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• I want to record my computer screen and stream it to other computer browser over same network

  25 décembre 2022, par Abdullah Qasim

  I am using Flask for this purpose. I wanted to create a rtmp server that stream the screen in web browser.

  


  My Python Code is :

  


  import os
import subprocess

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def index():
    return render_template('index.html')

if __name__ == '__main__':
    # Start the RTMP server in a separate process
    subprocess.Popen(['ffmpeg', '-f', 'gdigrab', '-framerate', '25', '-probesize', '100000000000', '-i', 'desktop', '-vcodec', 'libx264', '-preset', 'ultrafast', '-tune', 'zerolatency', '-f', 'flv', 'rtmp://localhost:5000/live/stream_name'])

    # Start the Flask app
    app.run()



  


  My HTML code is :

  


  &#xA;  &#xA;    &#xA;    &#xA;    <code class="echappe-js">&lt;script src=&quot;https://unpkg.com/video.js/dist/video.js&quot;&gt;&lt;/script&gt;&#xA;  &#xA;  &#xA;    &#xA;    &lt;script&gt;&amp;#xA;      var player = videojs(&amp;#x27;my-video&amp;#x27;);&amp;#xA;    &lt;/script&gt;&#xA;  &#xA;&#xA;&#xA;

  


  When I run the flask app it produces an error :

  


  * Serving Flask app 'server' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
ffmpeg version N-109449-gb92260f70a-20221223 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.2.0 (crosstool-NG 1.25.0.90_cf9beb1)
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --disable-libmfx --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20221223
  libavutil      57. 43.100 / 57. 43.100
  libavcodec     59. 55.103 / 59. 55.103
  libavformat    59. 34.102 / 59. 34.102
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 53.100 /  8. 53.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
[gdigrab @ 00000134692d9cc0] Capturing whole desktop as 1280x1024x32 at (0,0)
Input #0, gdigrab, from 'desktop':
  Duration: N/A, start: 1671986678.012939, bitrate: 1048586 kb/s
  Stream #0:0: Video: bmp, bgra, 1280x1024, 1048586 kb/s, 25 fps, 25.08 tbr, 1000k tbn
127.0.0.1 - - [25/Dec/2022 21:44:39] code 400, message Bad request version ('û\x9beùSØHãEieÐ×kbz\x84ã^\x9dÚ½\x8bCðúÚîE\x8cßYë×s\x92.')
127.0.0.1 - - [25/Dec/2022 21:44:39] "♥ |☻÷xU▲Ϋ▲6/Åp²fÔ☻ a↑¢.6Õü+c)Â.çÇÉ°µ³Eߨ9ê;Èy ►hBZ¡↨LµrXÏëâM¤.Äÿ{@o↑É[ýÐNäo2¶¤{ö°RTâZ驨´ÅIon×ƶ¼ÈAiæ>7/þ↑m¨Q8bů޵¡!wâÙâÄt±õ§ð² ®
      ·×«2ùðT«{                   ý?ò¸ö$¬pòpów4êñOf¬=dâ2♣D¤B                            ¤↓▲ôm<·-/"CÑu*A&2Öj uõÓ☻ô\ß+ŧ«ø↑1☺Φúì\yª~Ç↑▲¤Yín
eîÔioPþ♣ü Mí▲^ôüdÕ{∟¶¶jE▼j♦1VÒYW×▼©Àñ_K|÷¶Ã}¦  ↑a↔;☻ÿ|É@8u7Ó8.AkÕuwMùÊ÷H5!PÎÐÛ´▼Ãdá~5iã
▬e
ûùSØHãEieÐ×kbz
              ã^CðúÚîEßYë×s." 400 -
[rtmp @ 000001346ae35180] Cannot read RTMP handshake response
rtmp://localhost:5000/live/stream_name: End of file


  


  I have searched on internet to fix this error but did not got any help.

  


• ffmpeg with delayed inputs put an extra audio output at 0 seconds

  19 mars 2023, par Ralph

  Can someone explain why the input files are played 4 times in total, at 0, 1, 2, 3 seconds.

  


  

  1. The ffmpeg processes three input files (mp3).

  


  2. The complex filter delays the inputs by 1, 2, 3 seconds input-wise.

  


  3. amix mixes the delayed outputs together.

  


  4. And finally, a coded transforms it into an output mp3.

  


  


  ffmpeg -i in0.mp3 -i in1.mp3 -i in2.mp3 -filter_complex "[0]adelay=1000[delayed1];[1]adelay=2000[delayed2];[2]adelay=3000[delayed3];[delayed1][delayed2][delayed3]amix=inputs=3:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3


  


  short version : 2 delayed beeps, an finally there come 3 beeps out (@ 0, 1, 2 seconds) :

  


  ffmpeg -i beep.mp3 -filter_complex "[0]adelay=1000[delayed1];[0]adelay=2000[delayed2];[delayed1][delayed2]amix=inputs=2:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3


  


  ffmpeg version N-110011-gf456c192d9-tessus on a Mac M1.

  


  I added also a silent input file from 0 to 1 seconds without any alteration of the outcome.
I added a silent stream as input as well without improvement. E.g. :

  


  ... -filter_complex "aevalsrc=0:d=4[silence];...


  


  Another test with another ffmpeg version 5.1 Copyright (c) 2000-2022 the FFmpeg developers built with Apple clang version 13.1.6 (clang-1316.0.21.2.5) :
ffmpeg -i beep.mp3 -filter_complex "[0]adelay=1000[delayed1];aevalsrc=0:d=5[silence];[silence][delayed1]amix=inputs=2:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3
There are again 2 beeps, at 0 and 1 second - going mad here !

  


  (concat solves the issue. But I want to have a flexible solution with possibly overlapping audio streams.) Thanks for giving a hint !

  


• Fluent-ffmpeg node js adding subtitles properly on mac but isn't working on ubuntu

  23 décembre 2022, par Ibrahim Nabi

  I have the same version on both OS but still get different output.

  


  Here is the output that I get on ubuntu for Bengali subtitles :
Ubuntu Output Subtitles

  


  Here is the version and configuration for ubuntu 20 :

  


  `

  


  ffmpeg version 5.1.2-0ubuntu1~20.04.sav1.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --prefix=/usr --extra-version='0ubuntu1~20.04.sav1.1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-lcms2 --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-sndio --enable-pocketsphinx --enable-librsvg --enable-libdav1d --enable-libjxl --enable-librist --enable-libvmaf --enable-libzimg --enable-crystalhd --enable-libmfx --enable-libsvtav1 --enable-libdc1394 --enable-libdrm --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


  


  `

  


  And here is the version and config for mac os :

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers built with Apple clang version 14.0.0 (clang-1400.0.29.102) configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon 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

  


  Also My code is simply this :

  


  `

  


   ffmpeg(fileName)
    .videoCodec("libx264")
    .audioCodec("libmp3lame")
    .outputOptions(`-vf subtitles=${subtitlesPath}`)
    .on("error", function (err) {
      callback(true, err);
    })
    .save(outputBurnedVideo)
    .on("end", async function () {
      await callback(false, "done");
    });


  


  `

  


  I have tried using the sub_charenc option but I wasn't able to get the proper result.