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• Compiling FFmpeg staticly using NDK

  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=linux                                                    \
    
    --arch=x86                                             \
    
    --prefix=<output path="path">                                                  \
    
    --cross-prefix=<stand alone="alone" toolchain="toolchain" path="path">/bin/x86_64-linux-android-           \
    
    --sysroot=<stand alone="alone" toolchain="toolchain" path="path">/sysroot                                  \
    
    --enable-cross-compile                                               \
    
    --pkg-config-flags="--static"                                        \
    
    --enable-yasm       \
    
    --enable-ffmpeg     \
    
    --disable-ffplay    \
    
    --disable-ffprobe   \
    
    --disable-ffserver  \
    
    --disable-doc                                                          \
    
    --disable-htmlpages                                                    \
    
    --disable-manpages                                                     \
    
    --disable-podpages                                                     \
    
    --disable-txtpages                                                     \
    
    
    
    make install
    
    </stand></stand></output>

  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.

  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.

  EDIT

  I tried compiling for x86, on an Ubuntu 16.04 (x86_64) VM, using roughly the same config , and i got a different error.

  I made a standalone toolchain for x86 :
  python make_standalone_toolchain.py --arch x86 --api 19 --install-dir ~/x86_toolchain

  And made this configuration file :

  ./configure \
  
  --target-os=linux                                       \
  
  --arch=x86                                              \
  
  --prefix=~/ffmpeg_x86_build                             \
  
  --cross-prefix=~/x86_toolchain/bin/i686-linux-android-  \
  
  --sysroot=~/x86_toolchain/sysroot                       \
  
  --enable-cross-compile                                  \
  
  --pkg-config-flags="--static"                           \
  
  --enable-yasm                                           \
  
  --enable-ffmpeg                                         \
  
  --disable-ffplay                                        \
  
  --disable-ffprobe                                       \
  
  --disable-ffserver                                      \
  
  --disable-doc                                           \
  
  --disable-htmlpages                                     \
  
  --disable-manpages                                      \
  
  --disable-podpages                                      \
  
  --disable-txtpages                                      \
  
  
  
  make clean
  
  make install

  The error im getting now is :

  ~/x86_toolchain/bin/i686-linux-android-gcc is unable to create an executable file.
  
  C compiler test failed.

  In the log file, it seems like it cant access the compiler, even though he is OK (i tested it with a simple hello world).Also its not a permission problem(Everybody has read write access)

  ~/x86_toolchain/bin/i686-linux-android-gcc -fPIC -c -o /tmp/ffconf.yYKPHtht.o /tmp/ffconf.Nxskyxyb.c
  
  ./configure: 874: ./configure: ~/x86_toolchain/bin/i686-linux-android-gcc: not found
  
  C compiler test failed.

  So i’m clearly doing something wrong.Does anyone know why ? And how should i do it instead ?

• How do I configure codec parameters for a RTSP stream ?

  16 mai 2024, par Kermit

  I am trying to stream a network camera source into /dev/video0. However, all attempts keep telling me I have set incorrect codec parameters. Any suggestions ?

  


  # works
ffplay rtsp://admin:password@172.16.0.184:554/live


  


  Then trying any of these to feed into /dev/video0 (valid from list of ls /dev/video*) :

  


  ffmpeg -rtsp_transport tcp -i "rtsp://admin:password@172.16.0.184:554/live" -c:v rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0


  


  Results in

  


  ffmpeg version 5.1.4-0+rpt3+deb12u1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --extra-version=0+rpt3+deb12u1 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, rtsp, from 'rtsp://admin:password@172.16.0.184:554/live':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 3840x2160, 30 fps, 100 tbr, 90k tbn
  Stream #0:1: Audio: aac (LC), 32000 Hz, mono, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x55562d9faa70] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
Conversion failed!


  


• Layout Video Recording Like Instgram/ Ticktok Feature

  21 mars 2023, par Amarchand K

  I'm try to do record video inn different layouts like Instagram in Flutter. For this feature I used ffmpeg_kit_flutter package. I refers this solution to do this. but output video is blank, any one helps me to solve this.
the video input and output path is valid, also show the bellow error while printing,

  


