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• 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 ?

• 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.

• ffmpeg images-to-video script anyone ?

  3 février 2014, par danja

  I'm wanting to take a bunch of images and make a video slideshow out of them. There'll be an app for that, right ? Yup, quite a few it seems. The problem is I want the slides synced to a piece of music, and all the apps I've seen only allow you to show each slide for a multiple of a whole second. I want them to show for multiples of 1.714285714 seconds to fit with 140 bpm.

  The tools I've seen generally seem to have ffmpeg under the hood, so presumably this kind of thing could be done with a script. But ffmpeg has sooo many options...I'm hoping someone will have something close.

  I'll have up to about 100 slides, the ones that have to show for 3.428571428 secs or whatever I guess I can simply show twice.