Recherche avancée

Sur d’autres sites (12237)

• High quality screen capture using ffmpeg on wayland [closed]

  27 novembre 2024, par Charlie Benger-Stevenson

  Running hyprland/wayland on arch.

  


  I want a reasonable quality (for say youtube) screen capture.

  


  ffmpeg -device /dev/dri/card1 -re -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,hwdownload,format=bgr0' -s 1920x1080 -c:v mpeg2video -b:v 1M -t 5  ~/Recordings/screencap.avi


  


  This should set a bitrate of 1M but the output is super blocky with a much lower bitrate than specified by the b:v flag.

  


  What am I doing wrong ?

  


• Please provide latest version FFmpeg library(.so) file for android

  2 mai 2014, par Carlos

  i have using the following library files :

  {"ffmpeg",
  
          "libavcodec.so", "libavcodec.so.52", "libavcodec.so.52.99.1",
  
          "libavcore.so", "libavcore.so.0", "libavcore.so.0.16.0",
  
          "libavdevice.so", "libavdevice.so.52", "libavdevice.so.52.2.2",
  
          "libavfilter.so", "libavfilter.so.1", "libavfilter.so.1.69.0",
  
          "libavformat.so", "libavformat.so.52", "libavformat.so.52.88.0",
  
          "libavutil.so", "libavutil.so.50", "libavutil.so.50.34.0",
  
          "libswscale.so", "libswscale.so.0", "libswscale.so.0.12.0"
  
  };

  when i used the following commands

  String[] ffmpegCommand ={"/data/data/com.mobvcasting.mjpegffmpeg/ffmpeg","-i",Environment.getExternalStorageDirectory().getPath() + "/com.mobvcasting.mjpegffmpeg/bg.png",
  
                      "-r","5","-i",Environment.getExternalStorageDirectory().getPath() + "/com.mobvcasting.mjpegffmpeg/image%d.png","-filter_complex","overlay","-shortest",Environment.getExternalStorageDirectory().getPath() + "/com.mobvcasting.mjpegffmpeg/video.mp4"};

  i got Error Like

  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***FFmpeg version UNKNOWN, Copyright (c) 2000-2010 the FFmpeg developers***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  built on Jul 28 2011 16:47:07 with gcc 4.4.3***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  configuration: --target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm --sysroot=/Developer/android-ndk-r5b//platforms/android-3/arch-arm --soname-prefix=/data/data/com.mobvcasting.mjpegffmpeg/ --enable-shared --disable-symver --enable-small --optimization-flags=-O2 --enable-encoder=mpeg2video --enable-encoder=nellymoser --enable-protocol=file --prefix=../build/ffmpeg/armeabi --extra-cflags= --extra-ldflags=***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  libavutil     50.34. 0 / 50.34. 0***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  libavcore      0.16. 0 /  0.16. 0***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  libavcodec    52.99. 1 / 52.99. 1***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  libavformat   52.88. 0 / 52.88. 0***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  libavdevice   52. 2. 2 / 52. 2. 2***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  libavfilter    1.69. 0 /  1.69. 0***
  
  10-15 11:22:55.970: E/MJPEG_FFMPEG(2620): ***  libswscale     0.12. 0 /  0.12. 0***

  Please can anyone provide latest FFmpeg library file ?

• Compiling FFmpeg staticly using NDK error - Not position independent executable

  27 février 2017, par David Barishev

  I have been trying to compile ffmpeg into a static library in order to use it in my android application, but i couldn’t get it to work.

  Im working with FFmpeg 3.2.4, and ndk r13b, using bash on windows 10(Ubuntu 14.04).

  Here is what i did :

  • I made a stand alone toolchain for x86_64 and api 21 using :
    python make_standalone_toolchain.py --api 21 --arch x86_64 --install-dir {}

  • Made a configuration script :

    ./configure \
    
    --target-os=android                                     \
    
    --arch=x86_64                                              \
    
    --prefix=/home/david/ffmpeg_x86_64_build                          \
    
    --cross-prefix=/home/david/x86_64_toolchain/bin/x86_64-linux-android-\
    
    --sysroot=/home/david/x86_64_toolchain/sysroot                    \
    
    --enable-cross-compile                                  \
    
    --pkg-config-flags="--static"                           \
    
    --enable-ffmpeg                                         \
    
    --disable-ffplay                                        \
    
    --disable-ffprobe                                       \
    
    --disable-ffserver                                      \
    
    --disable-doc                                           \
    
    --disable-htmlpages                                     \
    
    --disable-manpages                                      \
    
    --disable-podpages                                      \
    
    --disable-txtpages                                      \
    
    --extra-cflags="-fPIC"                                  \
    
    --extra-cxxflags="-fPIC"
    
    --disable-shared --enable-static \
    
    --enable-yasm
    
    
    
    make
    
    make install

  It produced an FFmpeg executable, however when i ran it on my API 23 emulator, i got an error message :error: only position independent executables (PIE) are supported.
  Even that i used -fPic

  How can i fix it ? Also i’m not sure about my configuration, there wasn’t up to date sources on how to compile it correctly for every ABI (arm,arm64,x86,x86_64,mips,mips64) that i need for my application.
  I have seen many script, and im not too familiar with compiling native code, so i wasn’t sure what settings i need, for example like C flags and etc.

  To be precise on how i tried to configure FFmpeg :

  • I need a static library
  • I Only need the ffmpeg command line utility
  • I want to compile the library for every ABI i listed above.This configuration tried to compile for x86_64.
  • Running on android of course

  I would greatly appreciate some help on how to configure and compile this correctly.