Sur d’autres sites (10351)

• How to resolve "ERROR : libx264 not found" ?

  13 janvier 2022, par davidvarghese

  I needed to install ffmpeg with libx264 support for enabling H.264 encoding . I installed libx264 successfully using the below script with toolchains available in android-ndk-r9d .

  



   #!/bin/bash
 NDK=~/android-ndk-r9d
 SYSROOT=$NDK/platforms/android-8/arch-arm/
 TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64
 function build_one
 {
 ./configure \
 --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
 --sysroot="$SYSROOT" \
 --host=arm-linux \
 --enable-pic \
 --enable-shared \
 --disable-cli
 make clean
 make
 make install
 }
 build_one 


  



  Now I wanted to build ffmpeg with libx264 support . I used the below script with —enable-libx264 , —enable-nonfree , —enable-gpl options as in the below script .

  



  #!/bin/bash
NDK=~/android-ndk-r9d
SYSROOT=$NDK/platforms/android-8/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64
function build_one
{
./configure \
--prefix=$PREFIX \
--enable-shared \
--enable-nonfree \
--enable-gpl \
--enable-libx264 \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-avdevice \
--disable-doc \
--disable-symver \
--cross-prefix=$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


  



  But when I run the script I'm getting error "ERROR : libx264 not found" .

  



  I suppose ffmpeg is not able to figure out the installed location of libx264 . After libx264 installation I have libx264.so file in /usr/local/lib executable at /usr/local/bin and header files at /usr/local/include directories .

  



  What all changes do I need to make to the ffmpeg build script in-order to make it detect libx264 ?

  



  Note : I am using Ubuntu 12.04(64 bit) for cross compiling .

  


• How to Build FFMPEG for android using ndk r10 on linux 32 bit system with ffmpeg 2.3.1

  5 août 2014, par sanidhya kumar

  I followed roman10 instructions and this is my build_android.sh file. I am not able to generate android libraries. Kindly help.

   !/bin/bash

  NDK=$HOME/ndk10

  SYSROOT=$NDK/platforms/android-9/arch-arm/

  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86

  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=$TOOLCHAIN/sysroot \
  
  
  
  --disable-yasm \
  
  
  
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  
  
  $ADDITIONAL_CONFIGURE_FLAG

  make clean

  make

  make install

  CPU=arm

  PREFIX=$(pwd)/android/$CPU

  ADDI_CFLAGS="-marm"

  build_one

• ffmpeg : Infinite amount of filters/crossfading dynamic playlist

  30 juillet 2019, par MaPePeR

  I want to use ffmpeg to play a dynamic playlist infinitely. The idea is, that an external command/script is executed to request the path to the next file (using the predicted start-time of the file as an argument) and continue playing files infinitely.

  From the answer to "Using FFMPEG to stream continuously videos files to a RTMP server" i learned, that i need to write a custom demuxer, that is similar to the concat demuxer. The problem arises from the fact, that i want to crossfade between the audio files and from my understanding of the demuxer i would have to implement that functionality into the demuxer itself to be able to do it, because a demuxer can only produce one (or a finite number) audio output stream and you need two to use the acrossfade-filter.

  So i would have to set up the filter graph like this :

  file1 --------------------------------*-->| cross | ---->more filters ---> Output
  
  file2 -----------------*-->| cross |----->| fade  |
  
  file3 --*-->| cross |----->| fade  |
  
        ... ->| fade  |

  Using an infinite number of crossfade-filters.

  Also i would really like to pre-filter(*, e.g. silenceremove) the audio files before cross-fading, which makes it even more complicated and the "implement everything in the demuxer"-approach even worse.

  My current solution would be to implement a custom demuxer that alternates between two output streams and does the prefiltering internally as well as an input-alternating crossfade filter like this :

  files -> | alternating |----->| alternating | ----> more filters--->
  
           |   demuxer*  |----->|  crossfade  |

  The problem i see with this approach is that i would need to send multiple EOF-terminated files from the demuxer to the crossfade-filter and i don’t know if that is even possible/allowed when using the standard ffmpeg functions like ff_request_frame.

  Can you tell me if this approach is feasible or do you have a better solution to this problem or any idea that would make this easier ?