*: refactor setters to return self

src/codec/context.rs

@@ -62,10 +62,12 @@ impl Context {
 		}
 	}
 
-	pub fn set_flags(&mut self, value: Flags) {
+	pub fn set_flags(&mut self, value: Flags) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).flags = value.bits() as c_int;
 		}
+
+		self
 	}
 
 	pub fn id(&self) -> Id {
@@ -86,12 +88,14 @@ impl Context {
 		}
 	}
 
-	pub fn set_threading(&mut self, config: threading::Config) {
+	pub fn set_threading(&mut self, config: threading::Config) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).thread_type           = config.kind.into();
 			(*self.as_mut_ptr()).thread_count          = config.count as c_int;
 			(*self.as_mut_ptr()).thread_safe_callbacks = if config.safe { 1 } else { 0 };
 		}
+
+		self
 	}
 
 	pub fn threading(&self) -> threading::Config {

src/codec/decoder/audio.rs

@@ -64,16 +64,20 @@ impl Audio {
 		}
 	}
 
-	pub fn set_channel_layout(&mut self, value: ChannelLayout) {
+	pub fn set_channel_layout(&mut self, value: ChannelLayout) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).channel_layout = value.bits();
 		}
+
+		self
 	}
 
-	pub fn request_channel_layout(&mut self, value: ChannelLayout) {
+	pub fn request_channel_layout(&mut self, value: ChannelLayout) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).request_channel_layout = value.bits();
 		}
+
+		self
 	}
 
 	pub fn audio_service(&mut self) -> AudioService {

src/codec/decoder/video.rs

@@ -84,28 +84,36 @@ impl Video {
 		}
 	}
 
-	pub fn set_slice_count(&mut self, value: usize) {
+	pub fn set_slice_count(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).slice_count = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_slice_flags(&mut self, value: slice::Flags) {
+	pub fn set_slice_flags(&mut self, value: slice::Flags) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).slice_flags = value.bits();
 		}
+
+		self
 	}
 
-	pub fn skip_top(&mut self, value: usize) {
+	pub fn skip_top(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).skip_top = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn skip_bottom(&mut self, value: usize) {
+	pub fn skip_bottom(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).skip_bottom = value as c_int;
 		}
+
+		self
 	}
 
 	pub fn references(&self) -> usize {
@@ -114,10 +122,12 @@ impl Video {
 		}
 	}
 
-	pub fn set_field_order(&mut self, value: FieldOrder) {
+	pub fn set_field_order(&mut self, value: FieldOrder) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).field_order = value.into();
 		}
+
+		self
 	}
 
 	// intra_matrix

src/codec/encoder/audio.rs

@@ -54,10 +54,12 @@ impl Audio {
 		}
 	}
 
-	pub fn set_rate(&mut self, rate: i32) {
+	pub fn set_rate(&mut self, rate: i32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).sample_rate = rate;
 		}
+
+		self
 	}
 
 	pub fn rate(&self) -> u32 {
@@ -66,10 +68,12 @@ impl Audio {
 		}
 	}
 
-	pub fn set_format(&mut self, value: format::Sample) {
+	pub fn set_format(&mut self, value: format::Sample) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).sample_fmt = value.into();
 		}
+
+		self
 	}
 
 	pub fn format(&self) -> format::Sample {
@@ -78,10 +82,12 @@ impl Audio {
 		}
 	}
 
-	pub fn set_channel_layout(&mut self, value: ChannelLayout) {
+	pub fn set_channel_layout(&mut self, value: ChannelLayout) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).channel_layout = value.bits();
 		}
+
+		self
 	}
 
 	pub fn channel_layout(&self) -> ChannelLayout {
@@ -90,10 +96,12 @@ impl Audio {
 		}
 	}
 
