Processing library that interfaces with ffmpeg to export video files
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.idea Re-add jna to fix exported apps and Windows version Feb 11, 2018
examples clean up example Apr 30, 2018
lib Re-add jna to fix exported apps and Windows version Feb 11, 2018
resources Start version 23 Feb 28, 2018
src/com/hamoid adding streaming audio support Apr 29, 2018
web Include .startMovie() and .endMovie() in README Dec 4, 2016
.classpath Re-add jna to fix exported apps and Windows version Feb 11, 2018
.gitignore Simplify boot process. Use Preferences instead of saving txt files. Jan 26, 2015
.project Add Processing Library Template files Jan 27, 2015 Update readme Feb 28, 2018
VideoExport.iml Re-add jna to fix exported apps and Windows version Feb 11, 2018
license.txt Update library properties & build script to latest Mar 31, 2016

Video Export for Processing

This library interfaces with FFmpeg and makes it easy to export video files out of Processing.


import com.hamoid.*;

VideoExport videoExport;

void setup() {
  size(600, 600);
  videoExport = new VideoExport(this, "hello.mp4");
void draw() {
  rect(frameCount * frameCount % width, 0, 40, height);
void keyPressed() {
  if (key == 'q') {


You need to download and install FFmpeg on your system before you can use this library. Note that you might already have it installed! You can find out by typing ffmpeg or ffmpeg.exe in the terminal. If the program is not found:

For more details and download links, check the official FFmpeg website:

When you start a Processing sketch that uses this library you may be asked to indicate the location of your FFmpeg executable.

Frequent issues and questions

What if I change the location of FFmpeg?

The library should notice and ask you for its location again. The location information is saved in a json file which you can find in the library location. If you delete this json file the library will ask you for the location of FFmpeg and create the file again with the updated information.

Sometimes the resulting mp4 video files are not working. Why?

mp4 files contain essential metadata at the end of the file. The video export library saves this metadata when you call the endMovie() method. If you don't call it, the movie may be incomplete. The endMovie() method was added in version 0.1.5.

I see an FFmpeg error related to "crf". Why?

This happens if your copy of FFmpeg does not include the h264 encoder. Not all FFmpeg binaries are equal, some include more features than others. Try downloading a different or more recent binary. Let me know if that doesn't work.

Odd widths and heights not allowed

The exported video is compressed using the h264 codec. This codec does not allow odd image sizes like 111 x 113. Some computer screens actually have odd sizes like 1920 x 1059. If you use fullScreen() with such a screen, exporting will fail with an error like height not divisible by 2 (1920x1059). This will be fixed in future versions by auto correcting the requested size to an even number and notifying the user.

How can I tweak the FFmpeg command the library runs?

The first time the library runs it will produce a settings.json file, which will be placed in the library folder. This file can be carefully edited to adjust the FFmpeg parameters used during the video creation. Why would you do this? FFmpeg accepts hundreds of parametrs to define which codec to use, how the codec should behave, etc. FFmpeg also includes hundreds of audio and video filters that can be used and configured. It would not make sense for me to create hundreds of methods in the video export library to let you access all those features. If you are and advanced user, you can tweak those settings yourself by editing settings.json to change the codec settings or apply special effects to the resulting video files. See this example.

NoSuchMethodError when calling endMovie()

There seems to be a conflict between the Video Export library and the Video library. Both use different versions of the JNA library. See this discussion:

change log

  • 0.2.3 - February 28th, 2018
    • Allow spaces in the FFmpeg command (#37)
    • Allow setting the FFmpeg command settings from code, not just in the json file (#36)
  • 0.2.2 - February 11th, 2018
    • Re-add jna.jar and jna-platform.jar, fixing broken exported applications (issue 47 ) and the Windows version.
  • 0.2.1 - November 8th, 2017
  • 0.2.0 - October 22nd, 2017
    • Minor change: when calling nf(), replace ',' with '.'. Some systems may use ',' due to localization, which fails later when parsing the csv file.
  • 0.1.9 - April 22nd, 2017
    • https URL is now known by the IDE, so it's possible to install again without leaving the IDE.
    • Solve issue when attaching sound. In Ubuntu, the AAC codec inside FFmpeg is experimental, and had to be enabled in the command line.
    • Allow user customization of the FFmpeg commands that the library runs by including them inside settings.json, found in the library folder. This enables the user to tweak the commands to enable filters like blur, vignette, add noise, crop, etc. In future versions space characters should be allowed in those filter arguments.
  • 0.1.8 - April 17th, 2017
    • Switch server url to https (attempt to solve broken installation inside the IDE)
  • 0.1.7 - April 1st, 2017
    • Setting are now saved in the libray folder. Using the Java Preferences was giving errors on some Windows versions.
    • New example added to produce a video based on FFT data and making sure audio and video stay in sync.
    • In Windows, when ending a video, CTRL+C is sent to FFmpeg to terminate properly. This seems to fix corrupted videos on Windows.
    • The library now notices if FFmpeg is not found (maybe because it was moved) and asks again for its location.
  • 0.1.6 - December 8th, 2016
    • Fix for high dpi screens (Thanks to @LodenRietveld)
  • 0.1.5 - December 2nd, 2016
    • Refactoring. Clean up code.
    • Add .startMovie() and .endMovie() to prevent possible "missing-end-of-movie corruption".
    • Allow attaching a sound file to the produced movie.
    • Allow exporting multiple video files using the same videoExport object.
  • 0.1.4 - August 4th, 2016
    • Attempt to fix randomly corrupted videos on Windows
  • 0.1.3 - July 24th, 2016
    • Add webcam saving example.
    • Add getFfmpegPath() public method (requested by @ffd8).
    • Replace PGraphics with PImage, enables webcam/movie saving (requested by @transfluxus).
  • 0.1.1 - June 15th, 2016
    • Use .waitFor() to reduce chances of video corruption.
  • ...
  • 0.0.1 - January 25th, 2015