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• electron ffmpeg mas build "Illegal instruction : 4"

  8 mars 2021, par Martin

  I am trying to release an electron app on the Mac Apple Store (mas), my electron app uses ffmpeg to render videos. In order to release my app on the mac apple store, It needs to be sandboxed, and by default ffmpeg makes calls to external libraries so I need to statically build ffmpeg and package it with my app. My code is on the 'mas-ffmpeg-fix' branch : https://github.com/MartinBarker/digify/tree/mas-ffmpeg-fix

  


  My static ffmpeg build works before I build my app, but after running electron-builder build --mac, the ffmpeg executable now fails with Illegal instruction: 4

  


  This is the full timeline of building/packaging/submitting my app to the mac apple store and where the error first appears :

  


  


  • In Digify repo :

    


  


  • clone, configure, and build static ffpmeg : “sudo rm -rf ffmpeg-mac/ && npm run download-ffmpeg”

    


  


  • download-ffmpeg command is inside package.json and runs this :
git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg-mac && cd ffmpeg-mac && ./configure pkg_config='pkg-config --static' --pkg-config-flags='--static' --libdir=/usr/local/lib --extra-version=ntd_20150128 --disable-shared --disable-lzma --enable-gpl --enable-pthreads --enable-nonfree --enable-libass --enable-libfdk-aac  --enable-libmp3lame  --enable-libx264 --enable-static --enable-filters --enable-runtime-cpudetect && make && cd ..

    


  


  • Check if any dylibb files in the static ffmpeg build with command : “otool -L ffmpeg-mac/ffmpeg | grep /usr/local”

    


  


  • If there are any, move them to folder in desktop, run ‘otool’ again to ensure there are no dynamic libraries, rebuild static ffmpeg.

    


  


  • there will now be a folder 'ffmpeg-mac' which contains static versions of ffmpeg and ffprobe

    


  


  


  Using ffmpeg with electron UI : works
Using Ffmpeg with command-line command :
/Users/martinbarker/Documents/projects/digify-new/ffmpeg-mac/ffmpeg -h
Works

  


  

  • Build mac mass app with “npm run build-mas“

  


  • When this command finishes it will output two files inside the /dist/mas/ folder : Digify.app and Digify-01.20.pkg (or whatever version number it is)
Ffmpeg command-line check :
/Users/martinbarker/Documents/projects/digify-new/dist/mas/Digify.app/Contents/Resources/ffmpeg -h
Illegal instruction : 4

  


  


  This is the first place the error appears, after building my mac mac-apple-store app, ffmpeg fails with this err.

  


  

  • Sign built app with .sh file : “sh mas-sign-script.sh”
view .sh file here

    

    • the .sh file will output Digify-mac.pkg

    


    


  


  • Easier command to both build & sign : “sudo rm -rf dist/mas/ && npm run build-mas && sh mas-sign-script.sh”

  


  • Upload the outputted “Digify-mac.pkg” file & submit to apple for review

  


  


  Once this app gets published in the store, if you download it and try to run an ffmpeg command with the electron UI, it fails with this error :

  


