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• Insert text on sequence of image and create video using imagemagick or graphicsmagick with node.js

  12 décembre 2015, par Keyur Sakaria

  I am trying to create a sequence of image with dynamic text using imagemagick and then convert into video using ffmpeg. The issue I am facing right now :

  1. I was able to put text on image but now I want to move that text and sync with the character on image. Below is the link of what I have achieved

  http://tinypic.com/player.php?v=2ciic8g%3E&s=9#.VmrAZUp97Dc

  The bright white "text goes here" text should sync with the character behind

  Below is the code which I have written

  gm("original_images/moving/" + text + ".png")
  
      .fill("#FCF7FB")
  
      .fontSize(40)
  
      .drawText(x, moveY, "text goes here", "center")
  
      .font("font/BTTTRIAL_1.ttf")
  
      .write("newImages/demo" + i + ".png", function(err)
  
      {
  
          count++;
  
          console.log("success : " + err);
  
          console.log("i : " + i);
  
          console.log("moving : " + moveX);
  
  
  
          if(count == 72)
  
          {
  
              console.log(count);
  
              var date = moment().format('MMMMDDYYYYhmmssa');
  
              var cmd = 'ffmpeg -r 17 -i newImages/demo%d.png -c:v libx264 -r 24 -pix_fmt yuv420p output/' + date + '.mp4';
  
  
  
              exec(cmd, function(error, stdout, stderr)
  
              {
  
                  console.log(error)
  
                  console.log(stdout)
  
                  console.log(stderr)
  
              });
  
          }
  
      });

  I am trying to calculate x and y according to image and im getting the values in decimal, which graphicsmagick is not considering and rounding it thus text is not syncing with image and goes up and down

  If you have any other suggestions or ways to achieve what im trying to do please let me know.

  Thanks in advance.

• How to store a raw RTSP video stream to a file ?

  12 janvier 2016, par Siva Prasanna

  I’m playing around with the open source FFMpeg tool. I want to save an RTSP video stream to a local file. I came across this question and I tried executing a similar command, but its not working. It doesn’t throw any error either. My command is :
  ffmpeg -i rtsp://test.vibrtech.com/mov/video.sav?MAC=00C2100F124^&channel=2^&GUID=betauser -acodec copy -vcodec copy c:/video.mp4

  but when I execute this command all I’m getting is this(with the cursor being blinked like forever, until I manually invoke ctrl+c) :

  D:\..\bin>ffmpeg -i rtsp://test.vibrtech.com/mov/video.sav?MAC=00C2100F124^&channel=2^&GUID=betauser -acodec copy -vcodec copy c:/video.mp4
  
  
  
  ffmpeg version N-77704-g68eb208 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls 
  
  --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca 
  
  --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm 
  
  --enable-libilbc --enable-libmodplug --enable-libmp3lame 
  
  --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg 
  
  --enable-libopus --enable-librtmp --enable-libschroedinger 
  
  --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame 
  
  --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
  --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp 
  
  --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid 
  
  --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 12.100 / 55. 12.100
  
    libavcodec     57. 21.100 / 57. 21.100
  
    libavformat    57. 21.100 / 57. 21.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 23.100 /  6. 23.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  _

  Can anyone tell me what I’m doing wrong here ? Or is there any way this could be achieved by using other commands ?

  P.S : I’m getting the stream from this url : rtsp ://test.vibrtech.com/mov/video.sav ?MAC=00C2100F124&channel=2&GUID=betaUser

• How to scale an overlay on a video

  8 mars 2019, par Mahesh Verma

  What I am trying to do :

  How can I add an overlay image to a video that scales from frame A to frame B within time T.

  What I have achieved :

  I am able to add overlay like this :

  -filter_complex "[0:v][1:v] overlay=$X:$Y:enable='between(t,$START_TIME,$STOP_TIME)'"

  Where I am stuck :

  How can I add scaling here in this filter ?