diff --git a/src/format/format/flag.rs b/src/format/format/flag.rs
new file mode 100644
index 0000000..ff0f8fe
--- /dev/null
+++ b/src/format/format/flag.rs
@@ -0,0 +1,26 @@
+use libc::c_int;
+use ffi::*;
+
+bitflags! {
+	flags Flags: c_int {
+		const NO_FILE       = AVFMT_NOFILE,
+		const NEED_NUMBER   = AVFMT_NEEDNUMBER,
+		const SHOW_IDS      = AVFMT_SHOW_IDS,
+		const RAW_PICTURE   = AVFMT_RAWPICTURE,
+		const GLOBAL_HEADER = AVFMT_GLOBALHEADER,
+		const NO_TIMESTAMPS = AVFMT_NOTIMESTAMPS,
+		const GENERIC_INDEX = AVFMT_GENERIC_INDEX,
+		const TS_DISCONT    = AVFMT_TS_DISCONT,
+		const VARIABLE_FPS  = AVFMT_VARIABLE_FPS,
+		const NO_DIMENSIONS = AVFMT_NODIMENSIONS,
+		const NO_STREAMS    = AVFMT_NOSTREAMS,
+		const NO_BINSEARCH  = AVFMT_NOBINSEARCH,
+		const NO_GENSEARCH  = AVFMT_NOGENSEARCH,
+		const NO_BYTE_SEEK  = AVFMT_NO_BYTE_SEEK,
+		const ALLOW_FLUSH   = AVFMT_ALLOW_FLUSH,
+		const TS_NONSTRICT  = AVFMT_TS_NONSTRICT,
+		const TS_NEGATIVE   = AVFMT_TS_NEGATIVE,
+		const SEEK_TO_PTS   = AVFMT_SEEK_TO_PTS,
+	}
+}
+
diff --git a/src/format/format/mod.rs b/src/format/format/mod.rs
index 9cb12a6..331c399 100644
--- a/src/format/format/mod.rs
+++ b/src/format/format/mod.rs
@@ -1,3 +1,6 @@
+pub mod flag;
+pub use self::flag::Flags;
+
 mod input;
 pub use self::input::Input;
 
diff --git a/src/format/mod.rs b/src/format/mod.rs
index f9143eb..66aa43f 100644
--- a/src/format/mod.rs
+++ b/src/format/mod.rs
@@ -8,6 +8,7 @@ pub use self::context::Context;
 
 pub mod format;
 pub use self::format::{Input, Output, list};
+pub use self::format::{flag, Flags};
 
 pub mod network;