MythTV imports the following external code:

Library Name	Upstream Library Location	Last imported revision (upstream)	Last imported date	Changeset	Comments
external/FFmpeg	​http://git.ffmpeg.org/	release/4.0 branch n4.0-45-g3dc75278a9	2018-05-30	​9dee6dd8
libbluray	​http://git.videolan.org/git/libbluray.git	1.0.2+ (git 8c15fdad)	2018-05-21	​3ea8dda2
libdvdnav/libdvdread	​http://svn.mplayerhq.hu/	1239	09/07/12	​71869c79
libhdhomerun	​http://www.silicondust.com/support/hdhomerun/downloads/linux/	20100519beta1	05/19/10	​baf36e4b
libmpeg2	​http://libmpeg2.sourceforge.net/	Unknown	01/21/05	​2357c6a7	Used in lossless transcoder; See, also, ​28cd7a1c
minilzo	​http://www.oberhumer.com/opensource/lzo/	2.03	08/17/09	​9a7ca8a2 ​ed7829fe	Backport in ​9ab98c9f has a typo, mentioning version 2.07
libsamplerate	​http://www.mega-nerd.com/SRC/index.html	0.1.7	10/18/09	​5f7280d6
libsoundtouch	​http://www.surina.net/soundtouch/	1.3.1	05/23/06	​14a7fbf7
FreeFont? fonts	​http://savannah.gnu.org/projects/freefont/	20090104	07/20/10	​aff5f8eb
lirc_client	​http://www.lirc.org/	0.8.6	07/23/10	​21f80da4
replex	?	0.1.4	?	?	Marcus Metzler