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• Convert raw image using open-source library with permissive license

  30 août 2011, par Brian

  I need to convert a raw, rgb32-formatted image to a PNG with a library (written in, in order of preference, Java, C, C++) having a permissive (e.g. BSD or Apache) license.

  I'm able to convert the image using FFmpeg with this call :

  ffmpeg.exe -vframes 1 -vcodec rawvideo -f rawvideo -pix_fmt rgb32 -s 20x40 -i infile -f image2 -vcodec png out.png

  where 20x40 is the width by the height.

  But, sadly, I need to avoid FFmpeg due to its license.

  I've seen people speculate that libpng could do the job, but I'm skeptical given the documentation I've seen at the libpng site. Perhaps you'll give an example.

  I don't know what the rawvideo and rgb32 values mean to FFmpeg, so I asked this question.

  EDIT 1 : edited the ffmpeg call to show width x height.

• How to get a loading return value

  5 septembre 2011, par anthonypliu

  I am trying to create a loading progress bar for my function :

  private string ConvertToFLV(string phyicalFilePath)
  
          {
  
              if (Path.GetExtension(phyicalFilePath).Equals(".flv")) return phyicalFilePath;
  
  
  
                  var argument = string.Format(@"-i ""{0}"" -vcodec flv -f flv -r 29.97 -s 320x240 -aspect 4:3 -b 300k -g 160 -cmp dct  -subcmp dct  -mbd 2 -flags +aic+cbp+mv0+mv4 -trellis 1 -ac 1 -ar 22050 -ab 56k ""{1}""", phyicalFilePath, Path.ChangeExtension(phyicalFilePath, "flv"));
  
                 // var argument = string.Format("-i {0} -crf 35.0 -vcodec libx264 -acodec libfaac -ar 48000 -ab 128k -coder 1 -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -me_method hex -subq 6 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -threads 0 {1}", phyicalFilePath, Path.ChangeExtension(phyicalFilePath, "mp4"));
  
                  File.Delete(Path.ChangeExtension(phyicalFilePath, "flv"));
  
  
  
                  ProcessStartInfo process = new ProcessStartInfo(ffmpegPhysicalPath, argument);
  
                  Process proc = new Process();
  
                  proc.StartInfo = process;
  
                  proc.Start();
  
                  proc.WaitForExit();
  
  
  
                  return Path.ChangeExtension(phyicalFilePath, "flv");
  
  
  
  
  
  
  
          }

  Whent he command "proc.WaitForExit()" is invoked, I want to be able to return some type of load percentage. In the frontend I just have a gif loading image, but I want to be able to show progress on this, is there a way to do this ?

• FFMPEG : Videos converted from FLV to MP4 does not play in iPod but works in iPhone

  3 juin 2012, par Shakti Singh

  I used below command to convert videos from FLV,M4V to MP4.

  ffmpeg -y -i video_1336406262.flv -vcodec libx264 -vpre slow -vpre
  ipod640 -b 250k -bt 50k -acodec libfaac -ac 2 -ar 48000 -ab 64k -s
  480x320 video_1336406262.mp4

  The videos converted from M4V to MP4 are playing very well in both iPhone and iPod but the videos converted from FLV to MP4 does not work in iPod but does in iPhone.

  In the video area of HTML5 page iPod even does not show the play symbol.

  Could someone help here ?

  I am using the same command to convert from both FLV and M4V to MP4.

  Thanks