  `ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
    built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
    configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-iconv --disable-sdl2 --disable-openssl --enable-zlib --enable-mediacodec
    libavutil      57. 28.100 / 57. 28.100
    libavcodec     59. 37.100 / 59. 37.100
    libavformat    59. 27.100 / 59. 27.100
    libavdevice    59.  7.100 / 59.  7.100
    libavfilter     8. 44.100 /  8. 44.100
    libswscale      6.  7.100 /  6.  7.100
    libswresample   4.  7.100 /  4.  7.100
  -vsync is deprecated. Use -fps_mode
  Passing a number to -vsync is deprecated, use a string argument as described in the manual.
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.example.tuki_taki/cache/REC1453994379216336834.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-03-21T07:15:58.000000Z
      com.android.version: 12
    Duration: 00:00:03.77, start: 0.000000, bitrate: 2204 kb/s
    Stream #0:0[0x1](eng): Video: h264, 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg/smpte170m/bt709, progressive, left), 640x480, 2199 kb/s, 29.61 fps, 29.58 tbr, 90k tbn (default)
      Metadata:
        creation_time   : 2023-03-21T07:15:58.000000Z
        handler_name    : VideoHandle
        vendor_id       : [0][0][0][0]
      Side data:
        displaymatrix: rotation of -90.00 degrees
    Stream #0:1[0x2](eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 128 kb/s (default)
      Metadata:
        creation_time   : 2023-03-21T07:15:58.000000Z
        handler_name    : SoundHandle
        vendor_id       : [0][0][0][0]
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.example.tuki_taki/cache/REC5972384708251368209.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-03-21T07:16:05.000000Z
      com.android.version: 12
    Duration: 00:00:02.84, start: 0.000000, bitrate: 2703 kb/s
    Stream #1:0[0x1](eng): Video: h264, 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg/smpte170m/bt709, progressive, left), 640x480, 2801 kb/s, 29.61 fps, 29.58 tbr, 90k tbn (default)
      Metadata:
        creation_time   : 2023-03-21T07:16:05.000000Z
        handler_name    : VideoHandle
        vendor_id       : [0][0][0][0]
      Side data:
        displaymatrix: rotation of -90.00 degrees
    Stream #1:1[0x2](eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 128 kb/s (default)
      Metadata:
        creation_time   : 2023-03-21T07:16:05.000000Z
        handler_name    : SoundHandle
        vendor_id       : [0][0][0][0]
  Stream mapping:
    Stream #0:0 (h264) -> scale:default
    Stream #0:1 (aac) -> amix
    Stream #1:0 (h264) -> scale:default
    Stream #1:1 (aac) -> amix
    hstack:default -> Stream #0:0 (mpeg4)
    amix:default -> Stream #0:1 (aac)
  Press [q] to stop, [?] for help
  Output #0, mp4, to '/data/user/0/com.example.tuki_taki/cache/output.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      com.android.version: 12
      encoder         : Lavf59.27.100
    Stream #0:0: Video: mpeg4, 1 reference frame (mp4v / 0x7634706D), yuv420p(progressive), 960x640 (0x0) [SAR 1:1 DAR 3:2], q=2-31, 200 kb/s, 29.58 fps, 11360 tbn
      Metadata:
        encoder         : Lavc59.37.100 mpeg4
      Side data:
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, delay 1024, 69 kb/s
      Metadata:
        encoder         : Lavc59.37.100 aac
  frame=    1 fps=0.0 q=4.3 size=       0kB time=00:00:00.23 bitrate=   1.5kbits/s speed=3.49x    


  


  [mpeg4 @ 0xb400007122ebac50] Invalid pts (8) <= last (8)&#xA;Error submitting video frame to the encoder&#xA;[aac @ 0xb4000071232208c0] Qavg : 9911.349&#xA;[aac @ 0xb4000071232208c0] 2 frames left in the queue on closing&#xA;Conversion failed`

  &#xA;

  I'm tried

  &#xA;

    `Future<void> onLayoutDone() async {&#xA;try {&#xA;  final String outputPath = await _getTempPath();   &#xA;  const String filter =&#xA;      "[0:v]scale=480:640,setsar=1[l];[1:v]scale=480:640,setsar=1[r];[l][r]hstack;[0][1]amix -vsync 0 ";    &#xA;  log("left path: ${layoutVideoPathList[0]} right : ${layoutVideoPathList[1]} $outputPath");     &#xA;  final String command =" -y -i ${layoutVideoPathList[0]} -i ${layoutVideoPathList[1]} -filter_complex$filter$outputPath -loglevel verbose"; `these paths are valid`    &#xA;     &#xA;  await FFmpegKit.execute(command).then((value) async {      &#xA;    String? error = await value.getAllLogsAsString();    &#xA;    log(error!);    &#xA;    final ReturnCode? returnCode = await value.getReturnCode();    &#xA;    if (returnCode != null) {&#xA;      setVideo(videoPath: outputPath);    &#xA;      layoutVideoPathList.clear();    &#xA;    }&#xA;  });&#xA;} catch (e) {&#xA;  log("error while  combine -========-=-=-=-=-=-=-=-=- $e");    &#xA;}`&#xA;</void>

  &#xA;