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• Compiling ffmpeg for chromium on Windows

  7 janvier 2019, par ykhandel

  I am following the instructions here to generate the gn files for Chromium. I have installed the cygwin base package along with diffutils, nasm, make and python.

  Also, I have copied chromium/scripts/cygwin-wrapper to /usr/local/bin

  1. Started C :\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\Tools\VsDevCmd.bat

  2. Started C :\cygwin\cygwin.bat

  3. cd to third_party\chromium\scripts

  4. python build_ffmpeg win ia32

  I am getting some warnings plus this :

  Could not create temporary library.
  make : *** [/cygdrive/d/src/chromium/src/third_party/ffmpeg/ffbuild/library.mak:102 : libavutil/avutil-56.dll] Error 1

  make : *** Waiting for unfinished jobs....

  Could not create temporary library.

  Could not create temporary library.

  make : *** [/cygdrive/d/src/chromium/src/third_party/ffmpeg/ffbuild/library.mak:102 : libavcodec/avcodec-58.dll] Error 1

  make : *** [/cygdrive/d/src/chromium/src/third_party/ffmpeg/ffbuild/library.mak:102 : libavformat/avformat-58.dll] Error 1

  Traceback (most recent call last) :

  File "build_ffmpeg.py", line 900, in

  sys.exit(main(sys.argv[1 :]))

  File "build_ffmpeg.py", line 502, in main

  options=options)

  File "build_ffmpeg.py", line 876, in ConfigureAndBuild

  configure_args)

  File "build_ffmpeg.py", line 870, in do_build_ffmpeg

  options.config_only, branding, configure_flags)

  File "build_ffmpeg.py", line 408, in BuildFFmpeg

  [’make’, ’-j%d’ % parallel_jobs] + libraries, cwd=config_dir)

  File "build_ffmpeg.py", line 106, in PrintAndCheckCall

  subprocess.check_call(argv, *args, **kwargs)

  File "/usr/lib/python2.7/subprocess.py", line 186, in check_call

  raise CalledProcessError(retcode, cmd)

  subprocess.CalledProcessError : Command ’[’make’, ’-j8’, ’libavcodec/avcodec-
  58.dll’, ’libavformat/avformat-58.dll’, ’libavutil/avutil-56.dll’]’ returned non-zero exit status 2

• Error installing Opencv (any version) : relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object

  11 juin 2015, par Anshul

  I’m running Ubuntu 14.04 and want to install a library iai_kinect2 and it requires OpenCV to be installed. I’ve been trying to install Opencv for a day and a half now but no matter what version I try to install (after installing ffmeg correctly, after adding the —enable-pic option to the ./configure), it still gives me the same error as given above. Although I’m fairly new to Linux, I understood from what I read that this is a 32 vs 64 bit issue (i.e. some dependencies are not working correctly for the 64 bit Ubuntu that I have.

  Most forums I saw said the problem was with ffmpeg not installing correctly. I followed the instructions here and although I did not find gstreamer1.0-ffmpeg, I read that gstreamer-1.0-libav works and I installed that successfully. Also, after running cmake for opencv, it says it found ffmeg. So I don’t know how to go further to solve this issue. Any suggestions would be welcome. Thanks.

  The error I receive while running make for opencv is :

      .
  
      .
  
      [ 38%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o
  
      Linking CXX shared library ../../lib/libopencv_videoio.so
  
      /usr/bin/ld: /usr/local/lib/libavcodec.a(avpacket.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
  
      /usr/local/lib/libavcodec.a: error adding symbols: Bad value
  
      collect2: error: ld returned 1 exit status
  
      make[2]: *** [lib/libopencv_videoio.so.3.0.0] Error 1
  
      make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
  
      make[1]: *** Waiting for unfinished jobs....
  
      [ 38%] Building CXX object modules/shape/CMakeFiles/opencv_shape.dir/src/haus_dis.cpp.o
  
      [ 38%] Building CXX object modules/shape/CMakeFiles/opencv_shape.dir/src/aff_trans.cpp.o
  
      Linking CXX shared library ../../lib/libopencv_shape.so
  
      [ 38%] Built target opencv_shape
  
      make: *** [all] Error 2

• electron fluent-ffmpeg mergeToFile() command promise not triggering

  12 septembre 2020, par Martin

  I am trying to use fluent-ffmpeg with my electron app to concatenate multiple audio files together with an image in a video. So if i have three files :

  


  song1.mp3 1:00
song2.mp3 0:30
song3.mp3 2:00
front.jpg

  


  I could create output.mp4 which would be 3:30 seconds long, and play each file one after the other in order. With front.jpg set as the background image.