  /Applications/Digify.app/Contents/Resources/app.asar/node_modules/execa/lib/error.js:59 Uncaught (in promise) Error: Command failed with exit code 1: /Applications/Digify.app/Contents/Resources/ffmpeg -i /Users/martinbarker/Downloads/Felix Lebarty - Bobo/01. Bobo.mp3 -y -filter_complex concat=n=1:v=0:a=1 -c:a libmp3lame -b:a 320k /Users/martinbarker/Downloads/Felix Lebarty - Bobo/output-064237.mp3
ffmpeg version N-101191-g51a9f487ae-ntd_20150128 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: pkg_config='pkg-config --static' --pkg-config-flags=--static --libdir=/usr/local/lib --extra-version=ntd_20150128 --disable-shared --disable-lzma --enable-gpl --enable-pthreads --enable-nonfree --disable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libx264 --enable-static --enable-filters --enable-runtime-cpudetect
  libavutil      56. 65.100 / 56. 65.100
  libavcodec     58.125.100 / 58.125.100
  libavformat    58. 68.100 / 58. 68.100
  libavdevice    58. 12.100 / 58. 12.100
  libavfilter     7.107.100 /  7.107.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[mp3 @ 0x7feeae809c00] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from '/Users/martinbarker/Downloads/Felix Lebarty - Bobo/01. Bobo.mp3':
  Metadata:
    comment         : 
    album           : Bobo
    artist          : Felix Lebarty
    title           : Funkytown Eklablog
    genre           : Boogie
    date            : 1984
  Duration: 00:05:19.53, start: 0.000000, bitrate: 320 kb/s
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
/Users/martinbarker/Downloads/Felix Lebarty - Bobo/output-064237.mp3: Operation not permitted
    at makeError (/Applications/Digify.app/Contents/Resources/app.asar/node_modules/execa/lib/error.js:59)
    at handlePromise (/Applications/Digify.app/Contents/Resources/app.asar/node_modules/execa/index.js:114)
    at async file:/Applications/Digify.app/Contents/Resources/app.asar/src/js/newindex.js:1162


  


  Command failed with exit code 1: Operation not permitted

  


• Basic "pass-through" use of FFmpegReader/FFmpegWriter in scikit-video

  6 février 2021, par JonathanZ supports MonicaC

  I am starting to use scikit-video and am having trouble writing files. I have reduced the problem to the simplest possible example

  


  vid_file = "6710185719062326259_stamp_25pct.mp4"
output_file = "out_temp3.mp4"
reader = skvideo.io.FFmpegReader(vid_file)
writer = skvideo.io.FFmpegWriter(output_file)
for frame in reader.nextFrame():
        writer.writeFrame(frame)
writer.close()


  


  I'm playing the files in VLC, and the vid_file is valid but the output file, though playable, is mostly big green blocks (though I can discern some details from the original video in it).

  


  My goal, or course, is to do "interesting" manipulations of the frame before I write it out, but I need to get the "no modifications" version working correctly first. I'm also going to be using this on large files, so the vread/vwrite functions that process an entire file at once are not appropriate.

  


  I'm guessing I need to set the appropriate values in the outputdict parameter for the FFmpegWriter, but there are so many that I don't know where to start. I have tried

  


  writer = skvideo.io.FFmpegWriter(output_file, outputdict={'-crf': '0', '-pix_fmt': 'rgb24'})


  


  (-crf 0 to suppress any compression, -pixfmt rgb24 as that's what FFmpegReader says it delivers by default, but these don't work either.

  


  Any ideas on how to make this work ?

  


  Here's the skvideo.io.ffprobe video information for the input file.

  


  {
    "@index": "0",
    "@codec_name": "h264",
    "@codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    "@profile": "High",
    "@codec_type": "video",
    "@codec_time_base": "1/30",
    "@codec_tag_string": "avc1",
    "@codec_tag": "0x31637661",
    "@width": "480",
    "@height": "270",
    "@coded_width": "480",
    "@coded_height": "272",
    "@has_b_frames": "2",
    "@pix_fmt": "yuv420p",
    "@level": "21",
    "@chroma_location": "left",
    "@refs": "1",
    "@is_avc": "true",
    "@nal_length_size": "4",
    "@r_frame_rate": "15/1",
    "@avg_frame_rate": "15/1",
    "@time_base": "1/15360",
    "@start_pts": "0",
    "@start_time": "0.000000",
    "@duration_ts": "122880",
    "@duration": "8.000000",
    "@bit_rate": "183806",
    "@bits_per_raw_sample": "8",
    "@nb_frames": "120",
    "disposition": {
        "@default": "1",
        "@dub": "0",
        "@original": "0",
        "@comment": "0",
        "@lyrics": "0",
        "@karaoke": "0",
        "@forced": "0",
        "@hearing_impaired": "0",
        "@visual_impaired": "0",
        "@clean_effects": "0",
        "@attached_pic": "0",
        "@timed_thumbnails": "0"
    },
    "tag": [
        {
            "@key": "language",
            "@value": "und"
        },
        {
            "@key": "handler_name",
            "@value": "VideoHandler"
        }
    ]
}


  


  I will mention that when I ffprobe the output file the only differences I see are 1) the timing data is different, which isn't surprising, and 2) the output file has

  


      "@has_b_frames": "0",
    "@pix_fmt": "yuv444p",


  


  I'm pretty confident the reader is working okay, because if I write out the data with

  


  skimage.io.imsave('x.png', frame,  check_contrast=False)


  


  it looks good.