-	pub fn set_channels(&mut self, value: i32) {
+	pub fn set_channels(&mut self, value: i32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).channels = value;
 		}
+
+		self
 	}
 
 	pub fn channels(&self) -> u16 {

src/codec/encoder/encoder.rs

@@ -35,31 +35,39 @@ impl Encoder {
 		}
 	}
 
-	pub fn set_bit_rate(&mut self, value: usize) {
+	pub fn set_bit_rate(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).bit_rate = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_max_bit_rate(&mut self, value: usize) {
+	pub fn set_max_bit_rate(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).rc_max_rate = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_tolerance(&mut self, value: usize) {
+	pub fn set_tolerance(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).bit_rate_tolerance = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_quality(&mut self, value: usize) {
+	pub fn set_quality(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).global_quality = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_compression(&mut self, value: Option<usize>) {
+	pub fn set_compression(&mut self, value: Option<usize>) -> &mut Self {
 		unsafe {
 			if let Some(value) = value {
 				(*self.as_mut_ptr()).compression_level = value as c_int;
@@ -68,15 +76,19 @@ impl Encoder {
 				(*self.as_mut_ptr()).compression_level = -1;
 			}
 		}
+
+		self
 	}
 
-	pub fn set_time_base<R: Into<Rational>>(&mut self, value: R) {
+	pub fn set_time_base<R: Into<Rational>>(&mut self, value: R) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).time_base = value.into().into();
 		}
+
+		self
 	}
 
-	pub fn set_frame_rate<R: Into<Rational>>(&mut self, value: Option<R>) {
+	pub fn set_frame_rate<R: Into<Rational>>(&mut self, value: Option<R>) -> &mut Self {
 		unsafe {
 			if let Some(value) = value {
 				(*self.as_mut_ptr()).framerate = value.into().into();
@@ -86,6 +98,8 @@ impl Encoder {
 				(*self.as_mut_ptr()).framerate.den = 1;
 			}
 		}
+
+		self
 	}
 }
 

src/codec/encoder/video.rs

@@ -54,10 +54,12 @@ impl Video {
 		}
 	}
 
-	pub fn set_width(&mut self, value: u32) {
+	pub fn set_width(&mut self, value: u32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).width = value as c_int;
 		}
+
+		self
 	}
 
 	pub fn width(&self) -> u32 {
@@ -66,10 +68,12 @@ impl Video {
 		}
 	}
 
-	pub fn set_height(&mut self, value: u32) {
+	pub fn set_height(&mut self, value: u32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).height = value as c_int;
 		}
+
+		self
 	}
 
 	pub fn height(&self) -> u32 {
@@ -78,16 +82,20 @@ impl Video {
 		}
 	}
 
-	pub fn set_gop(&mut self, value: u32) {
+	pub fn set_gop(&mut self, value: u32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).gop_size = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_format(&mut self, value: format::Pixel) {
+	pub fn set_format(&mut self, value: format::Pixel) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).pix_fmt = value.into();
 		}
+
+		self
 	}
 
 	pub fn format(&self) -> format::Pixel {
@@ -96,151 +104,199 @@ impl Video {
 		}
 	}
 
-	pub fn set_motion_estimation(&mut self, value: MotionEstimation) {
+	pub fn set_motion_estimation(&mut self, value: MotionEstimation) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).me_method = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_max_b_frames(&mut self, value: usize) {
+	pub fn set_max_b_frames(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).max_b_frames = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_b_quant_factor(&mut self, value: f32) {
+	pub fn set_b_quant_factor(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).b_quant_factor = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_b_quant_offset(&mut self, value: f32) {
+	pub fn set_b_quant_offset(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).b_quant_offset = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_i_quant_factor(&mut self, value: f32) {
+	pub fn set_i_quant_factor(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).i_quant_factor = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_i_quant_offset(&mut self, value: f32) {
+	pub fn set_i_quant_offset(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).i_quant_offset = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_lumi_masking(&mut self, value: f32) {
+	pub fn set_lumi_masking(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).lumi_masking = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_temporal_cplx_masking(&mut self, value: f32) {
+	pub fn set_temporal_cplx_masking(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).temporal_cplx_masking = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_spatial_cplx_masking(&mut self, value: f32) {
+	pub fn set_spatial_cplx_masking(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).spatial_cplx_masking = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_p_masking(&mut self, value: f32) {
+	pub fn set_p_masking(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).p_masking = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_dark_masking(&mut self, value: f32) {
+	pub fn set_dark_masking(&mut self, value: f32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).dark_masking = value as c_float;
 		}
+
+		self
 	}
 
