Add MKV support allowing h264 w/ alt. sound codecs (#1657)
Add MKV support allowing h264 w/ alt. sound codecs (#1657)

Added 1 line for moviepy to be able to use FFMPEG to make matroska mkv files that can handle a variety of sound codecs as well has h264 video codecs. It has allowed me to output a mkv with h264 video and pcm_s16le audio :-)
Zulko/moviepy