  


• "Could not demultiplex stream" in loading Video recorded by Opencv's VideoWriter

  21 novembre 2020, par batuman

  My program is

  



  int main(){&#xA;    cout &lt;&lt; "Start the process" &lt;&lt; endl;&#xA;    cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");&#xA;    cout &lt;&lt; "Camera connection done!" &lt;&lt; endl;&#xA;    cv::Mat image, small;&#xA;    //Output video&#xA;    cv::Size S = cv::Size((int) vcap.get(CV_CAP_PROP_FRAME_WIDTH), (int) vcap.get(CV_CAP_PROP_FRAME_HEIGHT));&#xA;    int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));&#xA;    int fps = vcap.get(CV_CAP_PROP_FPS);&#xA;    cout &lt;&lt; "fps " &lt;&lt; fps &lt;&lt; " ex " &lt;&lt; ex &lt;&lt; endl;&#xA;    cv::VideoWriter outputVideo;&#xA;    outputVideo.open("TEST.avi", ex/*CV_FOURCC(&#x27;X&#x27;, &#x27;2&#x27;, &#x27;6&#x27;, &#x27;4&#x27;)*/, vcap.get(CV_CAP_PROP_FPS), S, true);&#xA;    if(!outputVideo.isOpened()){&#xA;        cout &lt;&lt; "Could not open the output video for write" &lt;&lt; endl;&#xA;        return -1;&#xA;    }&#xA;&#xA;    for(;;){&#xA;        if(!vcap.read(image)){&#xA;            std::cout &lt;&lt; "No frame" &lt;&lt; std::endl;&#xA;            cv::waitKey(0);&#xA;        }&#xA;&#xA;        cv::resize(image, small, image.size()/2, 0, 0 , cv::INTER_LINEAR);&#xA;        cv::imshow("Display", small);&#xA;        cv::waitKey(1);&#xA;        outputVideo.write(small);&#xA;        if(getkey() == &#x27;\n&#x27;)&#xA;            break;&#xA;    }&#xA;    cout &lt;&lt; "Camera release" &lt;&lt; endl;&#xA;    outputVideo.release();&#xA;    vcap.release();&#xA;    image.release();&#xA;    small.release();&#xA;    return 0;&#xA;}&#xA;</int>

  



  int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));</int> ex is 0 here.

  



  I can record the TEST.avi, but can't be read by cv::VideoCapture vcap("TEST.avi") ; or VLC player or Videos in Ubuntu.
The error is "Could not demultiplex stream".

  



  If I changed to

  



  outputVideo.open("TEST.avi", CV_FOURCC('X', '2', '6', '4'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('P','I','M','1'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('M', 'P', '4', '2'), vcap.get(CV_CAP_PROP_FPS), S, true);
etc.


  



  all have same problem.

  



  If I set

  



  outputVideo.open("TEST.avi", CV_FOURCC('i', 'Y', 'U', 'V'), vcap.get(CV_CAP_PROP_FPS), S, true);


  



  I have error as Opencv: FFMPEG iYUV is not supported with codec id 14

  



  For

  



  outputVideo.open("TEST.avi", CV_FOURCC('M', 'J', 'P', 'G'), vcap.get(CV_CAP_PROP_FPS), S, true);


OpenCV Error: Assertion failed (img.cols == width && img.rows == height && chann
els == 3) in write, file /home/Softwares/opencv/opencv/modules/videoio/src/
cap_mjpeg_encoder.cpp, line 829
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/Softwares/opencv/opencv/modules/videoio/src/cap_mjpeg_enco
der.cpp:829: error: (-215) img.cols == width && img.rows == height && channels =
= 3 in function write


  



  What could be wrong ? Is that my FFMPEG has problem ?