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• Reading colors encoded in image at a position changes its value after decoded from video using php and ffmpeg

  29 novembre 2022, par Jeenus Junanio

  I created a piece of code to encode unique color on image and converted the image to PNG so that it would be lossless. After This I created a video with the frame using this image using the ffmpeg in php shellexec(). After saving this video I reopened it to extract the frmae image added and tried to read those values from the image. Now the values on the image are a bit changed.

  


  Here is the code that I tried to create the video :

  


  $canvas = imagecreatefromjpeg('translate/first_frame.jpg');
        // create a random color
        $rand = str_pad(dechex(rand(0x000000, 0xFFFFFF)), 6, 0, STR_PAD_LEFT);
        $dec_color= hexdec($rand);

        // add the new color to image

        for ($i=0; $i < 24; $i++) { 
           imagesetpixel($canvas,$i,0,$dec_color);
        }

        // store the image and close the file opened

        // $filename = 'translate/test/output.png'; 
        $filename = 'translate/test/output.bmp'; 

        // imagepng($canvas, $filename);
        imagebmp($canvas, $filename);

        imagedestroy($canvas);

        $frame      = $filename; // an image(png,gif,etc)
        $audio      = 'translate/output/audio/abcdefghijklmnopqrstuvwxya.mp3';
        $output     = 'translate/output/video/'.time().'.mp4';   

        $cmd = 'ffmpeg -loop 1 -y -i '.$frame.' -i '.$audio.' -c:v libx264 -tune stillimage -c:a copy -shortest '.$output;
        shell_exec($cmd);


  


  This above code is creating the video with the image.

  


  Now I tried to extract the image video and color from image, the colors are a bit changed.

  


  if($request->hasFile(&#x27;video&#x27;)){&#xA;            $file = $request->file(&#x27;video&#x27;);&#xA;            $filename = $file->getClientOriginalName();&#xA;            $path = public_path(&#x27;translate/test/&#x27;);&#xA;        }else{&#xA;            return &#x27;No file uploaded&#x27;;&#xA;        }&#xA;        &#xA;        &#xA;        if ($file->move($path, $filename)) {&#xA;            $video = &#x27;translate/test/&#x27;.$filename;&#xA;        }else{&#xA;            return &#x27;error file upload&#x27;;&#xA;        }&#xA;&#xA;       &#xA;        // $output = &#x27;translate/output/image/&#x27;.time().&#x27;.png&#x27;;&#xA;        $output = &#x27;translate/output/image/&#x27;.time().&#x27;.bmp&#x27;;&#xA;        // $output = &#x27;translate/output/image/&#x27;.time().&#x27;.jpg&#x27;;&#xA;&#xA;        $cmd = &#x27;ffmpeg -i &#x27;.$video.&#x27; -vframes 1 &#x27;.$output;&#xA;        shell_exec($cmd);&#xA;&#xA;&#xA;// $dimg = imagecreatefrompng($output);&#xA;        $dimg = imageCreateFromBmp($output);&#xA;        // $dimg = imagecreatefromjpeg($output);&#xA;&#xA;        $extracted_color = array();&#xA;&#xA;        for ($x=0; $x &lt; 24 ; $x&#x2B;&#x2B;) { &#xA;          $extracted_color[]= imagecolorat($dimg, $x, 0);&#xA;        }&#xA;&#xA;        echo "<br />Retrived colors:<pre>".print_r($extracted_color,1)."</pre>";&#xA;&#xA;        imagedestroy($dimg);&#xA;&#xA;&#xA;&#xA;

  


  The color added was 44743072 but the colors retrieved are 4539914,4474121,4408072,4408326 from x=0,y=0 to x=24,y=0.

  


  In both PNG and BMP I am loosing the added pixels. You can clearly see in my code i have commented the code for png to read the image as bmp.

  


  Can someone let me know if I miss anything here.

  


• FFMPEG Stream to Instagram Via instafeed.me OR YellowDuck

  3 mars 2024, par Jintor

  I'm trying to do video stream via RTMP to Instagram with FFMPEG

  


  I'm able to do it to facebook and twitter, but instagram is an other beast...

  


  when I create a live broadcast in rtmp.in or yellowduck I get a stream key

  


  when I do this

  


  ffmpeg -rtbufsize 256M -re -i file.webm -acodec libmp3lame -ar 44100 -b:a 128k -pix_fmt yuv420p -profile:v baseline -s 720x1280 -bufsize 6000k -vb 400k -maxrate 1500k -deinterlace -vcodec libx264 -preset veryfast -g 30 -r 30 -f flv rtmps://live-upload.instagram.com:443/rtmp/--key--here--


  


  ffmpeg outputs nothing, no error and I see no video in instafeed panel :(

  


  In other network I got sometimes error in ffmpeg log... but when it's to instagram : just blank nothing

  


  what do I miss ?

  


  here the log

  


  ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --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-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --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-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100


  


  and completely blank, no error, no framerate infos like any other transcoding...

  


• FFMPEG Multiple outputs from BlackMagic input

  24 septembre 2018, par leo_dragons

  I’m currently needing help to achieve multiple outputs from one input.
  Right now, the outputs are set like this :

  ffmpeg -re -f decklink -i "DeckLink Mini Recorder" -y -pix_fmt yuv420p -c:v h264 -preset fast -tune zerolatency -c:a aac -ac 2 -b:a 128k -ar 44100 -async 1 -b:v 2300k -g 5 -probesize 32 -framerate 30 -movflags +faststart -s 1280x720 -bufsize 1000k -maxrate 3072k -shortest -f flv "rtmp://10.0.0.172:1935/Testing/live_720p"
  
  ffmpeg -re -i "rtmp://10.0.0.172:1935/Testing/live_720p" -c:v h264 -preset fast -tune zerolatency -c:a aac -ac 2 -b:a 114k -ar 44100 -async 1 -b:v 900k -g 5 -probesize 32 -framerate 30 -movflags +faststart -s 854x480 -bufsize 400k -maxrate 1000k -shortest -f flv "rtmp://10.0.0.172:1935/Testing/live_480p_hq"
  
  ffmpeg -re -i "rtmp://10.0.0.172:1935/Testing/live_720p" -c:v h264 -preset fast -tune zerolatency -c:a aac -ac 2 -b:a 114k -ar 44100 -async 1 -b:v 550k -g 5 -probesize 32 -framerate 30 -movflags +faststart -s 854x480 -bufsize 400k -maxrate 500k -shortest -f flv "rtmp://10.0.0.172:1935/Testing/live_480p_lq"
  
  ffmpeg -re -i "rtmp://10.0.0.172:1935/Testing/live_720p" -c:v h264 -preset fast -tune zerolatency -c:a aac -ac 2 -b:a 114k -ar 44100 -async 1 -b:v 450k -g 5 -probesize 32 -framerate 30 -movflags +faststart -s 640x360 -bufsize 400k -maxrate 500k -shortest -f flv "rtmp://10.0.0.172:1935/Testing/live_360p" 

  This uses quite a lot of processing power, and also generates unnecessary latency (since I have to stream to WOWZA first, then back to FFMPEG and then back to WOWZA).

  And I want to optimize this.

  I’ve been trying several methods, but I only managed to overflow the decklink buffer. How could I solve this ?