-	pub fn set_prediction(&mut self, value: Prediction) {
+	pub fn set_prediction(&mut self, value: Prediction) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).prediction_method = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_aspect_ratio<R: Into<Rational>>(&mut self, value: R) {
+	pub fn set_aspect_ratio<R: Into<Rational>>(&mut self, value: R) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).sample_aspect_ratio = value.into().into();
 		}
+
+		self
 	}
 
-	pub fn set_me_comparison(&mut self, value: Comparison) {
+	pub fn set_me_comparison(&mut self, value: Comparison) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).me_cmp = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_me_sub_comparison(&mut self, value: Comparison) {
+	pub fn set_me_sub_comparison(&mut self, value: Comparison) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).me_sub_cmp = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_mb_comparison(&mut self, value: Comparison) {
+	pub fn set_mb_comparison(&mut self, value: Comparison) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).mb_cmp = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_ildct_comparison(&mut self, value: Comparison) {
+	pub fn set_ildct_comparison(&mut self, value: Comparison) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).ildct_cmp = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_dia_size(&mut self, value: usize) {
+	pub fn set_dia_size(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).dia_size = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_last_predictors(&mut self, value: usize) {
+	pub fn set_last_predictors(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).last_predictor_count = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_pre_me(&mut self, value: MotionEstimation) {
+	pub fn set_pre_me(&mut self, value: MotionEstimation) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).pre_me = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_me_pre_comparison(&mut self, value: Comparison) {
+	pub fn set_me_pre_comparison(&mut self, value: Comparison) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).me_pre_cmp = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_pre_dia_size(&mut self, value: usize) {
+	pub fn set_pre_dia_size(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).pre_dia_size = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_me_subpel_quality(&mut self, value: usize) {
+	pub fn set_me_subpel_quality(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).me_subpel_quality = value as c_int;
 		}
+
+		self
 	}
 
-	pub fn set_me_range(&mut self, value: usize) {
+	pub fn set_me_range(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).me_range = value as c_int;
 		}
+
+		self
 	}
 	
-	pub fn set_intra_quant_bias(&mut self, value: Option<usize>) {
+	pub fn set_intra_quant_bias(&mut self, value: Option<usize>) -> &mut Self {
 		unsafe {
 			if let Some(value) = value {
 				(*self.as_mut_ptr()).intra_quant_bias = value as c_int;
@@ -249,9 +305,11 @@ impl Video {
 				(*self.as_mut_ptr()).intra_quant_bias = FF_DEFAULT_QUANT_BIAS;
 			}
 		}
+
+		self
 	}
 
-	pub fn set_inter_quant_bias(&mut self, value: Option<usize>) {
+	pub fn set_inter_quant_bias(&mut self, value: Option<usize>) -> &mut Self {
 		unsafe {
 			if let Some(value) = value {
 				(*self.as_mut_ptr()).inter_quant_bias = value as c_int;
@@ -260,18 +318,24 @@ impl Video {
 				(*self.as_mut_ptr()).inter_quant_bias = FF_DEFAULT_QUANT_BIAS;
 			}
 		}
+
+		self
 	}
 
-	pub fn set_mb_decision(&mut self, value: Decision) {
+	pub fn set_mb_decision(&mut self, value: Decision) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).mb_decision = value.into();
 		}
+
+		self
 	}
 
-	pub fn set_intra_dc_precision(&mut self, value: u8) {
+	pub fn set_intra_dc_precision(&mut self, value: u8) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).intra_dc_precision = value as c_int;
 		}
+
+		self
 	}
 }
 

src/codec/packet/mod.rs

@@ -69,21 +69,25 @@ impl Packet {
 		}
 	}
 
-	pub fn rescale_ts<S, D>(&mut self, source: S, destination: D)
+	pub fn rescale_ts<S, D>(&mut self, source: S, destination: D) -> &mut Self
 		where S: Into<Rational>,
 		      D: Into<Rational>
 	{
 		unsafe {
 			av_packet_rescale_ts(self.as_mut_ptr(), source.into().into(), destination.into().into());
 		}
+
+		self
 	}
 
 	pub fn flags(&self) -> Flags {
 		Flags::from_bits_truncate(self.0.flags)
 	}
 
-	pub fn set_flags(&mut self, value: Flags) {
+	pub fn set_flags(&mut self, value: Flags) -> &mut Self {
 		self.0.flags = value.bits();
+
+		self
 	}
 
 	pub fn is_key(&self) -> bool {
@@ -98,8 +102,10 @@ impl Packet {
 		self.0.stream_index as usize
 	}
 
