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• ffmpeg on Intel Edison cannot find pkg-config

  4 février 2016, par Joel Gallant

  I’ve had a surprisingly difficult time finding documentation for what I’m seeing. I’m cross-compiling ffmpeg for the Intel Edison using the poky linux sdk. I’ve set up an upper level makefile to do the following :

  ffmpeg_DIR=$(shell realpath libs/ffmpeg)
  
  EdisonSDK_DIR=/opt/poky-edison/1.7.2
  
  EdisonSysroot=$(EdisonSDK_DIR)/sysroots/core2-32-poky-linux
  
  PATH:=$(EdisonSysroot)/usr/bin/:$(EdisonSysroot)/usr/bin/i586-poky-linux:$(PATH)
  
  
  
  ffmpeg-config: FORCE
  
      mkdir -p $(ffmpeg_DIR)/build; \
  
      cd $(ffmpeg_DIR); \
  
      PATH=$(PATH) ./configure \
  
          --prefix=$(ffmpeg_DIR)/build \
  
          --enable-shared \
  
          --disable-static \
  
          --disable-doc \
  
          --arch=i686 \
  
          --enable-cross-compile \
  
          --cross-prefix=i586-poky-linux- \
  
          --sysinclude=$(EdisonSysroot)/include \
  
          --pkg-config=$(EdisonSysroot)/usr/bin/pkg-config \
  
          --target-os=linux
  
  
  
  ifeq (,$(wildcard $(ffmpeg_DIR)/build))
  
  ffmpeg: ffmpeg-config FORCE
  
  else
  
  ffmpeg: FORCE
  
  endif
  
      +make -C$(ffmpeg_DIR)

  So as far as I understand it, it’s using the PATH correctly, sysroot is being inserted in cc and ld calls, and sysinclude is working.

  I’m seeing this in the output of the main makefile :

  tput: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory

  And seeing this in the config.log

  i586-poky-linux-gcc -O2 -pipe -g -feliminate-unused-debug-types -c -o /tmp/ffconf.T3Y8Tm6G.o /tmp/ffconf.t8bOuCO2.c
  
  /opt/poky-edison/1.7.2/sysroots/core2-32-poky-linux/usr/bin/../lib/gcc/gcc/i586-poky-linux/4.9.1/cc1: error while loading shared libraries: libmpc.so.3: cannot open shared object file: No such file or directory
  
  /opt/poky-edison/1.7.2/sysroots/core2-32-poky-linux/usr/bin/../lib/gcc/i586-poky-linux/4.9.1/../../../../i586-poky-linux/bin/as: error while loading shared libraries: libopcodes-2.24.so: cannot open shared object file: No such file or directory
  
  C compiler test failed.

  So to me, that seems like a linker error. And in the config.log, I also see that pkg-config isn’t working.

  WARNING: /opt/poky-edison/1.7.2/sysroots/core2-32-poky-linux/usr/bin/pkg-config not found, library detection may fail.

  So I’m not sure what I’m doing wrong exactly. I’ve tried seeing sysroot or not, and not specifying the pkg-config.

  https://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/126683.html

  This seems related but is fixed now. So not sure.

• Capture Windows screen with ffmpeg

  26 juin 2015, par kamae

  The ffmpeg is cross-platform and very powerful software to handle video/audio or to stream it.
  On Linux ffmpeg can capture X11 screen with a command below :

  ffmpeg -f x11grab -r 25 -s cif -i :0.0 out.mpeg

  But is it possible to grab Windows Desktop with ffmpeg ?

• SharedArrayBuffer is not defined & SyntheticBaseEvent

  3 juin 2024, par Dain Park

  thank you for your help with my problem.

  


  I am using FFmpeg.wasm on Next.js to compress videos when users upload them. I then send the videos to a server and save them on AWS S3. For the client side, I'm using Next.js.

  


  To solve the error "SharedArrayBuffer is not defined", I added the following code to next.config.mjs :

  


  /** @type {import('next').NextConfig} */
const nextConfig = {
    reactStrictMode: false,
    async headers() {
      return [
        {
          source: '/(.*)',
          headers: [
            {
              key: 'Cross-Origin-Opener-Policy',
              value: 'same-origin',
            },
            {
              key: 'Cross-Origin-Embedder-Policy',
              value: 'require-corp',
            },
          ],
        },
      ];
    },
};
export default nextConfig;


  


  Here is the code I'm using for video compression :

  


  import { createFFmpeg, fetchFile } from &#x27;@ffmpeg/ffmpeg&#x27;;&#xA;const ffmpeg = createFFmpeg({ log: true });&#xA;&#xA;export const compressVideo = async (file: File): Promise<blob> => {&#xA;  if (!ffmpeg.isLoaded()) {&#xA;    await ffmpeg.load();&#xA;  }&#xA;&#xA;  // Write the file to FFmpeg&#x27;s filesystem&#xA;  ffmpeg.FS(&#x27;writeFile&#x27;, &#x27;input.mp4&#x27;, await fetchFile(file));&#xA;&#xA;  // Run the ffmpeg command to compress the video&#xA;  await ffmpeg.run(&#x27;-i&#x27;, &#x27;input.mp4&#x27;, &#x27;-vf&#x27;, &#x27;scale=1280:720&#x27;, &#x27;-b:v&#x27;, &#x27;1M&#x27;, &#x27;-c:v&#x27;, &#x27;libx264&#x27;, &#x27;-preset&#x27;, &#x27;fast&#x27;, &#x27;-crf&#x27;, &#x27;28&#x27;, &#x27;output.mp4&#x27;);&#xA;&#xA;  // Read the output file from FFmpeg&#x27;s filesystem&#xA;  const data = ffmpeg.FS(&#x27;readFile&#x27;, &#x27;output.mp4&#x27;);&#xA;&#xA;  // Convert the output to a Blob&#xA;  const compressedVideo = new Blob([data.buffer], { type: &#x27;video/mp4&#x27; });&#xA;&#xA;  return compressedVideo;&#xA;};&#xA;&#xA;</blob>

  


  This works well, but after that, I got this error : SyntheticBaseEvent on the video tag.

  


  Can anyone help me resolve this issue ?