Watch out! Some of this code may be GPL-encumbered. The decoder for JSMpeg is based in part on "Java MPEG-1 Video Decoder and Player" [1], which is licensed under the GPLv2. I am not a lawyer, but an argument could be made that the sections of JSMpeg's decoder that are directly ported from that project are a derivative work.

  [1]: https://sourceforge.net/projects/javampeg1video/