File: //usr/share/doc/ffmpeg/README.Debian
FFmpeg packaged for Debian
==========================
FFmpeg built with as many features enabled as possible,
for main libraries as long as the result is still GPLv2+,
and for -extra libraries as the result is GPLv3+.
Please see TODO.Debian for features potentially enabled later.
The following features are unlikely to be enabled:
--enable-libcelt abandoned upstream, superseded by opus (bug#676592)
--enable-crystalhd unusable in Debian, firmware missing (bug#917292)
--enable-librtmp built-in RTMP support is better, and has listen mode
--enable-mbedtls superfluous: already using GnuTLS as TLS implementation
--enable-libmodplug superseded by libopenmpt (bug#849840)
--enable-libv4l2 only needed for very old devices and may cause problems for others
for those needing it, us LD_PRELOAD pointing on libv4l2
--enable-opencv broken with OpenCV >= 3.4 (see <https://trac.ffmpeg.org/ticket/7059>)