  


  I am trying to create the concatenated audio file first for this video, then I can just render a vid with two inputs ; image and the 3:30second long concatenated audio file. But I'm having difficulty getting my electron app to wait for the ffmpeg job to run and complete.

  


  I know how to do all of these ffmpeg jobs on the command-line, but I've been following this guide for how to package ffmpeg into an electron app that can run on mac/win10/linux environments. I'm developing it on win10 right now.
gur.com/LtykP.png

  


  I have a button :
<button>FULLALBUM</button>

  


  that when I click runs the fullAlbum() function that calls combineMp3FilesOrig to run the actual ffmpeg job :

  


  async function fullAlbum(uploadName) {
    //document.getElementById("buttonId").disabled = true;

    //get table
    var table = $(`#upload_${uploadNumber}_table`).DataTable()
    //get all selected rows
    var selectedRows = table.rows( '.selected' ).data()
    //get outputFile location
    var path = require('path');
    var outputDir = path.dirname(selectedRows[0].audioFilepath)
    //create outputfile
    var timestamp = new Date().getUTCMilliseconds();
    let outputFilepath = `${outputDir}/output-${timestamp}.mp3` 

    
    console.log('fullAlbum() button pressed: ', timestamp)

    await combineMp3FilesOrig(selectedRows, outputFilepath, '320k', timestamp);
    //document.getElementById("buttonId").disabled = false;

    console.log(`fullAlbum() /output-${timestamp}.mp3 should be created now`)
}

function combineMp3FilesOrig(selectedRows, outputFilepath, bitrate, timestamp) {
    console.log(`combineMp3FilesOrig(): ${outputFilepath}`)
    
    //begin get ffmpeg info
    const ffmpeg = require('fluent-ffmpeg');
    //Get the paths to the packaged versions of the binaries we want to use
    const ffmpegPath = require('ffmpeg-static').replace('app.asar','app.asar.unpacked');
    const ffprobePath = require('ffprobe-static').path.replace('app.asar','app.asar.unpacked');
    //tell the ffmpeg package where it can find the needed binaries.
    ffmpeg.setFfmpegPath(ffmpegPath);
    ffmpeg.setFfprobePath(ffprobePath);
    //end set ffmpeg info

    //create ffmpeg command
    console.log(`combineMp3FilesOrig(): create command`)
    const command = ffmpeg();
    //set command inputs
    command.input('C:\\Users\\marti\\Documents\\martinradio\\uploads\\CharlyBoyUTurn\\5. Akula (Club Mix).flac')
    command.input('C:\\Users\\marti\\Documents\\martinradio\\uploads\\CharlyBoyUTurn\\4. Civilian Barracks.flac')

    return new Promise((resolve, reject) => {
        console.log(`combineMp3FilesOrig(): command status logging`)
        command.on('progress', function(progress) {
            console.info(`Processing : ${progress.percent} % done`);
        })
        .on('codecData', function(data) {
            console.log('codecData=',data);
        })
        .on('end', function() {
            console.log('file has been converted succesfully; resolve() promise');
            resolve();
        })
        .on('error', function(err) {
            console.log('an error happened: ' + err.message, ', reject()');
            reject(err);
        })
        console.log(`combineMp3FilesOrig(): add audio bitrate to command`)
        command.audioBitrate(bitrate)
        console.log(`combineMp3FilesOrig(): tell command to merge inputs to single file`)
        command.mergeToFile(outputFilepath);
        console.log(`combineMp3FilesOrig(): end of promise`)
    });
    console.log(`combineMp3FilesOrig(): end of function`)
}


  


  When I click my button once, my console.logs show the promise is entered, the command is created, but the function just ends without waiting for a resolve() ;
Waiting a couple minutes doesnt change anything.

  


  

  


  If I press the button again :

  


  

  


  A new command gets created, reaches the end of the promise, but this time actually starts, and triggers the previous command to start. Both jobs then run and their files are rendered at the correct length (12:08) and the correct quality (320k)

  


  Is there something with my promise I need to fix involving async functions and promises in an electron app ? I tried editing my ffmpeg command to include

  


  command.run()

  


  At the end of my promise to ensure it gets triggered ; but that leads to an err in console saying Uncaught (in promise) Error: No output specified because apparently in fluent-ffmpeg command.mergeToFile(outputFilepath); isnt good enough and I need to include .output(outputFilepath) as well. If I change command.run() to command.output(outputFilepath).run(), when i click my button, the ffmpeg job gets triggered and rendered perfectly fine. EXCEPT THAT THE FILE IS ALWAYS 128kbps

  


  So I'm trying to figure out why my included code block, my ffmpeg command doesn't run the first time when its created.