died, no saved state

  Can any one tell me what might be th issue to have this error in half-nonja project

  here is my configure_ffmpeg.sh file

      #!/bin/bash
  
  pushd `dirname $0`
  
  . settings.sh
  
  
  
  if [[ $DEBUG == 1 ]]; then
  
    echo "DEBUG = 1"
  
    DEBUG_FLAG="--disable-stripping"
  
  fi
  
  
  
  # I haven't found a reliable way to install/uninstall a patch from a Makefile,
  
  # so just always try to apply it, and ignore it if it fails. Works fine unless
  
  # the files being patched have changed, in which cause a partial application
  
  # could happen unnoticed.
  
  patch -N -p1 --reject-file=- < redact-plugins.patch
  
  patch -N -p1 --reject-file=- < arm-asm-fix.patch
  
  patch -d ffmpeg -N -p1 --reject-file=- < \
  
      ARM_generate_position_independent_code_to_access_data_symbols.patch
  
  patch -d ffmpeg -N -p1 --reject-file=- < \
  
      ARM_intmath_use_native-size_return_types_for_clipping_functions.patch
  
  patch -d ffmpeg -N -p1 --reject-file=- < \
  
      enable-fake-pkg-config.patch
  
  
  
  pushd ffmpeg
  
  
  
  ./configure \
  
  $DEBUG_FLAG \
  
  --arch=arm \
  
  --cpu=cortex-a8 \
  
  --target-os=linux \
  
  --enable-runtime-cpudetect \
  
  --prefix=$prefix \
  
  --enable-pic \
  
  --disable-shared \
  
  --enable-static \
  
  --cross-prefix=$NDK_TOOLCHAIN_BASE/bin/$NDK_ABI-linux-androideabi- \
  
  --sysroot="$NDK_SYSROOT" \
  
  --extra-cflags="-I../x264 -mfloat-abi=softfp -mfpu=neon" \
  
  --extra-ldflags="-L../x264" \
  
  \
  
  --enable-version3 \
  
  --enable-gpl \
  
  \
  
  --disable-doc \
  
  --enable-yasm \
  
  \
  
  --disable-everything \
  
  --enable-decoder=mjpeg \
  
  --enable-demuxer=mjpeg \
  
  --enable-parser=mjpeg \
  
  --enable-demuxer=image2 \
  
  --enable-muxer=mp4 \
  
  --enable-encoder=libx264 \
  
  --enable-decoder=rawvideo \
  
  --enable-protocol=file \
  
  --enable-hwaccels \
  
  --enable-filter=buffer \
  
  --enable-filter=buffersink \
  
  --disable-demuxer=v4l \
  
  --disable-demuxer=v4l2 \
  
  --disable-indev=v4l \
  
  --disable-indev=v4l2 \
  
  \
  
  --disable-indevs \
  
  --enable-indev=lavfi \
  
  --disable-outdevs \
  
  \
  
  --enable-hwaccels \
  
  \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-network \
  
  \
  
  --enable-libx264 \
  
  --enable-zlib \
  
  --enable-muxer=md5
  
  
  
  popd; popd
  
  
  
  
  
  #--enable-decoders \
  
  #--enable-encoders \
  
  #--enable-muxers \
  
  #--enable-demuxers \
  
  #--enable-parsers \
  
  #--enable-protocols \
  
  #--enable-filter=buffer \
  
  #--enable-filter=buffersink \
  
  #--enable-avresample \
  
  #--enable-faac \

• WebRTC books – a brief review

  30 décembre 2013, par silvia

  I just finished reading Rob Manson’s awesome book “Getting Started with WebRTC” and I can highly recommend it for any Web developer who is interested in WebRTC.

  Rob explains very clearly how to create your first video, audio or data peer-connection using WebRTC in current Google Chrome or Firefox (I think it also now applies to Opera, though that wasn’t the case when his book was published). He makes available example code, so you can replicate it in your own Web application easily, including the setup of a signalling server. He also points out that you need a ICE (STUN/TURN) server to punch through firewalls and gives recommendations for what software is available, but stops short of explaining how to set them up.

  Rob’s focus is very much on the features required in a typical Web application :

  • video calls
  • audio calls
  • text chats
  • file sharing

  In fact, he provides the most in-depth demo of how to set up a good file sharing interface I have come across.

  Rob then also extends his introduction to WebRTC to two key application areas : education and team communication. His recommendations are spot on and required reading for anyone developing applications in these spaces.

  —

  Before Rob’s book, I have also read Alan Johnson and Dan Burnett’s “WebRTC” book on APIs and RTCWEB protocols of the HTML5 Real-Time Web.

  Alan and Dan’s book was written more than a year ago and explains that state of standardisation at that time. It’s probably a little out-dated now, but it still gives you good foundations on why some decisions were made the way they are and what are contentious issues (some of which still remain). If you really want to understand what happens behind the scenes when you call certain functions in the WebRTC APIs of browsers, then this is for you.

  Alan and Dan’s book explains in more details than Rob’s book how IP addresses of communication partners are found, how firewall holepunching works, how sessions get negotiated, and how the standards process works. It’s probably less useful to a Web developer who just wants to implement video call functionality into their Web application, though if something goes wrong you may find yourself digging into the details of SDP, SRTP, DTLS, and other cryptic abbreviations of protocols that all need to work together to get a WebRTC call working.

  —

  Overall, both books are worthwhile and cover different aspects of WebRTC that you will stumble across if you are directly dealing with WebRTC code.

• Download m3u8 playlist and merge into one C#

  10 août 2014, par trinvh

  Solution 1 :

  I tried this by using create a ffmpeg wrapper, read output from cmd with following command :

  -i \"{m3u8-url-for-download}\" -y -c copy -bsf:a aac_adtstoasc \"{destination-filename}\"

  I can get duration, current state for downloading. Everything seems be ok. However sometimes it crashed and I can’t detect why. It isn’t ALWAYS, but SOMETIME.

  Solution 2 :

  I download m3u8 playlist file and get contents within it. It contains an array *.ts file url that I can easily download by using HttpClient. But I don’t know how to combine these *.ts file into one mp4 file that keeps their format.

  Are there other solutions for doing this ?