diff --git a/examples/ffmpeg_recorder.rs b/examples/ffmpeg_recorder.rs
index d7df52d..f95936e 100644
--- a/examples/ffmpeg_recorder.rs
+++ b/examples/ffmpeg_recorder.rs
@@ -13,7 +13,7 @@ use ferretro::retro;
 use ferretro::retro::ffi::{PixelFormat, GameGeometry, SystemAvInfo, SystemInfo};
 use ferretro::retro::wrapper::{LibretroWrapper, Handler};
 
-use ffmpeg::{ChannelLayout, Packet, filter, format, frame, media};
+use ffmpeg::{ChannelLayout, Packet, codec, filter, format, frame, media};
 use ffmpeg::util::rational::Rational;
 
 struct MyEmulator {
@@ -77,7 +77,7 @@ fn video_filter(
 }
 
 fn audio_filter(
-    audio_encoder: &ffmpeg::encoder::audio::Audio,
+    audio_encoder: &ffmpeg::codec::encoder::Audio,
     sample_rate: f64,
 ) -> Result<filter::Graph, ffmpeg::Error> {
     let mut afilter = filter::Graph::new();
@@ -99,6 +99,21 @@ fn audio_filter(
         .input("out", 0)?
         .parse("anull")?;
     afilter.validate()?;
+    // human-readable filter graph
+    eprintln!("{}", afilter.dump());
+
+    if let Some(codec) = audio_encoder.codec() {
+        if !codec
+            .capabilities()
+            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
+        {
+            afilter
+                .get("out")
+                .unwrap()
+                .sink()
+                .set_frame_size(audio_encoder.frame_size());
+        }
+    }
 
     Ok(afilter)
 }
@@ -129,7 +144,7 @@ impl MyEmulator {
         let mut video_output = octx.add_stream(vcodec).unwrap();
         let mut video_encoder = video_output.codec().encoder().video().unwrap();
 
-        video_encoder.set_bit_rate(64000);
+        video_encoder.set_bit_rate(2560000);
         video_encoder.set_format(video_encoder.codec().unwrap().video().unwrap().formats().unwrap().nth(0).unwrap());
 
         video_encoder.set_time_base(Rational::new(1, fps_int));
@@ -176,10 +191,12 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
         audio_encoder.set_format(audio_encoder.codec().unwrap().audio().unwrap().formats().unwrap().nth(0).unwrap());
         audio_encoder.set_channels(2);
         audio_encoder.set_channel_layout(ChannelLayout::STEREO);
-
-        let audio_filter = audio_filter(&audio_encoder, av_info.timing.sample_rate).unwrap();
+        audio_encoder.set_time_base(Rational::new(1, fps_int));
+        audio_output.set_time_base(Rational::new(1, fps_int));
 
         let mut audio_encoder = audio_encoder.open_as(acodec).unwrap();
+        let audio_filter = audio_filter(&audio_encoder, av_info.timing.sample_rate).unwrap();
+
         audio_encoder.set_rate(av_info.timing.sample_rate.round() as i32);
         audio_output.set_parameters(&audio_encoder);
 
@@ -217,7 +234,7 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
         self.video_filter.get("in").unwrap().source().add(&vframe).unwrap();
         let mut filtered_vframe = frame::Video::empty();
 
-        while self.video_filter.get("out").unwrap().sink().frame(&mut filtered_vframe).is_ok() {
+        while let Ok(..) = self.video_filter.get("out").unwrap().sink().frame(&mut filtered_vframe) {
             if self.video_filter.get("in").unwrap().source().failed_requests() > 0 {
                 println!("🎥 failed to put filter input frame");
             }
@@ -229,24 +246,27 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
                 if encoded_packet.size() > 0 {
                     encoded_packet.set_stream(0); // use stream index...
                     //encoded_packet.rescale_ts(Rational(1, 1), Rational(1, 60));
-                    encoded_packet.write(&mut self.octx).unwrap(); // AAA
+                    encoded_packet.write_interleaved(&mut self.octx).unwrap(); // AAA
                 }
                 //encoded_packet.write_interleaved(&mut self.octx).unwrap(); // AAA
             }
         }
 
+        eprintln!("Audio buffer length {}", self.audio_buf.len());
 
         let mut aframe = frame::Audio::new(
             format::Sample::I16(format::sample::Type::Packed),
             self.audio_buf.len(),
             ChannelLayout::STEREO
         );
+        aframe.set_channels(2);
         aframe.set_rate(32040);
+        aframe.set_pts(Some(frame));
         let aplane: &mut [(i16, i16)] = aframe.plane_mut(0);
         aplane.copy_from_slice(self.audio_buf.as_ref());
+        //eprintln!("src: {:?}, dest: {:?}", self.audio_buf, aplane);
         self.audio_buf.clear();
 
-        let mut out = ffmpeg::Packet::empty();
         self.audio_filter.get("in").unwrap().source().add(&aframe).unwrap();
 
         let mut filtered_aframe = frame::Audio::empty();
@@ -255,13 +275,14 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
                 println!("🎥 failed to put filter input frame");
             }
 
+            filtered_aframe.set_pts(Some(frame));
             self.audio_encoder.send_frame(&aframe).unwrap();
             let mut encoded_packet = ffmpeg::Packet::empty();
             while let Ok(..) = self.audio_encoder.receive_packet(&mut encoded_packet) {
                 if encoded_packet.size() > 0 {
                     encoded_packet.set_stream(1);
                     //encoded_packet.rescale_ts(Rational(1, 1), Rational(1, 60));
-                    encoded_packet.write(&mut self.octx).unwrap(); // AAA
+                    encoded_packet.write_interleaved(&mut self.octx).unwrap(); // AAA
                 }
             }
         }
@@ -283,6 +304,10 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
             .load_game(Some(path), data, None)
             .unwrap();
     }
+
+    pub fn end(&mut self) {
+        self.octx.write_trailer().unwrap();
+    }
 }
 
 impl retro::wrapper::Handler for MyEmulator {
@@ -352,11 +377,9 @@ impl retro::wrapper::Handler for MyEmulator {
         }
 
         self.video_encoder.set_frame_rate(system_av_info.timing.fps.into());
-        /*
         if system_av_info.timing.sample_rate.round() as i32 > 0 {
             self.audio_encoder.set_rate(system_av_info.timing.sample_rate.round() as i32);
         }
-        */
         self.av_info.timing = system_av_info.timing;
         self.set_geometry(system_av_info.geometry);
         true
@@ -431,6 +454,7 @@ fn main() -> Fallible<()> {
     let mut packet = Packet::empty();
     eprintln!("flushed: {:?}", emu.video_encoder.flush(&mut packet).unwrap());
 
+    emu.end();
     //octx.write_trailer().unwrap();
     Ok(())
 }