This is a fork of the ffmpeg crate by meh., compatible with FFmpeg major version 4 (tested against 4.0.2). FFmpeg4 code is guarded by the ffmpeg4 feature, enabled by the default. Disable ffmpeg4 to compile against FFmpeg 3.x (tested against 3.4.4). Earlier versions of FFmpeg are not officially supported. See my command line tool metadata's Cargo.toml for example usage when supporting both major versions of FFmpeg.