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• retransmit incoming vp8-rtp-udp stream as the same rtp

  9 janvier 2014, par rub

  S'cuse the title.. I find it hard even to write up the question :

  I am trying to use ffmpeg to channel an incoming realtime video stream (Android VoIP call) into a local-network PC. I have compiled FFMPEG to android using the most recent NDK/FFMPEG git sources, but I find it hard to get all the configuration right.

  Now, I understand that FFMPEG has retransmission functionality - I found a number of command line examples, similar to what I need :

  **ffmpeg -re -i udp://1.2.3.4:1234  http://127.0.0.1:8090/feed1.ffm**

  What I don't understand :

  1. Which process to use : ffmpeg / ffserver / ffplay ??
  2. Do I have to use a ffserver.conf file (IP security right ?)
  3. Can I use sdp for incoming udp channel (I have the SDP from the VoIP/SIP call)

  Thanks

• Building FFMpeg for Android NDK gives me .a instead of .so files

  22 juin 2014, par Fabien Henon

  I’m a Mac user. I followed this tutorial : http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/ to build FFMpeg for Android using NDK

  I’m using FFMpeg 2.1 and NDK r9.

  Here is my build_android.sh file in my FFMepg folder which is in my $NDK/sources folder :

  #!/bin/bash
  
  
  
  NDK=$HOME/Desktop/adt/android-ndk
  
  SYSROOT=$NDK/platforms/android-8/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --enable-shared \
  
      --disable-static \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-doc \
  
      --disable-symver \
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
      --target-os=linux \
  
      --arch=arm \
  
      --enable-cross-compile \
  
      --sysroot=$SYSROOT \
  
      --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
      --extra-ldflags="$ADDI_LDFLAGS" \
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU 
  
  ADDI_CFLAGS="-marm"
  
  build_one

  Evrything is compiling fine but at the end I get .a files whereas in the tutorial I should get .so files.

  What is wrong with what I did ? The only thing that changes is :

  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64

  which is :

  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64

  in the tutorial.

• Batch File Removing File Extension

  29 décembre 2013, par scsa20

  So I've made a batch file to help me extract the video only from an MKV file using MKVToolNix and then re-encode the h264 file to an MP4 for video editing using mp4box. It works really well, this is how it looks :

  for %%a in (*.mkv) do "C:\Program Files (x86)\MKVToolNix\mkvextract.exe" --ui-language en tracks "%%a" 0:"%Sources%\h264\%%a.h264"

  for %%a in (*.h264) do mp4box.exe -add "%%a:fps=23.976" "%Sources%\%%a.mp4"

  Problem is, the first line would extract the file with .mkv.h264 then when I go to encode the file with mp4box to a MP4 file it comes out as .mkv.h264.mp4.

  Is there a way to code it so it'll drop the first 2 extensions and leave only with the .MP4 ? Searched around and can't find my answer for something that is after the fact (all the ones I've found is for removing the last extension which doesn't help me).

  Thank you for any help.