-	pub fn set_stream(&mut self, index: usize) {
+	pub fn set_stream(&mut self, index: usize) -> &mut Self {
 		self.0.stream_index = index as c_int;
+
+		self
 	}
 
 	pub fn pts(&self) -> Option<i64> {

src/codec/subtitle/mod.rs

@@ -69,24 +69,30 @@ impl Subtitle {
 		}
 	}
 
-	pub fn set_pts(&mut self, value: Option<i64>) {
+	pub fn set_pts(&mut self, value: Option<i64>) -> &mut Self {
 		self.0.pts = value.unwrap_or(AV_NOPTS_VALUE);
+
+		self
 	}
 
 	pub fn start(&self) -> u32 {
 		self.0.start_display_time as u32
 	}
 
-	pub fn set_start(&mut self, value: u32) {
+	pub fn set_start(&mut self, value: u32) -> &mut Self {
 		self.0.start_display_time = value as uint32_t;
+
+		self
 	}
 
 	pub fn end(&self) -> u32 {
 		self.0.end_display_time as u32
 	}
 
-	pub fn set_end(&mut self, value: u32) {
+	pub fn set_end(&mut self, value: u32) -> &mut Self {
 		self.0.end_display_time = value as uint32_t;
+
+		self
 	}
 
 	pub fn rects(&self) -> RectIter {

src/filter/context/context.rs

@@ -2,7 +2,7 @@ use std::marker::PhantomData;
 
 use ffi::*;
 use libc::c_void;
-use ::{option, format, Error, ChannelLayout};
+use ::{option, format, ChannelLayout};
 use super::{Source, Sink};
 
 pub struct Context<'a> {
@@ -38,20 +38,28 @@ impl<'a> Context<'a> {
 		}
 	}
 
-	pub fn set_pixel_format(&mut self, value: format::Pixel) -> Result<(), Error> {
-		option::Settable::set::<AVPixelFormat>(self, "pix_fmts", &value.into())
+	pub fn set_pixel_format(&mut self, value: format::Pixel) -> &mut Self {
+		let _ = option::Settable::set::<AVPixelFormat>(self, "pix_fmts", &value.into());
+
+		self
 	}
 
-	pub fn set_sample_format(&mut self, value: format::Sample) -> Result<(), Error> {
-		option::Settable::set::<AVSampleFormat>(self, "sample_fmts", &value.into())
+	pub fn set_sample_format(&mut self, value: format::Sample) -> &mut Self {
+		let _ = option::Settable::set::<AVSampleFormat>(self, "sample_fmts", &value.into());
+
+		self
 	}
 
-	pub fn set_sample_rate(&mut self, value: u32) -> Result<(), Error> {
-		option::Settable::set(self, "sample_rates", &(value as i64))
+	pub fn set_sample_rate(&mut self, value: u32) -> &mut Self {
+		let _ = option::Settable::set(self, "sample_rates", &(value as i64));
+
+		self
 	}
 
-	pub fn set_channel_layout(&mut self, value: ChannelLayout) -> Result<(), Error> {
-		option::Settable::set(self, "channel_layouts", &value.bits())
+	pub fn set_channel_layout(&mut self, value: ChannelLayout) -> &mut Self {
+		let _ = option::Settable::set(self, "channel_layouts", &value.bits());
+
+		self
 	}
 }
 

src/filter/context/sink.rs

@@ -32,9 +32,11 @@ impl<'a> Sink<'a> {
 		}
 	}
 
-	pub fn set_frame_size(&mut self, value: u32) {
+	pub fn set_frame_size(&mut self, value: u32) -> &mut Self {
 		unsafe {
 			av_buffersink_set_frame_size(self.ctx.as_mut_ptr(), value);
 		}
+
+		self
 	}
 }

src/format/context/input.rs

@@ -49,12 +49,6 @@ impl Input {
 		}
 	}
 
-	pub fn set_video_codec(&mut self, mut value: Codec) {
-		unsafe {
-			av_format_set_video_codec(self.as_mut_ptr(), value.as_mut_ptr());
-		}
-	}
-
 	pub fn audio_codec(&self) -> Option<Codec> {
 		unsafe {
 			let ptr = av_format_get_audio_codec(self.as_ptr());
@@ -68,12 +62,6 @@ impl Input {
 		}
 	}
 
