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• ERROR : "Cannot Find FFMPEG" on Google Cloud Compute Engine Debian Wheezy 7.8 Managed Instance even though it's installed

  4 October 2015, by DynamoBooster

  I wrote a Node.JS application that uses the fluent-ffmpeg module to watermark videos uploaded on the platform. I pushed the code to a my Google Cloud Compute Engine project, and every time I get Error : Cannot Find FFMPEG. I ssh’d into the instance once it was created and ran these commands to install FFMPEG before actually testing out the code. I am not sure what is causing the error because after this I am positive that FFMPEG is installed.

  sudo apt-get update
  
  sudo apt-get install -y ffmpeg
  
  export FFMPEG_PATH="/usr/bin/ffmpeg"
  
  export FFPROBE_PATH="/usr/bin/ffprobe"

  Below is my FFMPEG code

  function generate_thumbnail(name, path){
  
    logging.info("Generating Thumbnail");
  
    ffmpeg(path)
  
     .setFfmpegPath('/usr/bin/ffmpeg') 
  
     .setFfprobePath('/usr/bin/ffprobe')
  
     .on('end', function() {
  
          upload_thumbnail(name);
  
          logging.info("Thumbnail Generated and uploaded");
  
          return;
  
      })
  
    .on('error', function(err, stdout, stderr) {
  
          logging.info('ERROR: ' + err.message);
  
          logging.info('STDERR:' + stderr);
  
    })
  
    .on('start', function(commandLine) {
  
         logging.info(commandLine);
  
    })
  
    .screenshots({
  
      count: 1,
  
      filename: name + '_thumbnail.png',
  
      folder: 'public/images/thumbnails/'
  
    });
  
  }

• Find a resolution (dimension) of a video object saved in S3 - in rails

  27 September 2015, by JVK

  I have video files saved in s3 and I want to find the dimension/resolution of any file (lets assume file sizes are in 500mb) per the request comes in my rails app.

  One of the options, I have in my mind is:

  Download (getObject) the file in local memory and use ffmpeg to find the required info. I currently don’t have ffmpeg, as I don’t need that for any task.

  But, I don’t like this option, reason is - I don’t want to waste bandwidth to download it first (takes time) from S3 and then run cpu and memory intensive ffmpeg on my server to merely find the dimension/resolution of the video.

  Is there any better solution?

  S3 object HEAD call on object unfortunately doesn’t return dimension information.

• Cannot find library using gcc -shared in Eclipse to build a dll

  26 September 2015, by tishu

  I am trying to use the FFMPEG library that I just compiled on Windows using MinGW in a C program in Eclipse. I have managed to build a simple HelloJNI.c file and run it:

  gcc $(INCLUDES) -c -g -w HelloJNI.c
  
  gcc -shared -o $(BIN_DIR)/hello.dll HelloJNI.o

  I am now trying to compile a ffmpeg_native.c file that uses FFMPEG but I am getting errors running the following:

  LIBRARY_PATH = -L:"c:/Dev/msys-1.0/local/lib" -L:"c:/Dev/msys-1.0/local"
  
  INCLUDES = -I$(SRC_DIR) -I"c:/Dev/msys-1.0/local/include" -I"c:/Program Files/Java/jdk1.8.0_45/include" -I"c:/Program Files/Java/jdk1.8.0_45//include/win32"
  
  BIN_DIR = ../bin
  
  
  
  gcc $(INCLUDES) -c -g -w ffmpeg_native1.1.4.c
  
  gcc -shared -o $(BIN_DIR)/exportnative.dll ffmpeg_native1.1.4.o $(LIBRARY_PATH) -lffmpeg -lavcodec -lx264 -lavformat -lavutil -lswscale

  The first line runs fine but the second shows this output:

  c:/Dev/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/4.9.3/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lavcodec
  
  [etc for all libraries]

  I am puzzled as I am able to run the following in MinGW with success:

  ld -o /local/libffmpeg.so -L/local/lib -lavcodec -lx264 -lavformat -lavutil -lswscale