-	pub fn set_audio_codec(&mut self, mut value: Codec) {
-		unsafe {
-			av_format_set_audio_codec(self.as_mut_ptr(), value.as_mut_ptr());
-		}
-	}
-
 	pub fn subtitle_codec(&self) -> Option<Codec> {
 		unsafe {
 			let ptr = av_format_get_subtitle_codec(self.as_ptr());
@@ -87,12 +75,6 @@ impl Input {
 		}
 	}
 
-	pub fn set_subtitle_codec(&mut self, mut value: Codec) {
-		unsafe {
-			av_format_set_subtitle_codec(self.as_mut_ptr(), value.as_mut_ptr());
-		}
-	}
-
 	pub fn data_codec(&self) -> Option<Codec> {
 		unsafe {
 			let ptr = av_format_get_data_codec(self.as_ptr());
@@ -106,12 +88,6 @@ impl Input {
 		}
 	}
 
-	pub fn set_data_codec(&mut self, mut value: Codec) {
-		unsafe {
-			av_format_set_data_codec(self.as_mut_ptr(), value.as_mut_ptr());
-		}
-	}
-
 	pub fn probe_score(&self) -> i32 {
 		unsafe {
 			av_format_get_probe_score(self.as_ptr())

src/format/context/output.rs

@@ -83,10 +83,12 @@ impl Output {
 		}
 	}
 
-	pub fn set_metadata(&mut self, dictionary: Dictionary) {
+	pub fn set_metadata(&mut self, dictionary: Dictionary) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).metadata = dictionary.disown();
 		}
+
+		self
 	}
 }
 

src/format/stream/stream_mut.rs

@@ -29,16 +29,20 @@ impl<'a> StreamMut<'a> {
 }
 
 impl<'a> StreamMut<'a> {
-	pub fn set_time_base<R: Into<Rational>>(&mut self, value: R) {
+	pub fn set_time_base<R: Into<Rational>>(&mut self, value: R) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).time_base = value.into().into();
 		}
+
+		self
 	}
 
-	pub fn set_frame_rate<R: Into<Rational>>(&mut self, value: R) {
+	pub fn set_frame_rate<R: Into<Rational>>(&mut self, value: R) -> &mut Self {
 		unsafe {
 			av_stream_set_r_frame_rate(self.as_mut_ptr(), value.into().into());
 		}
+
+		self
 	}
 }
 

src/util/frame/audio.rs

@@ -19,9 +19,9 @@ impl Audio {
 
 	#[inline]
 	pub unsafe fn alloc(&mut self, format: format::Sample, samples: usize, layout: ChannelLayout) {
-		self.set_format(format);
-		self.set_samples(samples);
-		self.set_channel_layout(layout);
+		self.set_format(format)
+		    .set_samples(samples)
+		    .set_channel_layout(layout);
 
 		av_frame_get_buffer(self.as_mut_ptr(), 0);
 	}
@@ -58,10 +58,12 @@ impl Audio {
 	}
 
 	#[inline]
-	pub fn set_format(&mut self, value: format::Sample) {
+	pub fn set_format(&mut self, value: format::Sample) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).format = mem::transmute::<AVSampleFormat, c_int>(value.into());
 		}
+
+		self
 	}
 
 	#[inline]
@@ -72,10 +74,12 @@ impl Audio {
 	}
 
 	#[inline]
-	pub fn set_channel_layout(&mut self, value: ChannelLayout) {
+	pub fn set_channel_layout(&mut self, value: ChannelLayout) -> &mut Self {
 		unsafe {
 			av_frame_set_channel_layout(self.as_mut_ptr(), value.bits() as int64_t);
 		}
+
+		self
 	}
 
 	#[inline]
@@ -86,10 +90,12 @@ impl Audio {
 	}
 
 	#[inline]
-	pub fn set_channels(&mut self, value: u16) {
+	pub fn set_channels(&mut self, value: u16) -> &mut Self {
 		unsafe {
 			av_frame_set_channels(self.as_mut_ptr(), value as c_int);
 		}
+
+		self
 	}
 
 	#[inline]
@@ -100,10 +106,12 @@ impl Audio {
 	}
 
 	#[inline]
-	pub fn set_rate(&mut self, value: u32) {
+	pub fn set_rate(&mut self, value: u32) -> &mut Self {
 		unsafe {
 			av_frame_set_sample_rate(self.as_mut_ptr(), value as c_int);
 		}
+
+		self
 	}
 
 	#[inline]
@@ -114,10 +122,12 @@ impl Audio {
 	}
 
 	#[inline]
-	pub fn set_samples(&mut self, value: usize) {
+	pub fn set_samples(&mut self, value: usize) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).nb_samples = value as c_int;
 		}
+
+		self
 	}
 
 	#[inline]

src/util/frame/mod.rs

@@ -85,10 +85,12 @@ impl Frame {
 		}
 	}
 
-	pub fn set_pts(&mut self, value: Option<i64>) {
+	pub fn set_pts(&mut self, value: Option<i64>) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).pts = value.unwrap_or(AV_NOPTS_VALUE);
 		}
+
+		self
 	}
 
 	pub fn timestamp(&self) -> Option<i64> {
@@ -118,10 +120,12 @@ impl Frame {
 		}
 	}
 
-	pub fn set_metadata(&mut self, value: Dictionary) {
+	pub fn set_metadata(&mut self, value: Dictionary) -> &mut Self {
 		unsafe {
 			av_frame_set_metadata(self.as_mut_ptr(), value.disown());
 		}
+
+		self
 	}
 
 	pub fn side_data(&self, kind: side_data::Type) -> Option<SideData> {

src/util/frame/video.rs

@@ -22,9 +22,9 @@ impl Video {
 
 	#[inline]
 	pub unsafe fn alloc(&mut self, format: format::Pixel, width: u32, height: u32) {
-		self.set_format(format);
-		self.set_width(width);
-		self.set_height(height);
+		self.set_format(format)
+		    .set_width(width)
+		    .set_height(height);
 
 		av_frame_get_buffer(self.as_mut_ptr(), 32);
 	}
@@ -61,10 +61,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_format(&mut self, value: format::Pixel) {
+	pub fn set_format(&mut self, value: format::Pixel) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).format = mem::transmute::<AVPixelFormat, c_int>(value.into());
 		}
+
+		self
 	}
 
 	#[inline]
@@ -75,10 +77,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_kind(&mut self, value: picture::Type) {
+	pub fn set_kind(&mut self, value: picture::Type) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).pict_type = value.into();
 		}
+
+		self
 	}
 
 	#[inline]
@@ -110,10 +114,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_width(&mut self, value: u32) {
+	pub fn set_width(&mut self, value: u32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).width = value as c_int;
 		}
+
+		self
 	}
 
 	#[inline]
@@ -124,10 +130,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_height(&mut self, value: u32) {
+	pub fn set_height(&mut self, value: u32) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).height = value as c_int;
 		}
+
+		self
 	}
 
 	#[inline]
@@ -138,10 +146,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_color_space(&mut self, value: color::Space) {
+	pub fn set_color_space(&mut self, value: color::Space) -> &mut Self {
 		unsafe {
 			av_frame_set_colorspace(self.as_mut_ptr(), value.into());
 		}
+
+		self
 	}
 
 	#[inline]
@@ -152,10 +162,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_color_range(&mut self, value: color::Range) {
+	pub fn set_color_range(&mut self, value: color::Range) -> &mut Self {
 		unsafe {
 			av_frame_set_color_range(self.as_mut_ptr(), value.into());
 		}
+
+		self
 	}
 
 	#[inline]
@@ -166,10 +178,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_color_primaries(&mut self, value: color::Primaries) {
+	pub fn set_color_primaries(&mut self, value: color::Primaries) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).color_primaries = value.into();
 		}
+
+		self
 	}
 
 	#[inline]
@@ -180,10 +194,12 @@ impl Video {
 	}
 
 	#[inline]
-	pub fn set_color_transfer_characteristic(&mut self, value: color::TransferCharacteristic) {
+	pub fn set_color_transfer_characteristic(&mut self, value: color::TransferCharacteristic) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).color_trc = value.into();
 		}
+
+		self
 	}
 
 	#[inline]